Emergency Procedures Flashcards
Single Engine Failure
Indications:
ENG 1 OUT or ENG 2 OUT warning light illuminated.
N1 below 61 +/- 1% and decreasing.
N2 below 85% and decreasing.
ITT below 400C and decreasing.
ENG 1 or ENG 2 OIL PRESSURE, DC GENERATOR, AND PART SEP OFF caution lights illuminated.
Procedures:
- Maintain rotor RPM within limits, airspeed 55-65 KIAS
- RPM INCR/DECR switch set N2 100% if possible.
- Affected engine throttle closed, Fuel Crossfeed switch to Override Close, Fuel Interconnect switch to OPEN.
- Affected ENGINE BOOST PUMP switch OFF.
- Verify FUEL BOOST caution light and FUEL switch to be turned off are all for affected engine.
- Affected ENGINE 1/2 FUEL switch OFF.
- Affected GEN 1/2 switch OFF.
- MASTER CAUTION light Reset.
- Land as soon as practical.
If NO. 2 engine failed:
- INV 3 to DC BUS 1
- BATTERY BUS 2 switch OFF.
- BATTERY BUS 1 switch ON.
- MASTER CAUTION light Reset.
- Land as soon as practical.
Engine Restart No. 1 in Flight
Monitor ITT when restarting engine in manual fuel control mode.
- Engine 1 throttle Closed.
- ENGINE 1 BOOST PUMP switch ON.
- Fuel Crossfeed switch Normal.
- ENGINE 1 FUEL switch ON.
- ENGINE NO. 1 GOV switch MANUAL.
- BATTERY BUS 2 switch OFF.
- BATTERY BUS 1 switch ON.
- INV 1 and INV 2 switches ON.
- INV 3 switch ON DC BUS 1.
- START switch ENG 1.
After 12% GAS PROD RPM N1 is attained and oil pressure is indicating, slowly open throttle until a rise in ITT, indicating engine is self sustaining. Do not open throttle farther until GAS PROD RPM N1 and ITT are stabilized. Continue to open throttle slowly to complete start. Center START switch after 55% GAS PROD RPM N1 is attained. Adjust engine to desired power level. Care must be taken to make small adjustments with throttle as compressor stall may result.
- GEN 1 switch ON.
- BATTERY BUS 1 switch OFF.
- BATTERY BUS 2 switch ON.
Engine Restart No. 2 in Flight
Monitor ITT when restarting engine in manual fuel control mode.
- Engine 2 throttle Closed.
- ENGINE 2 BOOST PUMP switch ON.
- Fuel Crossfeed switch Normal.
- ENGINE 2 FUEL switch ON.
- ENGINE NO. 2 GOV switch MANUAL.
- BATTERY BUS 1 switch OFF.
- BATTERY BUS 2 switch ON.
- INV 1 and INV 2 switches ON.
- INV 3 switch ON DC BUS 2.
- START switch ENG 2.
After 12% GAS PROD RPM N1 is attained and oil pressure is indicating, slowly open throttle until a rise in ITT, indicating engine is self sustaining. Do not open throttle farther until GAS PROD RPM N1 and ITT are stabilized. Continue to open throttle slowly to complete start. Center START switch after 55% GAS PROD RPM N1 is attained. Adjust engine to desired power level. Care must be taken to make small adjustments with throttle as compressor stall may result.
- GEN 2 switch ON.
Dual Engine Failure
Indications:
ENG 1 OUT and ENG 2 OUT warning lights illuminated.
RPM caution light illuminated.
ROTOR RPM audio on.
GAS PROD RPM N1 below 61 +/- 1% RPM and decreasing (both engines).
ENG RPM N2 below 85% and decreasing (both engines).
ITT below 400C and decreasing (both engines).
ENG 1 and ENG 2 OIL PRESSURE, DC GENERATOR, and PART SEP OFF caution lights illuminated.
Procedures:
Do not allow ROTOR RPM to decay below minimum limits.
Collective - Reduce, establish autorotative glide. Minimum rate of descent (65 KIAS) or maximum glide (90 KIAS).
If time permits and a restart will not be attempted:
- Throttles Closed.
