Hydraulics Flashcards Preview

Boeing 757 Technical > Hydraulics > Flashcards

Flashcards in Hydraulics Deck (18):
1

What flight controls get all 3 hydraulic system power?

Elevators and rudders

2

HMG normally powered by what hyd system normal and alt?

Left system, but can be right through the power transfer unit

3

Normal and ALT brakes powered by?

Normal = right
Alt = left

4

What can be powered by the right system through the PTU?

Flaps, slats, landing gear and nose wheel steering

5

RSVR light means? (2)

Either low reservoir quantity or pressure

6

Hyd OVHT means?

Overheated pump

7

When does load shedding occur on C2 hyd pump?

With only one source of electrical power

8

When does PTU automatically work? (2)

When left engine is shutdown or output pressure of left eng pump is low

9

IF leak has caused loss of left system how does PTU still work?

There is a standpipe in the reservoir

10

Can the PTU power the HMG?

Yes

11

When is HMG valve open and HMG auto powered?

When both AC buses are lost

12

With HMG operating does it take longer to use flaps and slats?

Yes

13

How normal brakes protected if right system leak?

Stand pipe in reservoir

14

What does isolation valve in reserve brake system do?

Makes sure reserve fluid is exclusively used for the brakes

15

Below what hyd quantity does the RSVR light come on?

Below 0.5 on status

16

When does RAT deploy automatically?

When both engines fail

17

Above what speed does RAT provide adequate sys pressure for flight control portion of centre system?

130kts

18

What hydraulics can the RAT provide services to?

Centre hyd system Flight controls