controls Flashcards
Elec Hyd overheat light?
Hyd fluid to cool and lubricate elec motor driven pump - overheated or pump overheated.
HYD pump low press?
The output press low.
How is this HYD pump low Pressure light deactivated?
engine fire switch pulled
ENG HYD PUMP switch, how it works?
De energize / energize blocking valve in pump to allow pump pressure to enter the system.
Hyd system quantity?
System Press?
0 - 106%
normal - 3000psi
Max - 3500psi
Both HYD pumps for system OFF?
read Hyd system Reservoir pressure - less than 100psi
RF shown?
Hyd quantity below 76%
RF reading Valid?
AC ground, both engines shutdown or after landing with flaps up during taxi.
FLT CONTROL SWITCHES 3 positions?
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
Flight control LOW PRESS light means what?
Amber
low hyd press to aileron, elevator, rudder
Deactivated - FLIGHT CONTROL switch to STBY RUD and stby rudder shutoff valve opens.
STBY HYD LOW quantity light?
low quantity in stby hyd reservoir
ALWAYS ARMED
STBY HYD LOW PRESS Light
Meaning of light?
Armed?
output press of stby pump low
armed when stby pump ops selected or automatic stby function activated
STBY RUD ON light?
Come on when?
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.
ALT FLAPS MASTER switch
OFF - normal
ARM - closes trailing edge flap bypass valve, activates stby pump, arms ALT FLAP position switch.
3 Hyd systems?
A, B, STBY
Why Press the reservoirs?
positive fluid flow to all pumps
SYS A/B components?
MAx difference?
Max 8
LGT Valve - Sys A
Max 9
2 Pos Tail skid - Sys A
PTU - Sys A
ENG DRIVEN PUMP OFF?
isolates fluid flow from system components only, but pump cont to rotate if engine operates.
Pull engine fire switch?
shuts off fluid flow to EDP and deactivates LOW PRESS light.
Location of Heat exchanger for Sys A/B?
A - main fuel tank 1
B - main fuel tank 2
Min fuel for ground ops of Elec motor driven pump?
760kg in tank
What send signals and illuminate Low Press light if pump output press low?
Pressure Switches, in engine and electric motor driven pump output lines
System A Hyd Leak NG?
MAX?
NG
EDP - 20%
MDP - 0%
…
MAX
EDP - 1/4 or 20%
MDP - 0%
Syst B Hyd Leak?
NG
Either line - 0%
Sys B one standpipe -fluid remaining enough for PTU.
Leak Sys B - no affect stby system
…
MAX
Same as NG
