Hydraulics Flashcards
Primary Hydraulic System failure results in loss of
FMC and BUCS inputs
Where are the primary hydraulic system dirty filter indicators located?
On the primary manifold
Which components and/or systems lose hydraulic power in the event the Utility reservoir is low?
Ammunition Carrier Drive Motor
AWS Elevation Actuator
AWS Azimuth Drive Motor
Pylon Actuators
Tail Wheel Unlock Actuator
Utility side of the Tail Rotor Servo
NOTE: AWS = Area Weapons System
During preflight, the utility accumulator pressure gauge should indicate a minimum of _____ psi prior to attempting an APU start.
2600 PSI
During preflight, what pressure should the utility hydraulic return actuator gauge indicate?
55 PSI
What is the purpose of the hand pump? When is it used?
Charge the utility hydraulic accumulator and fill the primary and utility hydraulic reservoirs
Use if Utility Hydraulic Pressure is less than 2600.
Use after abort start to increase pressure to 3000 PSI.
CAUTION:
Restrictor valve can be ruptured during hand pump replenishment of the utility accumulator. Will not allow pressure to reach 3000 PSI
What is the crewstation indication when the tail wheel is unlocked?
“Unlocked” is illuminated on Tail Wheel/NVS Mode Switch panel
When is the hydraulic pressure displayed on the ENG page flight format?
When out of normal limits
What does the Caution UTIL HYD BYP indicate?
Utility return system indicates a “dirty filter” impending bypass condition.
What is the time limit for either Hydraulic System operating in the transient (> 3400 psi) range?
5 sec.
How many hydraulic systems are there?
UTIL and PRIMARY
What are the main components of the primary hydraulic system?
Primary Hydraulic Pump
Primary Hydraulic Manifold
Flight Control Servoactuators (x4)
Primary Hydraulic Ground Support Equipment Panel
What are the 4 servoactuators associated with the primary hydraulic system?
Longitudinal
Collective
Lateral
Directional (on Tail Rotor)
Note: listed in order from left to right look at the nose of the aircraft.
(T)(F) It can be argued that there are 3 hydraulic systems.
True.
Utility accumulator - provides emergency hydraulic pressure for the flight controls / APU start/ Rotor Brake
The primary hydraulic reservoir uses IPAS to pressurize to ________.
31 ± 3 psi to prevent pump
cavitation/foaming