Hydraulics Flashcards
There are 4 independent systems driven by
EDP (Engine driven pumps) & Demand pumps ()
Systems 1 and 4 have demand pumps.
ADP (Air Driven) ()
Systems 2 and 3 have demand pumps.
ACMP (AC electric) ()
The _____ Aux Pump works with System fluid.
4
The Aux pump is operated by a _____system.
electric ()
The Aux pump can be used both on the ground and in the air. True or False
False. Ground use only, for breaking and MX purposes ()
What hydraulic system powers the alternate brakes and the body gear steering system?
System 1 only (FCOM 13.20.2)
What hydraulic system powers the respective autopilot servos?
3 Left Autopilot, 1 Center Autopilot and 2 Right Autopilot (FCOM 13.20.2)
What causes the EICAS message “HYD PRESS DEM” to remain displayed after the selector has been placed in the ON position?
Pump pressure low.
<p>Select the correct statement:</p>
<p>Demand pumps 1 & 4 operate pneumatically. Electric power is required for EDP aux pump</p>
The electric AUX pump in system 4 …
Will produce normal breake pressure when on the ground
Demand selector 4 is in AUX. Select the correct statement…
The AUX pumps stops when EDP provides pressure
The EDPs can not deliver hydraulic pressure …
While engines are not running, and engine pump not switched ON, and eng fire switch pulled ()
<p>With flaps in landing position during approach ...</p>
<p>HYD 1 & 4 demand pumps activate ()</p>
Engine 3 is shut down due to a fire warning and the fire switch is pulled, and fuel control switch 3 in CUTOFF. Select the correct statement:
EDP depressurizes, and the respective demand pump operates, SOV 3 closed
You are on approach selecting flaps 5. HYD PRESS DEM 1 message appears. What should be done?
Possible auto logic failure. Turn HYD 1 demand pump on ()
Which abnormal condition does not trigger the SYS FAULT light?
system reservoir pressure low ()
The beeper sounds and hydraulic SYS FAULT light 2 is on. Which message triggers the EICAS caution alert?
HYD PRESS SYS 2 (FCOM Chapter 13 Section 30)
During flap extension while taxiing out, the SYS FAULT light 4 illuminates and the message HYD OVHT 4 appears. What describes the situation correctly?
Excessive hydraulic temp. detected. (When temp above 105 deg) possible overheated pump. ()
What conditions would cause the DEMAND pumps to operate with the selector in the AUTO position?
Respective engine output pressure low or fuel control switch in cutoff. ()
When the #1 EDP switch is ON, when will the #1 engine produce pressure?
Eng rotates ()
What condition would automatically command Hydraulic demand pumps #1 and #4 to operate?
TE flaps in transit, or flaps extended with engines IDLE ()
What causes the EICAS message “HYD PRESS DEM 4” to be displayed?
Selector in AUX position after ENG startup
The HYDRAULIC demand pump in System 4 is disabled when the system 4 demand pump selector is in the AUX position. True or False
TRUE ()
With a HYDRAULIC system 1 failure, what capability is lost?
Center Autopilot, Inboard TE flap, Nose & Body Steering\actuation, Left outboard elevator ()