Hydraulic System 1-34.3 Flashcards
engine driven hydraulic pump capacity?
5 quarts
The system incorporates
a pressure relief valve which operates within how many psi?
3250 to 3500 psi
The hydraulic pump pressurizes the normal system and emergency accumulator to
3000±120 psi
Once pressure exceeds
_______ the system can power the landing gear, main gear doors, flaps, speed brake, and nose wheel steering.
1800 psi,
If the hydraulic pressure indicator drops below 1800 psi, what happens?
the hydraulic pressure display will change from white to amber.
When will the amber HYDR FL LO annunciator illuminate?
If reservoir level has dropped below approximately 1 quart.
An amber EHYD PX LO annunciator is illuminated when he emergency accumulator pressure drops below what?
2400±150 psi
How to evaluate the state of the emergency hydr. system?
The EHYD PX LO is the only indication of the emergency accumulator’s status
A __________prevents the emergency system from bleeding back into the main system if the main system fails.
check valve
A ________is used to prevent a leak in the emergency system from depleting the main hydraulic system.
hydraulic fuse
The fluid flow to the emergency accumulator is
restricted to a rate below _______
.25 GPM (1 quart/min)
In the event of an emergency
hydraulic system leak that exceeds ________, the fuse
limits fluid loss to a maximum volume of __________.
.25 GPM; 20-30 cubic inches (0.5 quarts).
If the hydraulic leak rate is below .25 GPM, the system will deplete the main reservoir, and EMER GR extension is not possible.
False. If the leak rate is below .25 GPM, the system will deplete the main reservoir until the HYDR FL LO annunciator illuminates, at which time there will still
be sufficient fluid in the main reservoir to lower the landing
gear and flaps using the main system.