- ENGINE 1 and ENGINE 2 FUEL switches OFF.
- ENGINE 1 and ENGINE 2 BOOST PUMP switches OFF.
Low-Side FCU Failure
Indications
Low ENG RPM N2 and ROTOR RPM Nr, possibly with RPM caution light and audio if power demand is in excess of single engine power available.
TORQUE split, proportional to power demand.
Low GAS PROD RPM N1, ITT and TORQUE on affected engine.
Procedures
- Adjust collective to maintain ROTOR RPM Nr.
- Airspeed 55-65 KIAS.
- Identify affected engine.
- Tighten throttle friction on normal engine, reduce on affected engine.
- Reduce throttle of affected engine.
- GOV switch (affected engine) MANUAL.
- Throttle (affected engine) increase slowly. Adjust throttle and collective as required to maintain TORQUE of affected engine slightly below TORQUE of normal engine.
- MASTER CAUTION light Reset.
- Land as soon as practical.
High-Side FCU Failure
Indications
High ENG RPM N2 and ROTOR RPM Nr, possibly with RPM caution light.
TORQUE split, proportional to power demand.
High GAS PROD RPM N1, ITT and TORQUE on affected engine.
Return of ENG RPM N2 and ROTOR RPM Nr to governed value if power demand is very high.
Procedures
- Adjust collective to maintain ROTOR RPM Nr.
- Identify affected engine.
- Reduce affected engine throttle to maintain TORQUE at or slightly below TORQUE of normal engine.
- Throttle friction, tighten on normal engine, reduce on affected engine.
- Affected engine throttle reduce to Idle.
- GOV switch of affected engine MANUAL.
- Affected engine throttle increase slowly. Adjust throttle and collective, as required, to maintain torque of affected engine slightly below torque of normal engine.
- MASTER CAUTION light Reset.
If values of overspeed parameters are unknown, or if Nr exceeds 110%, or if transmission torque exceeds 104%, land as soon as possible.
Engine Overspeed - Governor Actuator Failure
Indications
ENG RPM N2 and ROTOR RPM Nr increase to approximately 101%.
RPM INCR DECR switch inoperative.
Procedure
If this failure occurs during takeoff or landing, no immediate corrective action is necessary to complete either maneuver.
As soon as practical, roll back both throttles to maintain 97-100% ENG RPM N2. Further adjustment of collective and throttles simultaneously will allow full power at pilot discretion.
Land as soon as practical.
Engine Overspeed - Driveshaft Failure
Indications Left yaw. Rapid increase in ROTOR RPM Nr. Rapid increase in ENG RPM N2 Illumination of ROTOR RPM Nr caution light with audio. Possible increase in noise due to: - Overspeeding engine turbines - Overspeeding combining gearbox - Driveshaft breakage
Procedure
- Collective as required for autorotation.
- Airspeed - minimum rate of descent (65 KIAS) or maximum glide (90 KIAS).
- Throttles closed if time permits.
Engine Compressor Stall
Indications Engine "pops". High or erratic ITT. Decreasing or erratic N1 and N2 RPM. Torque oscillations.
Procedure Collective - reduce, maintain slow cruise flight. Heater switch ON. ITT and N1 check for normal indications. SEAT BELT and no smoking signs ON.
Engine Hot Start/Shutdown
Indications
Rapid rise in ITT.
Flames emitting from exhaust.
Procedure
Abort start of affected engine as follows:
1. Throttle closed, keep START switch engaged.
2. ENGINE (1 or 2) FUEL switch OFF.
3. ENGINE (1 or 2) BOOST PUMP switch OFF.
4. START switch engaged until ITT decreases to within limits.
Engine Oil Hot
Indications
Engine oil temperature above 115C
Procedure
- Collective, airspeed as required.
- Throttle (affected engine) Idle.
- ENG switch INCR; set ENG RPM N2 at 100% if possible.
If condition persists:
- Throttle (affected engine) Close.
- Complete engine shutdown.
- Land as soon as practical.
Engine Fire During Start
Indications
FIRE 1 PULL and/or FIRE 2 PULL handle(s) illuminated.
Procedure
- Abort start of affected engine; throttle Closed.
