If the primary hydraulic system fails, what is the effect, if any, on the flight control system?
Loss of the Flight Management Computer (FMC) and Backup Control System (BUCS) inputs
Where are the primary hydraulic system dirty filter indicators located?
On the primary manifold
Which components/systems lose hydraulic power in the event the utility reservoir is low?
- Pylons
- AWS elevation actuator and azimuth drive motor
- Servos
- Tail wheel unlock actuator
- Ammo carrier
During preflight, the utility accumulator pressure gauge should indicate a minimum of ____psi prior to attempting an auxiliary power unit (APU) start
2600
During preflight, what pressure should the utility hydraulic return actuator gauge indicate?
55 psi
What is purpose of the hand pump?
Charge the utility hydraulic accumulator and fill the primary and utility hydraulic reservoirs
What is the crew station indication when the tail wheel is unlocked?
UNLOCK indicator is illuminated
When is the hydraulic pressure displayed on the ENG page flight format?
When it is 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 (>3410 psi) range?
5 seconds
How much PSI does the three positions of the Rotor Brake have?
- Off-30
- Brk-337
- Lock- 3000
How long will you have the control with emergency hydraulic power?
30-41 secs
What does the primary Hydraulic Pump do?
Draws low pressure fluid from the primary hydraulic reservoir and provides pressurized hydraulic fluid to the primary hydraulic manifold
What does the primary hydraulic manifold do?
Stores, Filters, Supplies, Routes, and regulates hydraulic fluid
What does the primary hydraulic system do?
Provides 3000 PSI of pressurized hydraulic fluid to the primary side of the flight control servoactuators
What does the primary hydraulic ground support equipment panel do?
For servicing the primary reservoir and bleeding the primary hydraulic system
What does the utility hydraulic system do?
Provides hydraulic power to: (PUTAAA
-Utility side of flight control servoactuators
-Tailwheel lock actuator
-AWS Elevation Actuator
-AWS Azimuth Drive motor
-Ammo carrier drive motor
-Pylons
AND
Provides a source of stored, high-pressure hydraulic fluid for rotor brake operation, APU Starter Motor Operation, and Emergency Operation of the flight control servoactuators
What does the utility hydraulic return accumulator do?
Dampens pressure spikes from the Gun turret
What does the primary hydraulic manifold reservoir do?
- Stores low-pressure hydraulic fluid
- Pressurized to 31 plus or minus 3 psi by the IPAS
- Prevents fluid foaming and pump cavitation
What are the components of the primary hydraulic manifold reservoir?
- Fluid level indicator
- Piston assy
- Air inlet check valve
- Manual air bleed valve
What are the components of the primary hydraulic manifold?
- Low level switch
- Low-pressure relief valve
- Drain port
- Pressure switch
- Pressure filter
- Return filter
- Dirty-filter indicators
- GSE check valve
- GSE return isolation
- Pressure transducer
- High-pressure relief valve
Where are the hydraulic pumps located?
Left and right aft drive pad of the main XMSN
What are the components of the utility hydraulic reservoir?
(Proud Firefighters Always Make Anal Leaks Disappear)
- Piston Assy
- Fluid level indicator
- Air inlet check valve
- Manual air bleed valve
- Air relief valve
- Low-pressure relief valve
- Drain port
What are the components of the utility hydraulic manifold?
(Life Always Lets Pilots Prefer Pure Drinkable
Hydration Really Really Far Away After Observing Eagle Ass)
- Low-level valve
- Auxiliary isolation valve
- Low-level switch
- Pressure switch
- Pressure transducer
- Pressure filter
- Dirty filter indicator
- High-pressure relief valve
- Return filter
- Return dirty filter indicator
- Filter bypass valve
- Accumulator isolation inlet check valve
- Accumulator isolation valve
- Override solenoid valve
- Emergency hydraulic pressure transducer
- Apu starter return check valve
