8. Test
____
The high-level sensors and their circuits are tested from the refuel/defuel panel 800VU, with the TEST switch (2QJ). The same switch also has a filament test facility. The Fuel Quantity Indicating System (FQIS) (Ref. 28-42-00) computer controlled Built-In Test Equipment (BITE) has test facilities for all the sensors and their circuits. When BITE is operated, with a failure-monitoring-signal, the Centeralized Fault Display System (CFDS) (Ref. 31-30-00) will show and identify a:
-
defective sensor and/or
-
defective control-unit.
1EFF : ALL 1 28-46-00Page 46 1 1 May 01/04 1 1 1CES 1 TANK LEVEL SENSING - ADJUSTMENT/TEST
____________________________________
TASK 28-46-00-710-001
Test of the Tank High Level Sensing System
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______
START A TASK ON OR NEAR:
-
THE FLIGHT CONTROLS
-
THE FLIGHT CONTROL SURFACES
-
THE LANDING GEAR AND THE RELATED DOORS
-COMPONENTS THAT MOVE.
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
GEAR.
1. Reason for the Job
__________________
To test at the refuel/defuel panel 800VU the:
-HI LVL lights (lamp check)
-high level sensors in the fuel tanks
-FLSCU 7QJ(9QJ) (high level channels).
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific safety barriers
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 28-00-00-910-001 Fuel Safety Procedures R 31-60-00-860-002 EIS Stop Procedure
1EFF : ALL 1 28-46-00Page 501 1 1 Aug 01/00 1 1 1CES 1 1EFF : ALL 1 28-46-00Page 502 1 1 Aug 01/00 1 1 1CES 1
3. Job Set-up__________
Subtask 28-46-00-941-054
A. Safety Precautions
WARNING : OBEY THE FUEL SAFETY PROCEDURES._______
(1) Put the safety barriers in position.
(2) You must obey the fuel safety procedures (Ref. TASK 28-00-00-910-001)
when you do work on the fuel system.
R Subtask 28-46-00-010-052-A
R B. Get Access
R (1) Open the access door 192MB to energize the refuel/defuel control
R panel.
R NOTE : Do not keep the door open longer than necessary with the MODE____
R SELECT switch in the REFUEL position because the battery can
R discharge.
R Subtask 28-46-00-860-054-A
R C. Aircraft Maintenance Configuration
R WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED_______
R BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
R (1) Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-
R 002).
R (2) If you do not have ground power available, on the refuel/defuel panel
R 800VU, put the BATT POWER switch to the ON position.
R NOTE : HOT BUSS 701PP is energized for ten minutes only to prevent____
R discharge of the aircraft batteries, unless you put the MODE
R SELECT switch to REFUEL.
4. Procedure
_________ Subtask 28-46-00-710-053 R A. Test of the HI LVL Lights
(1) Do the steps given below:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the panel 800VU:
R - set the REFUEL VALVES switches R to the NORM and guarded R position R - set the MODE SELECT switch to R the OFF position
-hold the TEST switch in the LTS position
-release the TEST switch.
Subtask 28-46-00-710-054
B. High Level Sensing System TestOn the panel 800VU:
-
if the HI LVL lights were off theycome on
-
if the HI LVL lights were on they stay on
-
if the HI LVL lights came on they go off
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