「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 235
Aug 01/05R CES
- Input Parameters Page 3 (Ref. AMM TASK 28-42-00-740-003) used with the Fuel Level Sensors Operating (Changeover) Values (Ref. P. Block 301)
- Trouble-shooting Data (Ref. P. Block 301).
NOTE : OPTIONAL TESTING:
____ Where a PSDA321-1 Test Set is available, a check can be made before a decision is made to go into or close up a fuel tank. The Test Set lets a GO/NOGO check be made of the tank mounted components and wiring from the tank wall connectors.
**ON A/C ALL
4. Fault Isolation_______________
**ON A/C 001-049, 051-061, 101-105, 201-203,
A. Procedure
(1) Do the steps applicable to the test equipment available.
(2) Test Equipment
WARNING : WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE
_______ TEST EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT, E.G. EN50-020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
(a) If there is:
- approved test equipment available, go to Step (3)
- no approved test equipment available, go to Step (6).
(3) Get access to the tank wall connector 7509VC (for the center tank harness 17QT) in the right MLG bay (Ref. AMM TASK 32-12-00-010-001).
(4) Disconnect the free connector 7509VC-A from the receptacle 7509VC.
(5) Do a resistance check of the sensor 20QJ at the tank wall connector 7509VC between pins <B and <C (Ref. AWM 28-46-03). Make sure the resistance is between 330 and 480 ohms. If there is:
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 236
Aug 01/05R
CES
- continuity as specified, go to Step (6) R
- no continuity as specified (resistance check out of range), go to Step (9).
NOTE : The sensor status (wet or dry) and fuel/air temperature will
____ have an effect on the resistance value.
(6) Replace the FLSCU-1 (7QJ) (Ref. AMM TASK 28-46-34-000-001) and (Ref. AMM TASK 28-46-34-400-001).
(7) If the fault continues:
R (a) Get access to the tank wall connector 7509VC (for the center tank R harness 17QT) in the right MLG bay (Ref. AMM TASK 32-12-00-010-
001).
(b) Disconnect the free connector 7509VC-A from the tank wall receptacle 7509VC.
(c) Do a check (Ref. AWM 28-46-03) of the aircraft wiring (sensor input line - H) between the FLSCU-1 rack connector AB, pin 11A and the tank wall free connector 7509VC-A, pin <B.
(d) Do a check (Ref. AWM 28-46-03) of the aircraft wiring (sensor input line - L) between the FLSCU-1 rack connector AB, pin 11B and the tank wall free connector 7509VC-A, pin <C.
(e) Do a check (Ref. AWM 28-46-01) of the aircraft wiring (FLSCU-1 BITE 1 test command line) between the FLSCU-1 rack connector AA, pin 15B and the FQIC rack connector AB, pin 7H.
(f) Do a check (Ref. AWM 28-46-03) of the aircraft wiring (FLSCU-1 LS7 output line) between the FLSCU-1 rack connector AB, pin 3A and the FQIC rack connector AB, pin 7G.
R (g) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-R 00-00).
(h) Connect the free connector 7509VC-A to the tank wall receptacle 7509VC.
(i) Do the test given in Para. 3.B.
(8) If the fault continues, do a test (Ref. AWM 28-46-01) with a multimeter to see if 28VDC is available at the FLSCU-1 (7QJ) rack connector AA, pin 1B.
(a) If the 28VDC is available:
- go to step (9).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-061, 101-105, 201-203, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 237
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(b) If the 28VDC is not available:
1_ Do a check of the aircraft wiring (Ref. AWM 28-46-01) between
- the FLSCU-1 (7QJ) rack connector AA, pin 1B and the C/B-1QJ.
R 2_ Repair all the unserviceable wiring and connectors (Ref. ESPM
R 20-00-00).
3_ Do the test given in Para. 3.B.
R (9) If the fault continues or if there is no continuity in Step (5):
R (a) Drain, open and vent the tank (Ref. AMM TASK 28-10-00-910-001)
R and (Ref. AMM TASK 28-10-00-910-002).
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