The indication 'REGUL LO PR' comes on:
-
When the pressure in the intermediate line is too low.
-
When the low pressure switch does not operate.
The indication 'REGUL SYS1' and 'REGUL SYS2' come on:
-There is no electrical power supply.
-
The signal OPEN is active and the oxygen regulator is fully closed.
-
The signal OPEN is not active and the oxygen regulator is not fully closed.
-There is an internal error of the oxygen regulator.
The indication 'CHECK' comes on:
-
When the pressure in the cylinder assembies is less than 1600 psi (110.3161 bar).
The indication 'LO' comes on:
-
When the pressure in the cylinder assembies is less than 200 psi (13.7895 bar).
7. Ground Test
___________
The quantity calculation and control unit 960WR has a power up test and a continuous test. It checks:
-
The pressure transmitters
-
The temperature transducer 975WR
-
The QCCU 960WR.
There is a warning light on the QCCU for each of the faults. The related
light (PRESSURE, COMPUTER OR TEMPERATURE) comes on when a fault occurs.
If the fault is corrected, the light stays on until the QCCU is reset or the
power is switched off.
The QCCU 960WR has a 'TEST' pushbutton to make the lighttest on the unit.
NOTE : Before you do a test, you must pull out the door-stops and turn them
____ through 90 degrees. This makes sure that the oxygen masks do not fall out.
To make sure that a door latch assembly releases the door you can do a
ground test with the manual release tool.
To make sure that the pneumatic latches operates correctly you can do a
functional test with the MAN ON pushbutton switch.
After a functional test you must also release the pressure from the system
through the bleed/vent valve.
After a test you must close the doors turn the door-stops through 90 degrees
and release them.
After a functional test you must push the 'RESET' pushbutton switch to set
the system back to normal.
CONTROL AND INDICATING - DEACTIVATION/REACTIVATION__________________________________________________
TASK 35-23-00-040-001
Check of the MAN MASK pushbutton when the HI ALT system does not operate
1. Reason for the Job__________________
Refer to the MMEL TASK: 35-23-01-C)a) Passenger Oxygen Control and Indicating HI ALT LANDING Pb Sw High Altitude Control
2. Job Set-up Information______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
R No specific No specific 98A35207599000 vacuum source 1 ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE2 HOSE - ADAPTER, ALTITUDE SWITCH
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 24-41-00-861-002 24-41-00-862-002 35-23-15-000-001 Energize the Aircraft Electrical Circuits from the External PowerDe-energize the Aircraft Electrical Circuits Supplied from the External Power Removal of the Altitude Switch (16WR)
R **ON A/C 401-499,
R 35-23-00-991-006 Fig. 401
R EFF : 052-055, 057-057, 401-499, 35-23-00Page 401
R **ON A/C 052-055, 057-057, 401-499,
3. Job Set-up__________
Subtask 35-23-00-865-058
A. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU OXYGEN/PASSENGER/ACTUATION 7WR HA08 49VU OXYGEN/PASSENGER/ACTUATION 6WR HA07 49VU OXYGEN/PASSENGER/ACTUATION 5WR HA06 49VU OXYGEN/PASSENGER/ACTUATION 4WR HA05 49VU OXYGEN/PASSENGER/CTL AND WARN 3WR HA04 49VU OXYGEN/PASSENGER/CTL AND WARN 2WR HA03 49VU OXYGEN/PASSENGER/CTL AND WARN 1WR HA02
R **ON A/C 401-499,
R Subtask 35-23-00-865-061
R B. Make sure that this(these) circuit breaker(s) is(are) closed:
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