Chapter 9 Flashcards
LAND AS SOON AS POSSIBLE
is
defined as landing at the nearest suitable landing area (e.g.,
open field) without delay. (The primary consideration is to
ensure the survival of occupants.)
LAND AS SOON AS PRACTICABLE
is
defined as landing at a suitable landing area. (The primary
consideration is the urgency of the emergency.)
AUTOROTATE
is defined as adjusting the
flight controls as necessary to establish an autorotational
descent and landing.
ESTABLISH SINGLE ENGINE AIRSPEED
is defined as maneuvering the aircraft to an appropriate
airspeed that will allow for continued flight under
partial power conditions to a suitable recovery area.
- Cyclic - Adjust as required.
- Collective - Adjust as required to maintain %
RPM R within normal operating range. - Establish appropriate airspeed.
EMER ENG SHUTDOWN
is defined as
engine shutdown without delay. Engine shutdown in flight
is usually not an immediate-action item unless a fire exists.
Before attempting an engine shutdown, identify the affected
engine by checking ENG OUT warnings, % RPM,
% TRQ, ENG OIL PRESS, TGT TEMP, and Ng
SPEED.
- ENG POWER CONT lever(s) - OFF.
- ENG FUEL SYS selector(s) - OFF.
- FUEL BOOST PUMP CONTROL
switch(es) - OFF.
EMER ENG SHUTDOWN (CAUTION)
I f TGT r i s e s above 538°C a f t e r shutdown, place AIR SOURCE HEAT/ START switch as required, turn ENGINE IGNITION switch OFF, and press starter to motor engine for 30 seconds or until TGT decreases below 538°C.
LOCKOUT
is defined as manual control of
engine RPM while bypassing 700 ECU, or 701C
701D/CC DEC/EDECU functions. Bypass of the engine
control will be required when % RPM 1 or 2 decreases
below normal demand speed due to a malfunction of the
ECU/DEC/EDECU.
ENG POWER CONT lever - Pull down and advance
full forward while maintaining downward pressure, then
adjust to set % RPM R as required. Engine control
malfunctions can result in % RPM R increasing or
decreasing from normal demand speed. Under certain
failure conditions, % TRQ, % RPM, and Ng SPEED
may not be indicating and the possibility of the ENG OUT
warning and audio activating exists. The most reliable
indication of engine power will be TGT TEMP.
LOCKOUT (WARNING / CAUTION)
WARNING: Going to ECU/DEC/EDECU LOCKOUT to obtain additional power does not remove Maximum Fuel Flow or Ng limits. % RPM R will decrease below normal operating range if Maximum Fuel Flow or Ng limits are exceeded
CAUTION: When engine is controlled with ENG POWER CONT lever in LOCKOUT, engine response is much faster and TGT limiting system is inoperative. Care must be taken not to exceed TGT limits and keeping % RPM R and % RPM 1 and 2 in operating range.
EMER APU START
is defined as APU
start to accomplish an emergency procedure.
- FUEL PUMP switch - APU BOOST.
- APU CONTR switch - ON.
CAUTION: Ensure that the mask blowers are disconnected and position the BCA MCU control knobs to OFF prior to switching from main power to APU power.
Emergency Exits (Warning)
Warning: For helicopters with a non-operational roll-trim actuator, the cyclic shall be continuously held while on the ground with rotor turning. In cases where emergency exit is required prior to rotor coasting to a stop, make sure that the cyclic stick is centered until the last crewmember can depart the cockpit. Since the main rotor shaft has a 3° forward tilt, an exit to the right rear or left rear will provide the greatest rotor clearance safety.
Engine Malfunctions (Warning x2)
Warning: Single engine capability must be considered prior to movement of the engine power control lever. Prior to movement of either power-control lever, it is imperative that the malfunctioning engine and the corresponding powercontrol lever be identified. If the decision is made to shut down an engine, take at least five full seconds while retarding the ENG POWER CONT lever from FLY to IDLE, monitoring % TRQ, Ng SPEED, TGT TEMP, % RPM, and ENG OUT warning appearance.
Significant rotor droop that results in the
generators dropping off line or a dual
generator or converter failure will result
in a partial power loss. This power loss
will be due to the opening of engine antiice
valves and will result in a further
reduction of maximum torque available
by 700 16% or 701C 701D/CC
18%.
Single Engine Failure (Warning x2)
When the power available during single engine operation is marginal or less, consideration should be given to jettisoning the external stores. The engine antiice and cockpit heater switches should be turned off as necessary to ensure maximum power is available on the remaining engine.
(2) Do not respond to ENG OUT warning
and audio until checking TGT TEMP, Ng
SPEED, and % RPM 1 and 2.
Single Engine Failure
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- External cargo/stores - Jettison (if required).
If continued flight is not possible: - LAND AS SOON AS POSSIBLE.