- FIRE PULL handle PULL.
- FIRE EXT switch MAIN.
- Fuel Pump Crossfeed switch Override Close.
- Fuel INTCON switch OPEN.
- Affected ENGINE BOOST PUMP switch OFF.
- Affected ENGINE FUEL switch OFF.
- Starter switch Disengage.
If FIRE warning light stays on past 10 seconds:
- FIRE EXT switch RESERVE.
- Engine shutdown complete.
- Exit helicopter.
Engine Fire During Takeoff/Approach
Indications
FIRE 1 PULL and/or FIRE 2 PULL handle(s) illuminated.
If landing site available, begin descent and approach, otherwise continue takeoff/approach.
Airspeed 45 KIAS minimum.
Reduce collective, if possible.
Pull appropriate FIRE PULL handle.
FIRE EXT switch MAIN.
If FIRE warning light remains illuminated for more than 10 seconds:
- FIRE EXT switch RESERVE.
- ENG RPM N2 (remaining engine) set 100%.
- Land as soon as possible.
- Engine shutdown, complete. Exit helicopter.
Engine Fire in Flight
Indications
FIRE 1 PULL and/or FIRE 2 PULL handle(s) illuminated.
Procedure
Immediately initiate emergency descent, if possible.
Shut down affected engine as follows:
- FIRE PULL handle Pull.
- FIRE EXT switch Main.
- Throttle Closed.
- Fuel Crossfeed switch Override Close.
- Fuel Interconnect switch OPEN.
- Engine BOOST PUMP OFF.
- Verify FIRE handle light, FUEL BOOST caution light, and FUEL switch to be turned off are all for affected engine.
- Engine FUEL switch OFF.
If FIRE warning light remains illuminated:
- FIRE EXT switch RESERVE.
- ENG RPM N2 (remaining engine) Set 100%.
- Land as soon as possible.
If landing site not readily available:
- FIRE PULL handle in.
- GEN (1 or 2) switch OFF.
If No. 2 engine was shut down:
- INV 3 to DC BUS 1.
- BATTERY BUS 2 switch OFF.
- BATTERY BUS 1 switch ON.
Cabin Smoke or Fumes
- VENT BLOWER switch ON.
- Open vents and windows.
- Airspeed 60 KIAS or less.
- Time/Altitude permitting, identify and isolate affected system.
- Land as soon as possible.
Baggage Compartment Fire
Indications
BAGGAGE FIRE warning light illuminated.
Procedure
- Reduce power to minimum required.
- Land as soon as possible.
- Inspect tailboom for damage.
Loss of Tail Rotor Thrust at Hover
Indications
Yaws right and possible roll and/or nose down.
Perform hover autorotation.
Loss of Tail Rotor Thrust in Climb
Close throttles and lower collective immediately.
Establish glide speed slightly above normal autorotation approach speed.
If a turn is required, make it to the right if possible.
Once aligned for landing, control yaw as follows:
- Right Yaw
If nose yaws right with power off, a pulse of up collective will produce more friction in mast thrust bearings, creating a left moment. The greater the input of pulse, the more the response will be.
Pulse should be rapid (up and down) but should not be used at low altitudes.
- Left Yaw
If nose yaws left with power off, a slight addition of power should arrest it. Further increase in power results in more right yaw increase. - Landing
During final stages of approach, a mild flare should be executed and all power to rotor should be off. Maintain helicopter in a slight flare and use collective smoothly to execute a soft, slightly nose high landing. Landing on aft portion of skids will tend to correct side drift. If helicopter starts to turn, move cyclic as necessary to follow turn until helicopter comes to a complete stop. This technique will, in most cases, result in a run on type of landing.
Loss of Tail Rotor Thrust in Level Flight or Descent
Autorotate. If altitude permits with AIRSPEED above 60 KIAS, throttle and collective may be gently applied to determine if some degree of powered flight can be resumed.
DC Failure to Produce Power
If either generator has not failed but circuit is open, generator switch RESET, then ON.
For single generator operation, nonessential busses may be restored by moving NON ESS BUS switch from NORMAL to MANUAL. Verify loads are within limits.