Hydraulics

Question 1

Where is HYD system indications displayed

Answer 1

HYD synoptic and on STAT page

Press and QTY

Question 2

What do each systems Power

Answer 2

L&R System:
Flight Controls
L&R Spoilers
same side engine thrust reverser

Center System:  (High load components)
Flight Controls
L&R Spoilers
Ldg Gear
Slats
Nose Gear steering
Flaps

Question 3

What pumps are used for Left and Right HYD system

Answer 3

Primary - EDP (eng driven pump)

Secondary - EMP (Electric Motor-Driven Pump)

(EMP only used when demand is high or EDP had failed)

Question 4

What pumps are used for the Center HYD system

Answer 4

2 EMP’s (C1 & C2)

rotates primary role every calendar day

Question 5

Describe the RAT

Answer 5

5,000 PSI pump
Emerg source of HYD Press and Elec power
Pressurizes the Center HYD system and Primary flight control components only

(can supply HYD and Elec simultaneously)

Question 6

How is QTY displayed on the STAT pg

Answer 6

displayed as a % of normal service level

(LO - LOw
RF - requires ReFilling
OF - Over Full)

Question 7

Can you transfer HYD pressure or fluid from one system to another

Answer 7

NO

Question 8

When will FAULT in Yellow on the Primary Eng pump switch

Answer 8

Pressure is low
high fluid temp
switched off

Question 9

What does the Fire switch pulled do to the HYD

Answer 9

closes the SOV and HYD fluid to the ENG pump is cut off

Question 10

What are the RT & LT Demand Pump (EMP) three control positions for

Answer 10

OFF
AUTO - operate to system Logic
ON - run continuously with Non-Normal procedure

(Same for the Center EMP)

Question 11

When do the L & R Demand Pump (EMP) work automatically

Answer 11

Low Press
On GRD for the first 3 Min after second eng is started
T/O Thrust to Flap Retracted
Gear down RA < 1,000 ft until GS < 40 kts
Thrust reverser operation

Question 12

When does the FAULT lite below each of the 4 EMP switch illuminate

Answer 12

operation but low press
fluid temp excessive
pump off

Question 13

When do the Center Demand Pumps (EMP) work automatically

Answer 13

Low Press
On GRD for the first 3 Min after second eng is started
T/O Thrust to RA > 2,000 ft
Gear down RA < 2,000 ft until A/S < 60 kts
when Flaps and Slats are in motion

Question 14

When does auto isolation occur

Answer 14

in the event of leak

purpose to protect gear and NWS operation

Question 15

Can the RAT be stowed after deployment

Answer 15

NO

Question 16

When does automatic RAT deployment occur

Answer 16

both eng Fail
3 HYD press low
loss of Elec to CA and FO instruments
All 4 EMP's in flight
All 4 EMP's and a Eng fails on T/O or LDG

Question 17

How do you know the RAT is supplying at least 3,000PSI

Answer 17

RAT switch PRESS light goes White

Question 18

Can RAT occur on the ground

Answer 18

YES

Question 19

What is the normal range for HYD press

Answer 19

> 3,000 (white)

< 3,000 (Yellow)

Question 20

What does a Grey Box mean on the Synoptic

Answer 20

invalid signal

Question 21

What is a symbol for a failed pump

Answer 21

Yellow X across box

Question 22

What is the Flight control surfaces switch for

Answer 22

LOCK the control surfaces
Maint action

Normal operation is to LOCK
do not unlock

Question 23

Before start check what order do we turn the EMP’s on

And Parking

Answer 23

Right to left

Left to right