If continued flight is possible: - LAND AS SOON AS PRACTICABLE
Engine Restart During Flight
After an engine failure in flight, an engine restart may
be attempted. If it can be determined that it is reasonably
safe to attempt a start, the APU should be used. Use of a
crossbleed start could result in a power loss of up to 18%
TRQ on the operational engine.
Dual Engine Failure
AUTOROTATE.
Warning:
Do not respond to ENG OUT warnings
and audio until checking TGT TEMP
and % RPM R.
ECU/DEC/EDECU Low Side Failure
1. ESTABLISH SINGLE-ENGINE AIRSPEED. If partial powered flight cannot be maintained: 2. ENG POWER CONT lever (low % TRQ/ TGT TEMP engine) - LOCKOUT. Maintain % TRQ approximately 10% below other engine. 3. LAND AS SOON AS PRACTICABLE.
ECU/DEC/EDECU Low Side Failure (Warning / Caution / Note)
Warning: Going to ECU/DEC/EDECU LOCKOUT to obtain additional power does not remove Maximum Fuel Flow or Ng limits. % RPM R will decrease below normal operating range if Maximum Fuel Flow or Ng limits are exceeded.
Caution: When engine is controlled with ENG POWER CONT lever in LOCKOUT, engine response is much faster and the TGT limiting system is inoperative. Care must be taken not to exceed TGT limits and keeping % RPM R and % RPM 1 and 2 in operating range.
Note: If %RPM R reduces from 100% to 95-96% during steady flight, check %TRQ 1 and 2. If %TRQ 1 and 2 are equal and below Maximum Torque Available, attempt to increase %RPM R with ENG RPM trim switch.
ECU/DEC/EDECU High Side Failure
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- ENG POWER CONT lever (high % TRQ/
TGT TEMP engine) - Retard. Maintain %
TRQ approximately 10% below other engine. - LAND AS SOON AS PRACTICABLE.
If the affected engine does not respond to ENG
POWER CONT lever movement in the range between
FLY and IDLE, the HMU may be malfunctioning
internally.
If this occurs: - Perform EMER ENG SHUTDOWN (affected
engine). - Refer to single-engine failure emergency procedure
% RPM Increasing/Decreasing (Oscillation)
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- Slowly retard the ENG POWER CONT lever
on the suspected engine.
If the oscillation stops and partial power flight cannot
be maintained: - Place that engine in LOCKOUT and manually
control the power. - LAND AS SOON AS PRACTICABLE.
If the oscillation continues: - Place the ENG POWER CONT lever back to
FLY and retard the ENG POWER CONT
lever of the other engine.
If partial power flight cannot be maintained: - Place the engine in LOCKOUT, manually
control the power. - LAND AS SOON AS PRACTICABLE.
% TRQ Split Between Engines 1 & 2
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- If TGT TEMP of one engine exceeds the
limiter ( 700 850°C, 701C 701D/CC
875°C with low power engine above 50%
TRQ or 901°C with low power engine below
50% TRQ), retard ENG POWER CONT
lever on that engine to reduce TGT TEMP.
Retard the ENG POWER CONT lever to
maintain torque of the manually controlled
engine at approximately 10% below the other
engine. - If TGT TEMP limit on either engine is not
exceeded, slowly retard ENG POWER
CONT lever on high % TRQ engine and
observe % TRQ of low power engine. - If % TRQ of low power engine increases,
ENG POWER CONT lever on high power
engine - Retard to maintain % TRQ approximately
10% below other engine (the high
power engine has been identified as a high side
failure). - If % TRQ of low power engine does not
increase, or % RPM R decreases, ENG
POWER CONT lever - Return high power
engine to FLY (the low power engine has been
identified as a low side failure). - If additional power is required, low power
ENG POWER CONT lever, momentarily move to LOCKOUT and adjust to set %
TRQ approximately 10% below the other
engine. - LAND AS SOON AS PRACTICABLE.
Load Demand System Malfunction
On ground : ENG POWER CONT in IDLE Ng 3% to 4% higher than normal. ENG POWER CONT in FLY Torque split (single engine malfunction). In flight : Initial takeoff (during collective increase). Increased torque split (single engine malfunction). Low power descent (lowering collective to minimum) Rapid rise in engine %RPM and %RPM R.
Engine Compressor Stall
- ESTABLISH SINGLE-ENGINE AIRSPEED.
If condition persists: - ENG POWER CONT lever (affected engine)
- Retard (TGT TEMP should decrease). - ENG POWER CONT lever (affected engine)
- FLY.
If stall condition recurs: - EMER ENG SHUTDOWN (affected engine).
- Refer to single-engine failure emergency procedure.
#1 OIL FLTR BYPASS OR #2 OIL FLTR BYPASS CAUTION APPEARS
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- ENG POWER CONT lever (affected engine)
- Retard (to reduce pressure). - LAND AS SOON AS PRACTICABLE.
