Sys 2 Flashcards
Primary servos
Laterl- left
Aft
Fwd
SAS
Yaw
Roll
Pitch - box
Boosted controls
Collective
Yaw
Pitch
Trim
Pitch roll yaw collective
Five cons where backup hydro will come on
Res 1 low, hyd pump 1, t/r servo 1, hyd pump 2, apu accum low
Inner loop
SAS
Dynamic stability
Short term inner loop sas fast response
Outer loop
FPS & trim long term full authority static stability
Static stability
FPS and trim
How long is the hydraulic logic open? Vs the main AC generator?
This valve is held open by the hydraulic logic module for 3 to 5 seconds when either the APU generator or external power is supplying power, or for 0.5 second when the main AC generators are supplying power.
Is ng / Np connected mechanically?
No
Np and NR connected mechanically ?
Yes
Engine Abort Start Criteria
No TGT rise within 45 seconds, No Np1 or Np2 within 45 seconds, No Eng Pressure 1 or 2 within 45 seconds, ENG Starter Caution off before reaching 52% NG, TGT rises above 851 Degrees.
Trim is solely implemented by ?
FCC 2
Electromagnetic actuators -3
Electrohydraulic -1
3- roll, yaw, collective
1- pitch
Tail rotor
cAnted 20*, produces 2.5 % lift
TAIL ROTOR QUAD FAIL
Can be one or both cables broken, can tell by adjusting collective
Will work between 25-145 kts and fix pitch at 10.5 fix pitch if both broken
One broke? U good
Main transmission has how many degree fwd tilt?
3 degrees
What are the three priorities of power? (Electrical)
First Priority – Main Generators. If there is at least one Main Generator operating, with one exception, the APU Generator or the External Power Receptacle will not be able to power the system.
- Second Priority – APU Generator. If the APU Generator is operating the External Power Receptacle will not be able to power the system.
Third Priority – External Power Receptacle. A ground power unit (GPU) attached to the External Power Receptacle will only be able to power the aircraft if there are no generators operational.
How is the main generator cooled?
Each Main Generator is rated at 30/45 KVA,
is cooled by transmission oil,
and provides 115/200 VAC, 3 phase, 400 Hz power
How is the APU cooled?
The APU Generator is rated at 20/23.8 KVA,
is air cooled
and provide 115/200 VAC, 3 phase, 400 Hz power
How many generators does it take to run the blade de ice?
Takes two generators
Or APU can run with the help of another generator but not by itself
CHIP L/R INPUT MDL
Idle
CHIP L/R ACC MDL
LAND ASAP
If you’re just down to battery power how long do you have ?
Provide uninterrupted emergency power for 15 minutes (12 minutes at night with the search light on)
GEN 1 and 2 FAIL caution
The generator fail cautions do not appear unless AC power is available. The lights are powered by the DC Primary busses.
During run-up, both lights should go off above 97% Nr.
iii. Appears whenever generator output is interrupted.
iv. The other generator will then supply power to all busses.
v. Disappears with a successful generator test.
APU GEN ON
Comes on when APU is the sole source of of Ac Pwr
Each generator has a primary and alternate bearing, how many flight hours will the alternative provide if you have a GEN BRG 1/2 FAIL?
10, alternate bearing provides
CONV 1 (or 2) FAIL : converter 1 or 2 has no output
Do nothing, especially do not turn off the battery switch Or you’ll lose power
Turning No. 1 battery switch off will result in loss of No. 1 BATT Bus and No. 1 DC ESS bus.
AC REF BUS DEGRAD- advisory light
Appears when one of the two auto-transformers supplying bus power has failed.
ADVISORY LIGHT, when transformer has failed
dual generator failure
will result in loss of all ac powered systems,
Look for ac ref bus degrade In advisory
- Airspeed — Adjust (80 KIAS or less).
- GENERATORS NO. 1 and NO. 2 switches— RESET; then ON.
If electrical power is not restored:
- GENERATORS NO. 1 and NO. 2 switches— OFF.
- MCUs and ECS– OFF prior to EMER APU START.
- EMER APU START.
- LAND AS SOON AS PRACTICABLE.
- If APU GEN ON advisory extinguishes, ensure MCUs and ECS – OFF prior to resetting the APU generator.
GEN 1 FAIL or GEN 2 FAIL Caution Appears
- Affected GENERATORS switch — RESET; then ON.
If caution remains:
- Affected GENERATORS switch — OFF.
With a dual converter failure which BUS will not be hot?
Primary busses
You only have 15 min left on the battery power and 12 at night
What drives LRUs on accessory gearbox?
NG
The HMU operates what part of the compressor section?
Variable guide veins
What drives the Accessory Gearbox?
Gas generator
How does the cockpit receive the Ng signal?
Ng wiring if alternator
Ng governing is influenced by what input to the HMU?
T2 sensor
When will TGT Limiting not work?
Lockout, compressor stall, start up
The MMU is designed to reduce __________________________.
Inherent Control Coupling
How does the MMU minimize inherent control coupling?
By combining, summing, and coupling collective,
pitch, roll and yaw inputs.
Why is Collective/Airspeed to Yaw mixing completely phased out when the airspeed is above 100 kts?
Due
to the efficiency of the tail rotor and cambered fin.
What is the only trim actuator that receives hydraulic power from the number 2 hydraulic system?
Pitch
HYD LEAK TEST switch allows testing of the ____.
Ldi
The RSVR 1/2/Backup LOW caution illuminates when?
60% fluid remaining
The No. 2 hyd. system supplies pressure through the transfer mod to what servos?
The second stage
primary servos and the pilot-assist servos.
Basic autopilot functions are provided by?
