- 92VU shelf receptacle 214VC (210VC) and connector 214VC-A(210VC-A)
- receptacle 1521VC (1970VC) and connector 1521VC-A(1970VC-A)
- receptacle 2973VC and connector 2973VC-A (left wing only)
- receptacle 7107VC(7154VC) and connector 7107VC-A(7154VC-A)
- pressure seal feedthrough 4015VP(4018VP)
- shorting plug 4041VC-A(4042VC-A) and receptacle 4041VC(4042VC)
- connector 4039VC1(2)-A, pins U, <N and T
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- adjacent and related connecting wires.
2 Electrical Tests
_ Do a continuity test (Ref. ESPM 20-52-21) and a test for a short circuit (Ref. ESPM 20-52-22) of the wires that follow (Ref. AWM 28-42-07) ((Ref. AWM 28-42-06)):
- FQIC rack connector 3QT-A, pin 1C(1J) to connector 4039VC1(2)-A, pin U (probe 5 signal)
- FQIC rack connector 3QT-A, pin 3C(3H) to connector 4039VC1(2)-A, pin <N (common drive return)
- FQIC rack connector 3QT-A, pin 1E(2G) to connector 4039VC1(2)-A, pin T (common drive).
(d) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).
(e) Connect the:
- shorting plug 4041VC-A(4042VC-A) to the receptacle 4041VC(4042VC) (Ref. AMM TASK 28-42-43-400-008)
- tank wall connector 4039VC1-A(4039VC2-A) to the receptacle 4039VC1(4039VC2).
(f) Install the initial FQIC 3QT (Ref. AMM TASK 28-42-34-400-001).
(g) Do the test given in Para. 3.B.
(4) If the fault continues, drain and open the tank to the air (Ref. AMM TASK 28-10-00-910-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Do a check of the HARNESS-LEFT WING TANK A (57QT) (HARNESS-RIGHT WING TANK A (58QT)) (Ref. AWM 28-42-07) ((Ref. AWM 28-42-06)) and replace, if necessary, (Ref. AMM TASK 28-42-43-000-005) and (Ref. AMM TASK 28-42-43-400-005).
(6) If the harness 57QT (58QT) is serviceable, replace the PROBE-FUEL QTY NO 5, RIB 2-3 L WNG TK INR GROUP A (25QT1) (PROBE-FUEL QTY NO 5, RIB 2-3 R WNG TK INR GROUP A (25QT2)) (Ref. AMM TASK 28-42-15-000-005) and (Ref. AMM TASK 28-42-15-400-005).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Post SB 28-1087 For A/C 001-049,051-061,101-105,201-203,
A. Procedure
NOTE : Where applicable, to show the difference between the left and
____ right wing installations, the FINs given in this procedure are written as follows:
- the left wing, no parenthesis, FIN
- the right wing, in parenthesis, (FIN).
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(1) Temporarily replace the FQIC 3QT with a serviceable item (Ref. AMM TASK 28-42-34-000-001) and (Ref. AMM TASK 28-42-34-400-001).
NOTE : The step (1) has been included because it is important to make
____ sure that the FQIC is serviceable before you start more steps.
(2) If the message L(R) QTY PROBE 25QT1(2) is not shown:
- complete the installation of the FQIC (3QT) (Ref. AMM TASK 28-42-34-000-001) and (Ref. AMM TASK 28-42-34-400-001).
(3) If the message L(R) QTY PROBE 25QT1(2) is shown:
(a) Remove the temporary installed serviceable FQIC 3QT (Ref. AMM TASK 28-42-34-000-001) and return it to stores.
(b) Install the initial FQIC 3QT (Ref. AMM TASK 28-42-34-400-001).
(4) Get access to the fused connector 4041VC-A (4042VC-A) (Ref. AMM TASK 28-42-43-000-008).
(5) Remove the fused connector 4041VC-A (4042VC-A).
NOTE : Each capacitive fuel probe is supplied with an alternating
____ current drive, of 30 volts at 30 kilo-hertz, from the FQIC. The fuel probes in a tank group (harness) share the drive and drive return (two aircraft wires) between the FQIC rack connector and the fused connector 4041VC-A (4042VC-A). The fused connector is adjacent to and below its related tank wall connector. In the fused connector:
- the drive wire divides to supply each of the related fuel probes, in parallel
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