CHIP #1 ENGINE OR CHIP #2 ENGINE, #1
ENGINE OIL PRESS OR #2 ENGINE OIL PRESS,
#1 ENGINE OIL TEMP OR #2 ENGINE OIL TEMP
CAUTION APPEARS.
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- ENG POWER CONT lever (affected engine)
- Retard (to reduce torque).
If oil pressure is below minimum limits or if oil temperature
remains above maximum limits: - EMER ENG SHUTDOWN (affected engine).
- Refer to single engine failure emergency procedure.
ENGINE HIGH-SPEED SHAFT FAILURE.
Failure of the shaft may be complete or partial. A
partial failure may be characterized at first by nothing
more than a loud high-speed rattle and vibration coming
from the engine area. A complete failure will be accompanied
by a loud bang that will result in a sudden %
TRQ decrease to zero on the affected engine. % RPM of
affected engine will increase until overspeed system is
activated.
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- EMER ENG SHUTDOWN (affected engine).
Do not attempt to restart. - Refer to single-engine failure emergency procedure
LIGHTNING STRIKE
Lightning strike may cause one or both engines to immediately
produce maximum power with no TGT limiting
or overspeed protection. Systems instruments may also be
inoperative. If this occurs, the flight crew would have to
adjust to the malfunctioning engine(s) ENG POWER
CONT lever(s) as required to control % RPM by sound
and feel. If practical, the pilot should reduce speed to 80
KIAS. This will reduce the criticality of having exactly
correct rotor speed 100%.
- ESTABLISH SINGLE-ENGINE AIRSPEED.
- ENG POWER CONT levers - Adjust as
required to control % RPM. - LAND AS SOON AS POSSIBLE
Lightning Strike (Warning)
Lightning strikes may result in loss of
automatic flight control functions, engine
controls, and/or electric power.
Loss of Tail Rotor Thrust in Cruise Flight
If autorotation entry is delayed, large sideslip angles can
develop causing low indicated airspeed with the stabilator
programming down. This will make it more difficult to
establish or maintain adequate autorotative airspeed.
1. AUTOROTATE - Maintain airspeed at or above 80 KIAS. 2. ENG POWER CONT levers - OFF (during deceleration when intended point of landing is assured).
Loss of Tail Rotor Thrust or TAIL ROTOR
QUADRANT Caution Appears with Loss of Control
at Low Airspeed/Hover (Right Rotation)
- Collective - Reduce.
- ENG POWER CONT levers - OFF (5 to 10
feet above touchdown).
TAIL ROTOR QUADRANT Caution Appears
in Cruise Flight.
- Collective - Adjust to determine controllability
(Fixed Right or Left). - LAND AS SOON AS PRACTICABLE.
TAIL ROTOR QUADRANT Caution Appears
in Cruise Flight. (Warning)
Warning: If the helicopter is shut down and/or hydraulic power is removed with one tail rotor cable failure, disconnection of the other tail rotor cable will occur when force from the boost servo cannot react against control cable quadrant spring tension. The quadrant spring will displace the cable and boost servo piston enough to unlatch the quadrant cable.
Loss of Control at Low Airspeed/Hover or
TAIL ROTOR QUADRANT Caution Appears (Left
Rotation).
1. ENG POWER CONT lever(s) - Retard to decrease %RPM R below 100% and begin a partial power descent. 2. Collective - Adjust to preserve %RPM R. 3. ENG POWER CONT levers - OFF (5 to 10 feet above touchdown). 4. Collective - Adjust for landing.
Loss of Control at Low Airspeed/Hover or
TAIL ROTOR QUADRANT Caution Appears (Left
Rotation). (Warning)
Warning:
Reducing collective in a left rotation will
increase rate of turn with the ENG
POWER CONT lever(s) at fly depending
on the rate at which the ENG POWER
CONT lever(s) are retarded. It is critical
that the pilot on the controls maintain a
level attitude, preserve RPM R, and apply
cushion for the landing.
Pedal Bind/Restriction or Drive With No
Accompanying Caution.
- Apply pedal force to oppose the drive.
- Check other pedals for proper operation.
- TAIL SERVO switch - BACKUP.
If normal control authority is not restored: - TAIL SERVO switch - NORMAL
- BOOST switch - OFF.
If normal control forces are not restored: - BOOST switch - ON.
- Collective - Adjust to determine controllability
for landing. - LAND AS SOON AS PRACTICABLE.
#1 TAIL RTR SERVO Caution Appears and BACK-UP PUMP ON Advisory Does Not Appear or #2 TAIL RTR SERVO ON Advisory Does Not Appear
- TAIL SERVO switch - BACKUP.
- BACKUP HYD PUMP switch - ON.
