(5) Do a check of the HARNESS-CHAN A, L WING TK INR (13QT1) (HARNESS-CHAN A, R WING TK INR (13QT2)) (Ref. AWM 28-42-05) ((Ref. AWM 28-42-04)) and replace, if necessary, (Ref. AMM TASK 28-42-43-000-006) and (Ref. AMM TASK 28-42-43-400-006).
(6) If the harness 13QT1(2) is serviceable, replace the CADENSICON-RIB 2-3, L WNG TK INR GROUP A (19QT1) (CADENSICON-RIB 2-3, R WNG TK INR GROUP A (19QT2)) (Ref. AMM TASK 28-42-16-000-001) and (Ref. AMM TASK 28-42-16-400-001).
NOTE : Make sure that the cadensicon transit pin is removed.
____
NOTE : If the L(R) cadensicon sensor is replaced, 1500kg (3300lb) of
____ fuel must be put in the L(R) wing inner cell before you can fully test the cadensicon.
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).
(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) CADENSICON 19QT1(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) CADENSICON 19QT1(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).
「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, ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page 222
201-299, 401-499, Aug 01/05 CES (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 its related fuel probes, in parallel
- the drive return wire also divides to connect to each of its
related fuel probes, in parallel through a fuse. All of the discrete drive and drive return wires then go to the tank wall connector 4039VC1(2)-A. Diodes located in the terminal housing of the fuel probe half wave rectify the output signal. The negative going, dc current signal (in proportion to the capacitance value/permittivity of the fuel because this sensor is normally always covered with fuel) is routed directly from the tank wall connector 4039VC1(2)-A to the FQIC rack connector. Four wires connect the density section of the cadensicon to the tank wall connector 4039VC1(2). These four wires are also routed directly from the tank wall connector 4039VC1(2)-A to the FQIC rack connector.
(6) Use a multimeter to do a check for continuity, of the related in line fuse (Ref. ASM 28-42/05) ((Ref. ASM 28-42/06)) between the pins K and
L.
(7) If the continuity test shows:
(a) The fuse has continuity (serviceable), install the serviceable fused connector and continue with step (8).
(b) The fuse is open circuit (first time unserviceable):
1 Replace the fused connector 4041VC-A(4042VC-A) with a
_
serviceable item.
2 Do the test given in Para. 3.B.
_
(c) The fuse is open circuit (second time unserviceable):
1 Continue with step (8), only replace the fused connector
_ 4041VC-A (4042VC-A) when the cause of the short corcuit has been identified and corrected.
「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, ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page 223
201-299, 401-499, Aug 01/05 CES
(8) Get access to the tank wall connector 4039VC1(2)-A and the fused connector 4041VC-A(4042VC-A) (Ref. AMM TASK 28-42-43-000-008).
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