AFCS Flashcards
4 signals of the stabilator actuator inputs to the fcc’s
“CLAP” -think “nerves of the system”
- Collective position transducers- (if collective goes up, stab goes down and vice versa).
- Lateral accelerometers-
- Airspeed x 2
- Pitch rate gyros
stab full up, full down
6to10 full up, 34-42 full down
AFCS does what?
- minimize workload
- enhances stability and handling qualities of the helicopter and provides autopilot workload.
Trim does what?
FPS does what?
holds aircraft in place
uses trim actuators to adjust
where is pitch trim?
gold actuator in the pilot assist area.
SAS 1 controls X%?
SAS 2 controls X%?
together X%?
most one SAS can have if either SAS fails? X%?
5
5
10
5
SAS acts ___ and then ___ resets it?
first
trim
Sensors are the ___/____ that feed the ____/FCC’s. Muscles are the ___.
nerves/inputs
Processers/FCC’s (CPTR 1/2)
trim
how many stabilator actuators?
2
how many trim actuators? what are they?
4
pitch, roll, yaw, collective
__ FCC is the only one that sends signals to the ____ actuators for flight
2
trim
_FCC receives AC power from the #_AFCS computer
1,1
what FCC operates off the battery?
also operates the #_ AFCS computer and #_ primary bus with the #_ AFCS circuit breaker
2
stabilator is?
variable angle of incidence
stabilator range is?
6to10 full up, 34to42 full down
inner loop
outer loop
SAS - short term (no movement to flight controls)
TRIM - long term (moves flight controls)
2FCC?
-sends signals to trim actuator for flight dynamic flight control inputs.
both FCC’s
- provide self monitoring
- fault isolation
- failure alerts
- advisory and caution indications.Sensor inputs to each FCC are compared via the Cross Channel Data Link (CCDL).
Outputs of stabilator
“SCALP”
- Streamlines-downwash of main rotor during airspeeds <30kts.
- Collective coupling (up of collective, down with stabilator and vise versa)
- Angle of Incidence- decreases as A/S increases.
- Lateral sideslip- left pedal-stab goes down; right pedal and stab goes up (like blinker) (has to do with induced flow to stabilator.
- Pitch Rate- Pitch rate feedback. STABILATOR GOES OPPOSITE OF WHAT NOSE IS DOING (gyros control it)
what speed range is stab down?
30-40kts
SAS controls?
and is connected to?
pitch, yaw, roll
pilot assist
Pitch trim is which actuator?
it is the only one that needs ___ ____
gold
hydraulic assistance
inner loop?
sas
below what speed will pedal turn adjust to a new heading?
50
FPS operates above _kts?
recovery operates above _ kts?
50
60
What are the main rotor subsystems
m/r blades, hub, flight controls, bifilar vibration absorber.
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 seconds
The _____ accessory module has a low oil pressure switch and chip detector.
Left
Main XSMSM oil capacity?
7 gallons
The main transmission is made up of ____ modules.
five (Two input modules, the main module, and two accessory modules)
Each accessory module has a mounting flange for the installation and drive of the :
Main ac generator and Main hydraulic pump
Where is the low oil pressure switch located
Left accessory module
The main transmission may run at cruise flight for ____ with loss of oil?
30 Minutes
The ac generators on the accessory modules also receive oil for what?
Cooling
The oil temperature senor is also the chip detector located where?
Main module, intermediate module, tail rotor module.
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 radiator
What caution appears if a chip detector fails the PBIT during power up
chip ibit fail
The oil filter has _____ stages?
Two
Does deactivation of the fuzz burn-off feature disable detection and cautions?
No
The fuzz burn-off feature is deactivated when oil temperature reaches ___?
140 C
Does the engine have fuzz burn capability?
No, only the tranny
When inspecting the flexible couplings, check for ____, _____, and ______.
Buckling, Cracks, and Security.
