(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 7512VC (for the center tank harness 18QT) in the right MLG bay (Ref. AMM TASK 32-12-00-010-001).
(4) Disconnect the free connector 7512VC-A from the receptacle 7512VC.
(5) Do a resistance check of the sensor 22QJ at the tank wall connector 7512VC between pins <B and <C (Ref. AWM 28-46-09). Make sure the resistance is between 330 and 480 ohms. If there is:
- continuity as specified, go to Step (6)
「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 A292
Aug 01/05R
CES
- 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-2 (9QJ) (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 7512VC (for the center tank R harness 18QT) in the right MLG bay (Ref. AMM TASK 32-12-00-010-
001).
(b) Disconnect the free connector 7512VC-A from the receptacle 7512VC.
(c) Do a check (Ref. AWM 28-46-09) of the aircraft wiring (sensor input wire - H) between the FLSCU-2 rack connector AB, pin 12A and the tank wall free connector 7512VC-A, pin <B.
(d) Do a check (Ref. AWM 28-46-09) of the aircraft wiring (sensor input wire - L) between the FLSCU-2 rack connector AB, pin 12B and the tank wall free connector 7512VC-A, pin <C.
(e) Do a check (Ref. AWM 28-46-06) of the aircraft wiring (FLSCU-2 BITE 2 test command wire) between the FLSCU-2 rack connector AA, pin 15A and the FQIC rack connector AB, pin 8K.
(f) Do a check (Ref. AWM 28-46-09) of the aircraft wiring (FLSCU-2 LS6 output wire) between the FLSCU-2 rack connector AB, pin 2B and the FQIC rack connector AB, pin 11K.
R (g) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-R 00-00).
(h) Connect the free connector 7512VC-A to the tank wall receptacle 7512VC.
(i) Do the test given in Para. 3.B.
(8) If the fault continues, do a test (Ref. AWM 28-21-08) with a multimeter to see if 28VDC is available at the FLSCU-2 (9QJ) rack connector AA, pin 1D.
(a) If the 28VDC is available:
- go to step (9).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 001-049, 051-061, 101-105, 201-203, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A293
May 01/05 CES
(b) If the 28VDC is not available:
1_ Do a check of the aircraft wiring (Ref. AWM 28-21-08) between:
- the FLSCU-2 (9QJ) rack connector AA, pin 1D and the
C/B-32QA.
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).
R
R (b) Do a wiring check of the HARNESS-CHAN B, CTR TK (18QT) (Ref. AWM
R 28-46-09) and replace, if necessary (Ref. AMM TASK 28-42-44-000-
R 001) and (Ref. AMM TASK 28-42-44-400-001).
R (c) If the harness is serviceable, replace the SENSOR-LOW LVL, R CTR
TK CHANNEL B (22QJ) (Ref. AMM TASK 28-46-15-000-004) and (Ref.
AMM TASK 28-46-15-400-012).
**ON A/C 301-399,
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.
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