Hydraulic Flashcards
(38 cards)
What does Sys B pwr?
#2 Thrust Reverser Rudder Ailerons Elevator & Elevator Feel Outboard Flight Spoilers Normal Brakes Autopilot "B" Alternate for - Landing Gear Alternate for - Nosewheel Steering L.E. Flaps and Slats Autoslats Trailing Edge Flaps Yaw Damper
What does Sys A power?
#1 Thrust Reverser Rudder Ailerons Elevator & Elevator Feel Inboard Flight Spoilers Alternate Brakes Autopilot "A" Landing Gear Nosewheel Steering Ground Spoilers
What does the Stby sys pwr?
#1 Thrust Reverser #2 Thrust Reverser Rudder Stby Yaw Damper L.E. Flaps and Slats
How many hydraulic pumps?
5
Hydraulic pressure?
3000 psi
Sys A & B have what types of pumps?
The A and B systems are each pressurized by an engine driven pump and an electric motor driven pump.
How is the Stby Sys pump worked & powered?
In the event system A or B fails, the Standby system may be pressurized by a motor driven pump that is powered by the #2 AC Transfer bus.
Describe the PTU:
Upon loss of pressure from the engine driven pump on the B system, the PTU is driven by pressure from the A system.
The left side of the PTU is a hydraulic motor.
The right side of the PTU is a hydraulic pump that is driven by the left side of the PTU. It receives fluid from the B reservoir.
What does the PTU do:
The PTU provides a backup source of hydraulic pressure to assist the B system electric motor pump to operate the leading edge devices and the autoslat system when the B system engine driven pump output is below normal.
How are the A & B resivoirs pressurized?
Reservoir head pressure is maintained by bleed air to ensure fluid flow from the reservoirs to the hydraulic pumps.
The A and B reservoirs are pressurized from the pneumatic manifold.
The STBY resivoirs gets fluid and pressure from what Sys?
Sys B balance line
What does the hydraulic OVERHEAT LIGHT mean and about which motor?
OVERHEAT lights illuminate if the fluid in the ELECTRIC motor pump case drain or pump housing is too hot.
What do hydraulic LOW PRESSURE lights mean?
The LOW PRESS lights illuminate if the output pressure from the associated pump is too low.
Where are SYSs A&B qty and pressure normally shown?
Lower DU
When does the Refill (RF) indication show?
The RF (refill) indication appears if the quantity is below 76% with both engines shut down or after landing with flaps up during the taxi in.
When is the hydraulic standby PRESSURE LOW light illuminated?
If the Standby system is operating and its pump output pressure is low, the Standby Hydraulic LOW PRESSURE light illuminates.
The light is inhibited when the Standby system is off.
When does the hydraulic stby system QTY LOW light come on?
The Standby system LOW QUANTITY light is always armed.
It illuminates if the fluid level is below 50 %.
With a leak in SYS A, how far will the resivoir drain to?
If a leak develops in the lines associated with the engine pump, the reservoir will drain down to the top of the standpipe.
Thus, in the event of a leak in the lines associated with the engine pump, the reservoir will maintain approximately 20% of the hydraulic fluid for operation of the electric motor driven pump.
What happens if there’s a leak in the line for the SYS A elec pump?
The “A” system electric motor pump receives fluid from the bottom of the “A” system reservoir.
A leak in the lines associated with the electric motor pump will cause the “A” system reservoir to empty.
What is minimum fuel in tanks 1& 2 respectively for SYS A & B respectively elec motor pump on the ground for cooling?
1675 lbs
With a loss of electrical power, the shutoff valve opens and the engine pump fails to the XXX condition.
On condition
If the engine Fire Switch is pulled, the fire shutoff valve will close to stop the delivery of hydraulic fluid to which pump(s)?
the engine driven pump
During normal operations the A system provides pressure for both the xxx and xxx.
landing gear and nosewheel steering operation
What bus powers the SYS B hydraulic elec pump?
the AC Transfer Bus #1.