Trim- FPS
What are the four signals used by the FCC’s to position the Stabilator
(Co)llective
(L)ateral
(A)irspeed
(P)itch
What are the five basic subsystems that comprise AFCS?
Stabilator, Trim, SAS, FPS, and Coupled FD
When does SAS 1 and 2 enhance turn coordination?
When the FCC compute data at airspeeds above 50 kts
When will a heading hold be captured in a hover?
When yaw rate reaches zero, not when pedal switches
are engaged
What will the FCC’s do if A/S signal is lost?
Shut off
What are the additional features of AFCS?
Heading hold, Pitch and roll hover augmentation/gust alleviation, Turn coordination, Fault detection and annunciations
What employs rate damping to improve helicopter stability, 10% control authority, fast in response, and can operate without causing movement of the flight controls?
Inner loop ie SAS
To attempt to clear AFCS fault indications, the pilot can?
Press the illuminated CPTR 1 and/or
CPTR 2 button
What does the SAS DEGRADED advisory mean?
The SAS pitch, roll, or yaw channel has disengaged
What does the STAB DEGRADED advisory mean?
The stabilator is in a limited auto mode.
The engine driven fuel boost pumps are driven by?
Ng part of engine
When must pitot heat be turned on?
Below 4 degrees and visible moisture pitot heat must be on
Conical Elastomeric bearings permit what movements?
Flap, lead, lag
Cylindrical Elastomeric bearings permit what movements?
Provides the pitch change axis
Main module chip detector has a _____ time delay to allow fuzz burn to work?
30 sec delay
The ________ accessory module has a low oil pressure switch and chip detector
Left
The main transmission may run at cruise flight for _______ with loss of all oil?
30 min
What range should oil pressure remain steady in to ensure any fluctuations occur they remain in the acceptable range?
45 to 60 psi
What is used to cool the main transmission oil?
Oil cooler fan and the radiator
What are the main rotor subsystems?
m/r blades, hub, flight controls, bifilar vibration absorber
GCU GENERATOR CONTROL UNITS over and under voltage
Over voltage: When the generator output voltage rises above limits generator is disabled and disconnected from the system
Under voltage: 85-89% NR
The rotor brake system is designed to hold the main and tail rotor system during engine starting, with bothengines at IDLE and to stop the rotors in approximately ___-___ seconds with 150-180 psi applied at 40%NR during engine shutdown.
12-18
Each arm of the hub assembly is pre-lagged and pre-coned __° to reduce the torque bending movement from the head and reduce vibrations
7
Does the engine have fuzz burn capability?
No
The oil temperature sensor is also the chip detector located where?
Main module, intermediate module, tail rotor module
What are the stabilator function?
Streamlines – compensates for rotor downwash ●
Collective coupling – minimize pitch excursions due to collective inputs ●
Angle of Incidence – Angle of Incidence decreases as airspeed increases ●
Lateral Sideslip – Sideslip to pitch coupling to reduce susceptibility to gusts ●
Pitch Rate – pitch rate feedback to dampen pitch excursions ●
Air data computer – Connected to pitot static system
The rotor brake solenoid locks the ______________ in the ground idle position through a locking arm linked to the solenoid.
EPCLs
To know
Lockout does not prevent Max Fuel Flow and NG limits.
NP and NR are connected via a one way mechanical connection.
Submerged pumps are not usually used IOT prevent pressurized fuel lines.
T/R Quad Fail with no control signifies both cables have been severed.
If HYD Pump 2 and Back up Pump fail, Pilot assist and #2 primary will be unpressurized.
Pulling down on the PCL will disengage the started.
If the start caution stays on, you’ll have to remove the air source.
What happens when an auto transformer fails
the AC REF BUS DEGRAD light will appear
The engine driven fuel boost pumps are driven by?
Ng part of eng
Which fuel cell feeds the APU?
Number 1 fuel cell
Where does power from the slabs go?
Battery utility bus (bub), battery bus, DC essential bus
The main transmission is made up of ____ modules.
Five (Two input modules, the main module, and two accessory modules)
FUEL 1 BYPASS or FUEL 2 BYPASS Caution Appears
ENG FUEL SYS selector on affected engine — XFD.
- LAND AS SOON AS PRACTICABLE.
FUEL 1 BYPASS and FUEL 2 BYPASS Cautions Appear.
LAND AS SOON AS POSSIBLE.
FUEL 1 LOW and FUEL 2 LOW Cautions Appea
Land as soon as practicable
FUEL 1 PRESS LOW or FUEL 2 PRESS LOW Caution Appear
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:
- ENG FUEL SYS selector on affected engine — XFD.
- FUEL BOOST PUMP switch on side being used — ON.
- LAND AS SOON AS POSSIBLE.
- EMER ENG SHUTDOWN after landing.
b. Non-critical situations are those where single engine flight is possible.
c. If the caution appears, and the situation is not critical: - ENG FUEL SYS selector on affected engine — XFD.
- FUEL BOOST PUMP CONTROL switches — NO. 1 PUMP and NO. 2 PUMP — OFF (As applicable).
- LAND AS SOON AS PRACTICABLE.
FUEL 1 PRESS LOW and FUEL 2 PRESS LOW Cautions Appear
- LAND AS SOON AS POSSIBLE.
2. EMER ENG SHUTDOWN after landing
Which gearboxes have fuzzburn?
All of them, main mod has 30 sec delay
Submerged boost pump
Normally the aircraft is flown with the pumps off so the fuel lines have a negative pressure going up to the engine driven boost pumps.
This is beneficial because if a fuel line is severed then the engine would be sucking air instead of having a pressurized fuel leak which could possibly lead to a fire.
Fuel low caution comes on
172lbs left
