controls

Question 1

Elec Hyd overheat light?

Answer 1

Hyd fluid to cool and lubricate elec motor driven pump - overheated or pump overheated.

Question 2

HYD pump low press?

Answer 2

The output press low.

Question 3

How is this HYD pump low Pressure light deactivated?

Answer 3

engine fire switch pulled

Question 4

ENG HYD PUMP switch, how it works?

Answer 4

De energize / energize blocking valve in pump to allow pump pressure to enter the system.

Question 5

Hyd system quantity?
System Press?

Answer 5

0 - 106%
normal - 3000psi
Max - 3500psi

Question 6

Both HYD pumps for system OFF?

Answer 6

read Hyd system Reservoir pressure - less than 100psi

Question 7

RF shown?

Answer 7

Hyd quantity below 76%

Question 8

RF reading Valid?

Answer 8

AC ground, both engines shutdown or after landing with flaps up during taxi.

Question 9

FLT CONTROL SWITCHES 3 positions?

Answer 9

STBY RUD -
*activates stby EMPD pump
*Shuts off the HYD System pressure to ELEV, Aileron and rudder, by closing the flight control shutoff valve.
*Opens stby rudder shutoff valve to press stby rudder PCU.
*Deactivate flight control low press light.
*Allows STBY system to power the Rudder and TR.
Illuminate STBY RUD ON, MCaut and Flight controls light.
..

OFF - closes flight control shutoff valve isolating ailerons/elevators/rudder for that system.
ON - normal ops

Question 10

Flight control LOW PRESS light means what?

Answer 10

Amber
low hyd press to aileron, elevator, rudder
Deactivated - FLIGHT CONTROL switch to STBY RUD and stby rudder shutoff valve opens.

Question 11

STBY HYD LOW quantity light?

Answer 11

low quantity in stby hyd reservoir
ALWAYS ARMED

Question 12

STBY HYD LOW PRESS Light
Meaning of light?
Armed?

Answer 12

output press of stby pump low
armed when stby pump ops selected or automatic stby function activated

Question 13

STBY RUD ON light?
Come on when?

Answer 13

Elec motor driven stby pump commanded to press the stby RUD PCU.

1) crew action
2) Hyd A/B system Failure

If not due this, then 2 other reasons:
1) FFM malfunction activating the STBY PUMP
2) Press Diff between two main PCU control valves indicating jammed condition.

Question 14

ALT FLAPS MASTER switch

Answer 14

OFF - normal
ARM - closes trailing edge flap bypass valve, activates stby pump, arms ALT FLAP position switch.

Question 15

3 Hyd systems?

Answer 15

A, B, STBY

Question 16

Why Press the reservoirs?

Answer 16

positive fluid flow to all pumps

Question 17

SYS A/B components?
MAx difference?

Answer 17

Max 8
LGT Valve - Sys A

Max 9
2 Pos Tail skid - Sys A
PTU - Sys A

Question 18

ENG DRIVEN PUMP OFF?

Answer 18

isolates fluid flow from system components only, but pump cont to rotate if engine operates.

Question 19

Pull engine fire switch?

Answer 19

shuts off fluid flow to EDP and deactivates LOW PRESS light.

Question 20

Location of Heat exchanger for Sys A/B?

Answer 20

A - main fuel tank 1
B - main fuel tank 2

Question 21

Min fuel for ground ops of Elec motor driven pump?

Answer 21

760kg in tank

Question 22

What send signals and illuminate Low Press light if pump output press low?

Answer 22

Pressure Switches, in engine and electric motor driven pump output lines

Question 23

System A Hyd Leak NG?
MAX?

Answer 23

NG
EDP - 20%
MDP - 0%
…
MAX
EDP - 1/4 or 20%
MDP - 0%

Question 24

Syst B Hyd Leak?

Answer 24

NG
Either line - 0%
Sys B one standpipe -fluid remaining enough for PTU.
Leak Sys B - no affect stby system
…
MAX
Same as NG

Question 25

PTU

Answer 25

Supply additional volume of Hyd fluid to operate AUTOSLATS and LEF+SLATS at normal rate - when SYST B EDP is INOP.PTU - System A press to power a HYd MDP to Press sys B fluid.
PTU operates auto when :
*Sys B EDP hyd drops below limits
*airborne
*flap not up

Question 26

LGTU

Answer 26

Supply volume of HYD fluid to raise LG normal rate when Sys A EDP volume lost.Sys B pump supplies the volume to operate LGTU when:
*airborne
*Nr 1 Eng RPM below limit
*LG Level UP
*either main LG NOT up/locked

Question 27

Tail skid if 2 position?

Answer 27

Sys A

Question 28

STBY HYD SYSTEM operates which systems?

Answer 28

Thrust Rev
Rudder
LEF + SLATS (extend)
Stby YD

Question 29

STBY HYD System can be activated how?

Answer 29

AUTO and MANUAL

Manual with FLT CONTROL switch or ALT FLAPS Master switch.

Auto conditions

Question 30

How to activate HYD STBY pump manually?

Answer 30

FLT CONTROL switch to STBY RUD:
*activate STBY EMDP
*Shuts off HYD SYS press to ail/elev/rud by closing flight control shutoff valve
*opens STBy rudder shutoff valve
*deactivate flight control Low Press light when STBY RUDDER SHUTOFF valve opens
*allows stby system to power RUD/TR
STBY RUN, MCAUT and FLT CONT light
…
ALT FLAPS Master switch to ARM:
activates stby EMDP
close TEF bypass valve
arms ALT FLAP position switch
allows stby syst to power LEF, slats and TR
…

Question 31

Automatic Ops of STBY HYD System?

Answer 31

When:
*Loss Sys A/B and,
*flaps extended
*airborne/wheel speed >60kts and
*Either FLT CONTROL switch A/B is ON

OR

MAIN PCU FFM Trips
..
Activates stby EMDP
opens STBY RUD shutoff valve
allows stby system power rudder / TR
STBY RUD ON, MC, FLT CONT

Question 32

STBY system LEAK?

Answer 32

ZERO, SYS B drops to 70% full

Question 33

LOW quantity light comes on when?

Answer 33

50% empty

Question 34

When will you see Variations in HYD quantity Indications?

Answer 34

*sys become press after start
*raise/lower LG or LED
*Cold Soak long flight

Question 35

Foaming?

Answer 35

Sys not properly PRESS, foaming ay high ALT. Recognized, press fluctuations, blinking of LOW PRESS light.