- LAND AS SOON AS PRACTICABLE
MAIN XMSN OIL PRESS or MAIN XMSN OIL
TEMP Caution Appears / XMSN OIL PRESS LOW /
XMSN OIL TEMP HIGH
1. LAND AS SOON AS POSSIBLE. If time permits: 2. Slow to 80 KIAS. 3. EMER APU START. 4. GENERATORS NO. 1 and NO. 2 switches - OFF.
CHIP INPUT MDL LH or RH Caution Appears.
ESTABLISH SINGLE-ENGINE AIRSPEED.
- ENG POWER CONT lever (affected engine)
- IDLE. - LAND AS SOON AS POSSIBLE.
CHIP MAIN MDL SUMP, CHIP ACCESS
MDL LH or RH, CHIP TAIL XMSN or CHIP INT
XMSN/TAIL XMSN OIL TEMP or INT XMSN OIL
TEMP Caution Appears.
LAND AS SOON AS POSSIBLE.
Main Transmission Failure.
Decreasing % RPM R may be a c -
companied by a drop in transmission oil
pressure of 10 psi or more, and possible
unusual helicopter vibrations.
1. Collective - Adjust only enough to begin a
descent with power remaining applied to the
main transmission throughout the descent and
landing.
2. LAND AS SOON AS POSSIBLE.
Main Transmission Failure. (Warning)
Warning: If % RPM R decreases from 100% to below 96% with an increase in torque during steady flight with no engine malfunction, the main transmission planetary carrier may have failed. During a main transmission planetary carrier failure, it may be impossible to maintain % RPM R at 100%.
FIRE-General (Warning)
Warning: If No. 2 dc primary bus electrical power is not available, only the reserve fire bottle can be discharged and fire extinguishing capability for the #2 engine will be lost.
Engine Fire In Flight.
ESTABLISH SINGLE-ENGINE AIRSPEED. 2. ENG POWER CONT lever - OFF (affected engine). 3. ENG EMER OFF handle - Pull. 4. FIRE EXTGH switch - MAIN/RESERVE as required. 5. LAND AS SOON AS POSSIBLE.
Engine Fire In Flight. (Warning)
Attempt to visually confirm fire before
engine shutdown or discharging
extinguishing agent.
Engine/Fuselage Fire On Ground.
- ENG POWER CONT lever(s) - OFF.
- ENG EMER OFF handle(s) - Pull if applicable.
- FIRE EXTGH switch - MAIN/RESERVE as
required.
APU Compartment Fire.
- APU fire T-handle - Pull.
- FIRE EXTGH switch - MAIN/RESERVE as
required.
APU OIL TEMP HI Caution Appears.
APU CONTR switch - OFF. Do not attempt
restart until oil level has been checked.
Electrical Fire In Flight
Prior to shutting off
all electrical power, the pilot must consider the equipment
that is essential to a particular flight environment which
will be affected, e.g., flight instruments, flight controls, etc.
If a landing cannot be made as soon as possible, the affected
circuit may be isolated by selectively turning off
electrical equipment and/or pulling circuit breakers.
- BATT and GENERATORS switches - OFF.
- LAND AS SOON AS POSSIBLE
SMOKE AND FUME ELIMINATION.
Smoke or fumes in the cockpit/cabin can be eliminated
as follows:
1. Airspeed - 80 KIAS or less.
2. Cabin doors and gunner’s windows - Open.
3. Place helicopter out of trim.
4. LAND AS SOON AS PRACTICABLE
SMOKE AND FUME ELIMINATION. (Warning)
Warning: If battery overheats, do not remove battery cover or attempt to disconnect or remove battery. Battery fluid will cause burns, and an overheated battery could cause thermal burns and may explode.
1 or #2 FUEL FLTR BYPASS Caution Appears.
- ENG FUEL SYS selector on affected engine -
XFD. - LAND AS SOON AS PRACTICABLE
#1 and #2 FUEL FLTR BYPASS Cautions Appear.
LAND AS SOON AS POSSIBLE.
#1 FUEL LOW and #2 FUEL LOW Cautions Appear.
LAND AS SOON AS PRACTICABLE
1 or #2 FUEL PRESS Caution Appears.
a. If the caution appears, flameout is possible. Do not
make rapid collective movements. Critical situations are
those where single engine flight is not possible, and the
potential for fire resulting from a fuel leak is secondary to
engine flameout.
If the caution appears and the situation is critical:
1. ENG FUEL SYS selector on affected engine -
XFD.
2. FUEL BOOST PUMP CONTROL switch on
side being used - ON.
3. LAND AS SOON AS POSSIBLE.
4. EMER ENG SHUTDOWN after landing.
b. Non-critical situations are those where single engine
flight is possible.
If the caution appears, and the situation is not critical:
1. ENG FUEL SYS selector on affected engine -
XFD.
2. FUEL BOOST PUMP CONTROL switches
- NO. 1 PUMP or NO. 2 PUMP - OFF (As
applicable).
