Term
| What systems require hydraulic pressure? |
|
Definition
| Landing Gear, Wheel Brakes, Pusher, Rudder Boost, Spoiler/Speed Brakes |
|
|
Term
| What provides variable flow and pressure to the system? And at what rate? |
|
Definition
Two engine-driven hydraulic pumps at 3000psi (located on the accessory gear box
of each engine). |
|
|
Term
In case of a hydraulic pump malfunction, what prevents rotation without
interfering with the continued operation of the engine? |
|
Definition
The hydraulic pump connecting shaft to the AGB has a recess designed to work as
shaft shear point if the torque imposed by the hydraulic pump to the AGB exceeds
limits. |
|
|
Term
| What is the function of the Priority Valve? |
|
Definition
It guarantees hydraulic power to the spoilers, stick pusher, rudder spring actuator
or brakes by restricting the flow to the landing gear, if being used simultaneously. |
|
|
Term
| What encases the hydraulic fluid? |
|
Definition
A (spring-biased bootstrap diaphragm type) reservoir.
(50psi reservoir pressure, 3000psi system pressure) |
|
|
Term
|
Definition
|
|
Term
| What provides contamination protection for the system? |
|
Definition
Two disposable filter elements located on the lower portion of the manifold
(one for low pressure return and one for the high pressure line; the filter can
capture any particle greater than 5 microns). |
|
|
Term
| What would happen if the filter fails or is blocked by too much contamination? |
|
Definition
| A bypass valve will open to allow continued flow though the hydraulic system. |
|
|
Term
| What is available to indicate that the filters need to be replaced? |
|
Definition
The filters have red “pop-up” differential pressure indicators to provide a visual
indication when the filters need to be replaced. |
|
|
Term
| How are the Fire Shutoff Valves closed? |
|
Definition
Manually by the engine fire extinguisher shutoff buttons, automatically in case of
hydraulic system high temperature, or through the shutoff switches on the
hydraulic panel |
|
|
Term
| What does a “HYD HI TEMP” CAS message indicate? |
|
Definition
The hydraulic fluid temp has risen (to above 235+/- 7F) and both FSOV
automatically close |
|
|
Term
| What does a “HYD LO PRES” CAS message indicate? |
|
Definition
| The system is not capable of providing flow at rated pressure |
|
|
Term
| What does a “HYD SOV ½ FAIL” CAS message indicate? |
|
Definition
A Fire Shut Off Valve (FSOV) was commanded to close and did not close.
(or a FSOV position does not agree with its switch position). |
|
|
