(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).

 「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 240
 Aug 01/05 CES

 (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 fused adaptor 7509VC-B 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:

 - continuity as specified, go to Step (6)

 - 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:

 (a) 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).

 (b) Disconnect the fused adaptor 7509VC-B 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 fused adaptor 7509VC-B, 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 fused adaptor 7509VC-B, pin <C.

 (e) If necessary, replace the fused adaptor at 7509VC.

 NOTE : The FLSS sensor connections through the adaptor are not
____
 fused.

 (f) 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.

 (g) 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.

 「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, 051-099, 101-149, 151-199, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 241
 201-299, 401-499, Aug 01/05 CES

 (h) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).

 (i) Install the fused adaptor between the tank wall receptacle 7509VC and free connector 7509VC-A.

 (j) 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).

 (b) If the 28VDC is not available:

 (9) If the fault continues or if there is no continuity in Step (5):

 (a) Drain, open and vent the tank (Ref. AMM TASK 28-10-00-910-001) and (Ref. AMM TASK 28-10-00-910-002).

 (b) Do a wiring check of the HARNESS-CHAN A, CTR TK (17QT) (Ref. AWM 28-46-03) and replace, if necessary (Ref. AMM TASK 28-42-44-000-001) and (Ref. AMM TASK 28-42-44-400-001).

 (c) If the harness is serviceable, replace the SENSOR-HIGH LEVEL, CENTER TANK (20QJ) (Ref. AMM TASK 28-46-15-000-004) and (Ref. AMM TASK 28-46-15-400-012).

 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.
 2_ Repair all the unserviceable wiring and connectors (Ref. ESPM
 20-00-00).
 3_ Do the test given in Para. 3.B.

 「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, 051-099, 101-149, 151-199, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page 242
 201-299, 401-499, Aug 01/05 CES

 **ON A/C ALL

 TASK 28-46-00-810-806
　
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