3. LAND AS SOON AS PRACTICABLE.
1 or #2 FUEL PRESS Caution Appears (Warning)
Consideration must be given to any suspected fuel system compromise. If a compromise is suspected, the pilot must make every attempt to avoid or reduce the possibility of an ignition source. A fuel leak occurring in the oil cooler access area may result in fuel and/or fumes accumulating in or around the APU/engine compartments. In such cases, APU/engine operation may result in fire.
1 and #2 FUEL PRESS Cautions Appear (Warning)
If both the #1 and #2 FUEL PRESS cautions appear, flameout is possible. Do not make rapid collective movements. Landing the aircraft as soon as possible is crucial. The possibilility of a fuel leak may result in a fire; therefore, both engines should be shut down immediately after landing.
1 and #2 FUEL PRESS Cautions Appear.
- LAND AS SOON AS POSSIBLE.
2. EMER ENG SHUTDOWN after landing.
9.26.1 #1 and #2 Generator Failure (#1 and #2
CONV and AC ESS BUS OFF Cautions Appear). (Warning)
Warning: Following the loss of DC PRI 1 and 2 bus power, both engine anti-ice valves will open, resulting in a further reduction of maximum torque available by 700 16% or 701C 701D/CC 18%.
#1 and #2 Generator Failure (#1 and #2 CONV and AC ESS BUS OFF Cautions Appear).
- SAS 1 switch - Press off.
- Airspeed - Adjust (80 KIAS or less).
- GENERATORS NO. 1 and NO. 2 switches -
RESET; then ON.
If cautions still appear: - GENERATORS NO. 1 and NO. 2 switches -
OFF. - If MCUs are in use: BCA MCU control knobs
(pilot, copilot, and crewmembers) - OFF. - EMER APU START.
- SAS 1 switch - ON.
- LAND AS SOON AS PRACTICABLE
1 or #2 GEN Caution Appears (Caution)
Caution: When the #1 ac generator is failed, and the backup pump circuit breaker is out, turn off ac electrical power before resetting the backup pump power circuit breaker, to avoid damaging the current limiters.
1 or #2 GEN Caution Appears.
- Affected GENERATORS switch - RESET;
then ON.
If caution still appears: - Affected GENERATORS switch - OFF.
1 and #2 CONV Cautions Appear (Warning)
Following the loss of DC PRI 1 and 2 bus power, both engine anti-ice valves will open, resulting in a further reduction of maximum torque available by 700 16% or 701C 701D/CC 18%.
1 and #2 CONV Cautions Appear.
- Unnecessary dc electrical equipment - OFF.
NOTE
When only battery power is available, NICAD
battery life is about 22 minutes day
and 14 minutes night for a battery 80%
charged. SLAB battery life is about 38
minutes day and 24 minutes night for a battery
80% charged. - LAND AS SOON AS PRACTICABLE.
BATTERY FAULT Caution Appears.
1. BATT switch - OFF; then ON. If BATTERY FAULT caution appears, cycle BATT switch no more than two times. If caution still appears: 2. BATT switch - OFF.
BATT LOW CHARGE Caution Appears.
If caution appears after ac power is applied:
1. BATT switch - OFF; then ON. About 30
minutes may be required to recharge battery.
If caution appears in flight:
2. BATT switch - OFF, to conserve remaining
battery charge.
LFT or RT PITOT HEAT and MASTER Cautions
Appear or Are Flashing. (Caution x2)
Caution: (1) LFT or RT PITOT HEAT and MASTER cautions appearing, with the PITOT HEAT switch in the OFF position, indicates complete failure of 5 Vdc power in the corresponding left or right relay panel. Do not fly the helicopter.
(2) Flashing LFT or RT PITOT HEAT and MASTER cautions indicates a failure of a 5 Vdc power supply in the corresponding solid state left or right relay panel. Do not fly the helicopter.
LFT or RT PITOT HEAT and MASTER Cautions
Appear or Are Flashing.
If LFT or RT PITOT HEAT and MASTER cautions
are flashing:
1. LAND AS SOON AS PRACTICABLE.
If LFT or RT PITOT HEAT and MASTER cautions
appear steady:
1. Turn off applicable PITOT HEAT switch.
If caution disappears, then applicable pitot heat has
failed:
2. Exit icing conditions.
If LFT or RT PITOT HEAT and MASTER cautions
still appear:
3. Set PITOT HEAT switch as needed.
4. LAND AS SOON AS POSSIBLE.
1 HYD PUMP Caution Appears
- TAIL SERVO switch - BACKUP; then
NORMAL. - LAND AS SOON AS PRACTICABLE.
2 HYD PUMP Caution Appears.
- POWER ON RESET switches - Simultaneously
press, then release. - LAND AS SOON AS PRACTICABLE.
1 and #2 HYD PUMP Cautions Appear.
