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Flashcards in Hydraulic Deck (15):
1

What fluid and what PSI for hydraulic system

Skydrol hydraulic
And 3000PSI

2

The main components of the hydraulic system

2 engine driven pump
4 electrical hydraulic pump
One hydraulic transfer unit
3 reservoirs
5 accumulator

3

How many hydraulic systems

3 systems

4

What does the hydraulic system provide power to?

Flight spoilers
Flight controls
Landing gear
Nose wheel steering
Wheel brakes
Trust reversers

5

Can the fluid from one system be used by another system

No

6

What is the system logic to activate the AC hydraulic pumps

In flight
EDP or engine fail
Flaps more than than 0

During landing the AC pump stays on for 60 seconds after speed below 50knots

On ground
Flaps more than 0 AND
TL set to T/O OR
Ground speed more than 50

7

When will the AC pump 2 will automatic be turned on

Engine 1 running and parking brake release
During engine 1 start and N2 more than 40% with parking brake set within 6 min

8

What is the pump unloader and the flow limiter valve for

To avoid overloading the RAT during is initial spining

9

What are accumulators for

Maintain constant pressure
Prevents pump cavitation

10

Important Items controlled by Hydraulic system 2

Inboard brakes
Nose wheel steering
Landing gear

11

What is the PTU

Power transfer Unit
Uses HYD 1 power to peovide HYD 2 pressure to assist in lowering the gear when HYD EDP 2fail

12

Purpose of HYD 3 system

Back up for primary flight control

13

When will the PTU automatically engage

When HEDP 2 fail
And flaps not set to zero or landing gear not up and locked
Reservour 2 more than 12%

14

How is the overheat protection system work

100c messgae on ICAS
125C Hydraulic shut off valve will close

15

What does the system 3 contains that system 1 and 2 does not have

Pump unloader and flow limiter
Restrict flow and power from electrical pump 3A so the RAT will not stall