LAND AS SOON AS POSSIBLE. Restrict
control movement to moderate rates.
#1 or #2 HYD PUMP Caution Appears and BACK-UP PUMP ON Advisory Does Not Appear.
Loss of both the No. 1 hydraulic pump and backup pump
results in both stages of the tail-rotor servo being unpressurized.
The yaw boost servo is still pressurized and the
mechanical control system is still intact allowing limited
tail-rotor control. Because of the limited yaw control range
available, a roll-on landing at approximately 40 KIAS is
required. Loss of both the No. 2 hydraulic pump and the
backup pump results in the loss of pilot-assist servos.
- Airspeed - Adjust to a comfortable airspeed.
- BACKUP HYD PUMP switch - ON.
If BACK-UP PUMP ON advisory appears: - Refer to #1 HYD PUMP or #2 HYD PUMP
caution appears emergency procedure.
If BACK-UP PUMP ON advisory still does not
appear: - FPS and BOOST switches - Off (for #2 HYD
PUMP caution). - LAND AS SOON AS POSSIBLE.
1 or #2 PRI SERVO PRESS Caution Appears.
Appearance of #1 or #2 PRI SERVO PRESS
caution can be caused by inadvertently placing the SVO
OFF switch on either collective control head in 1ST STG
or 2ND STG position. Before initiating emergency procedure
action, the pilots should check that both SVO OFF
switches are centered.
1. SVO OFF switches - Check both are centered.
2. If the caution appears with the SVO OFF
switch centered, move the SVO OFF switch to
turn off the malfunctioning servo.
3. LAND AS SOON AS POSSIBLE.
#1 RSVR LOW and #1 HYD PUMP Cautions Appear With BACK-UP PUMP ON Advisory Appearing.
- LAND AS SOON AS PRACTICABLE.
If the BACK-UP RSVR LOW caution also appears: - SVO OFF switch - 1ST STG.
- LAND AS SOON AS POSSIBLE.
#1 RSVR LOW and #1 HYD PUMP Cautions Appear With BACK-UP PUMP ON Advisory Appearing. (Warning)
Warning: If #2 PRI SERVO PRESS caution appears, establish landing attitude, minimize control inputs, and begin a descent.
#2 RSVR LOW and #2 HYD PUMP Cautions Appear With BACK-UP PUMP ON Advisory Appearing.
1. POWER ON RESET s w i t c h e s - Simultaneously press then release. 2. LAND AS SOON AS PRACTICABLE. If BACK-UP RSVR LOW caution also appears: 3. SVO OFF switch - 2ND STG. 4. LAND AS SOON AS POSSIBLE.
#2 RSVR LOW and #2 HYD PUMP Cautions Appear With BACK-UP PUMP ON Advisory Appearing. (Warning)
If #1 PRI SERVO PRESS caution appears,
establish landing attitude,
minimize control inputs, and begin a
descent.
2 RSVR LOW Caution Appears.
Pilot assist servos will be isolated; if they remain isolated, proceed as follows: 1. BOOST - Off. 2. FPS - Off. 3. LAND AS SOON AS PRACTICABLE.
2 RSVR LOW Caution Appears. (Note)
Note: Because the logic module will close the valve supplying pressure to the pilot-assist servos, BOOST SERVO OFF, SAS OFF, and TRIM FAIL cautions will appear.
Collective Boost Servo Hardover/Power
Piston Failure.
Hardover failure of the collective boost
servo will increase control forces (as much as 150 pounds)
in the collective. The increased control forces can be immediately
eliminated by shutting off the boost servo.
Resulting control loads will be the same as for in-flight
boost servo off.
1. BOOST switch - Off.
2. LAND AS SOON AS PRACTICABLE.
Pitch Boost Servo Hardover
Hardover
failure of the pitch boost servo will increase the
longitudinal cyclic control forces (approximately 20
pounds). The increased control forces can be immediately
eliminated by shutting off SAS.
1. SAS (1 and 2) and FPS switches - Off.
2. LAND AS SOON AS PRACTICABLE.
BOOST SERVO OFF Caution Appears
Appearance of the BOOST SERVO OFF caution with no
other cautions appearing indicates a pilot valve jam in
either the collective or yaw boost servo. Control forces in
the affected axis will be similar to flight with boost off.
- BOOST switch - Off.
- LAND AS SOON AS PRACTICABLE.
Emergency Landing In Wooded Areas -
Power Off.
- AUTOROTATE. Decelerate helicopter to stop
all forward speed at treetop level. - Collective adjust to maximum before main rotor
contacts tree branches.
Ditching - Power On
- Approach to a hover.
- Cockpit doors jettison and cabin doors open
prior to entering water. - Pilot shoulder harness - Lock.
- Survival gear - Deploy.
- Personnel, except pilot, exit helicopter.
- Fly helicopter downwind a safe distance and
hover. - ENG POWER CONT levers - OFF.
- Perform hovering autorotation, apply full collective
to decay rotor RPM as helicopter
settles. - Position cyclic in direction of roll.
- Exit when main rotor has stopped
Ditching - Power Off.
- AUTOROTATE.
- Cockpit doors jettison and cabin doors open
prior to entering water. - Apply full collective to decay rotor RPM as
helicopter settles. - Position cyclic in direction of roll.
- Exit when main rotor has stopped
FLIGHT CONTROL/MAIN ROTOR SYSTEM
MALFUNCTIONS. (Note / Warning)
Note:
Blade cuff failure is typically a cord wise
crack of the cuff through the blade attachment
bolt holes on the upper or lower ligament.
Warning: Danger exists that the main rotor system could collapse or separate from the aircraft after landing. Exit when main rotor has stopped.
FLIGHT CONTROL/MAIN ROTOR SYSTEM
MALFUNCTIONS.
- LAND AS SOON AS POSSIBLE.
2. EMER ENG(S) SHUTDOWN after landing.
SAS Failure With No Failure Advisory
Indication.
tip path without failure/advisory indication: 1. SAS 1 switch - Off. If condition persists: 2. SAS 1 switch - ON. 3. SAS 2 switch - Off. If malfunction still persists: 4. SAS 1 and FPS switches - Off.
SAS 2 Failure Advisory Light On
POWER ON RESET s w i t c h e s -
Simultaneously press and then release
SAS OFF Caution Appears.
- SAS 1 and SAS 2 switches - Off.
- FPS switch - Off.
- LAND AS SOON AS PRACTICABLE
FLT PATH STAB Caution Appears
- EH SYSTEMS SELECT - DG/VG.
- POWER ON RESET s w i t c h e s -
Simultaneously press and then release.
If failure returns, control affected axis manually.
If the airspeed fault light remains illuminated on the
AFCS panel: - Manually slew stabilator - Adjust to 0° if
above 40 KIAS. The preferred method of
manually slewing the stabilator up is to use the
cyclic mounted stabilator slew-up switch. - LAND AS SOON AS PRACTICABLE.
FLT PATH STAB Caution Appears (Warning / Note)
Warning: If the airspeed fault advisory light is illuminated, continued flight above 70 KIAS with the stabilator in the AUTO MODE is unsafe since a loss of the airspeed signal from the remaining airspeed sensor would result in the stabilator slewing full-down.
Note:
Use of the cyclic mounted stabilator slew-up
switch should be announced to the crew to
minimize cockpit confusion.
Pitch FPS Trim Hardover
attitude and a corresponding longitudinal cyclic
movement of about 1⁄2 inch. This condition will be
detected by the SAS/FPS computer which will disengage
FPS and trim functions in the pitch axis and activate the
FLT PATH STAB and TRIM FAIL cautions
If failure occurs: 1. POWER ON RESET s w i t c h e s - Simultaneously press and then release. If failure returns, control affected axis manually. 2. LAND AS SOON AS PRACTICABLE.
Roll FPS/Trim Hardover
A roll FPS/trim hardover will be characterized by a
1⁄2 inch lateral stick displacement, resulting in a corresponding
roll rate and a constant heading sideslip condition,
caused by the yaw FPS attempting to maintain heading.
The SAS/FPS computer will detect the hardover
condition and disengage lateral trim and activate the FLT
PATH STAB and TRIM FAIL cautions
If failure occurs: 1. POWER ON RESET s w i t c h e s - Simultaneously press and then release. If failure returns, control affected axis manually. 2. LAND AS SOON AS PRACTICABLE.
Yaw FPS/Trim Hardover
A yaw FPS/trim hardover is characterized by an
improper motion of the pedals, resulting in about 1⁄4 inch
of pedal motion followed by a corresponding change in
helicopter heading trim. This condition will be detected by
the SAS/FPS computer, which will disengage trim and
FPS functions in the yaw axis and activate the FLT
PATH STAB and TRIM FAIL cautions
If failure occurs: 1. POWER ON RESET s w i t c h e s - Simultaneously press and then release. If failure returns, control affected axis manually. 2. LAND AS SOON AS PRACTICABLE.
Trim Actuator Jammed
Both yaw and roll
trim actuators incorporate slip clutches to allow pilot and
copilot inputs if either actuator should jam. The forces
required to override the clutches are 80-pounds maximum
in yaw and 13-pounds maximum in roll.
LAND AS SOON AS PRACTICABLE.
STABILATOR MALFUNCTION - AUTO MODE
FAILURE. (Warning x3)
Warning:
(1) If acceleration is continued or collective
is decreased with the stabilator in a trailing
edge down position, longitudinal
control will be lost. The stabilator shall
be slewed to 0° above 40 KIAS and fulldown
when airspeed is 40 KIAS or less.
If the stabilator is slewed up to the 0°
position and the AUTO CONTROL
RESET switch is pressed during acceleration,
the helicopter may pitch to a
nose down attitude.
(2) Pressing the AUTO CONTROL RESET switch after a failure occurs results in the automatic mode coming on for one second. If a hardover signal to one actuator is present, the stabilator could move approximately 4° to 5° in that one second before another auto mode failure occurs. Subsequent reset attempts could result in the stabilator moving to an unsafe position.
(3) If the stabilator AUTO mode repeatedly
disengages during a flight, flight above 70
KIAS is prohibited with the stabilator in
AUTO mode.
STABILATOR MALFUNCTION - AUTO MODE
FAILURE.
If an AUTO Mode Failure Occurs:
1. Cyclic mounted stabilator slew-up switch -
Adjust as required to arrest or prevent nose
down pitch rate.
2. AUTO CONTROL switch - Press ON once
after establishing a comfortable airspeed.
If automatic control is not regained:
3. Manually slew stabilator - Adjust to 0° for
flight above 40 KIAS or full down when airspeed
is 40 KIAS or less. The preferred
method of manually slewing the stabilator up is to use the cyclic mounted stabilator slew-up
switch.
4. LAND AS SOON AS PRACTICABLE.
If manual control is not possible:
5. STAB POS indicator - Check and fly at or
below KIAS LIMIT shown on placard.
6. LAND AS SOON AS PRACTICABLE.
Uncommanded Nose Down Pitch Attitude
- Cyclic - Adjust as required.
- Collective - Maintain or increase.
- Cyclic mounted stabilator slew-up switch -
Adjust as required to arrest nose down pitch
rate. - MAN SLEW switch - Adjust to 0° a t
airspeeds above 40 KIAS and full down at
airspeeds 40 KIAS or less. - LAND AS SOON AS PRACTICABLE.
Uncommanded Nose Up Pitch Attitude
- Cyclic - Adjust as required.
- Collective - Reduce as required.
- MAN SLEW switch - Adjust to 0° a t
airspeeds above 40 KIAS and full down at
airspeeds 40 KIAS or less. - LAND AS SOON AS PRACTICABLE.
ATTITUDE HEADING REFERENCE SYSTEM
(AHRS) HEADING DEVIATIONS.
If HSI deviation of more than 10° occurs between the
HSI and the standby magnetic compass:
1. Set the AHRU Control Unit to DG mode.
2. Manually update the HSI heading using the
standby compass.
3. LAND AS SOON AS PRACTICABLE.
EMERGENCY JETTISONING
When conditions exist which require the jettisoning of
external loads to ensure continued flight or execution of
emergency procedures, the crew should jettison the load as
follows:
CARGO REL or HOOK EMER REL switch
- Press.
MR DE-ICE FAULT, MR DE-ICE FAIL, or TR
DE-ICE FAIL Caution Appears.
a. If the MR DE-ICE FAULT caution appears, the
system will continue to function in a degraded mode. The
pilot must be aware of vibration levels and % TRQ
requirements, which could be a result of ice buildup.
b. If the MR DE-ICE FAIL caution appears, the main
rotor de-ice will automatically turn off. Tail rotor de-ice
will remain on.
c. If the TR DE-ICE FAIL caution appears, tail rotor
de-ice will automatically turn off. Main rotor de-ice will
remain on.
- Icing conditions - Exit.
- BLADE DE-ICE POWER switch - OFF,
when out of icing conditions.
If vibrations increase: - LAND AS SOON AS POSSIBLE
PWR MAIN RTR and/or PWR TAIL RTR
Monitor Light On.
If a PWR monitor light is illuminated with BLADE
DE-ICE POWER switch ON to stop power from being
applied to blades:
1. Icing conditions - EXIT.
2. BLADE DE-ICE POWER switch - OFF.
If a PWR monitor light is still illuminated with
BLADE DE-ICE POWER switch OFF:
3. GENERATORS NO. 1 or NO. 2 switch -
OFF.
4. APU generator switch - OFF (if in use).
5. LAND AS SOON AS PRACTICABLE.
Ice Rate Meter or DCIU Fail or Inaccurate
1. BLADE DE-ICE MODE switch - MANUAL as required. If vibration levels increase or %TRQ required increases above 14%: 2. BLADE DE-ICE MODE switch - Select higher setting. If ice buildup continues: 3. LAND AS SOON AS PRACTICABLE.
Loss of NO. 1 or NO. 2 Generator During
Blade De-ice Operation. (Caution)
Ensure that the mask blowers are
disconnected and position the BCA MCU
control knobs to OFF prior to switching
from main power to APU power.
Loss of NO. 1 or NO. 2 Generator During
Blade De-ice Operation
- EMER APU START.
- BLADE DE-ICE POWER switch - OFF then
ON.
