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 4. Fault Isolation
_______________
 A. Procedure
 NOTE : The dualcomp 53QT contains two capacitive sensors and their
____ related circuitry. It is located in the left-wing fuel-tank between Ribs 1 and 2. It is mounted on a support bracket, adjacent to the rear spar, just above the fuel tank floor. In normal operation with a fuel load it is fully below the surface of the fuel. The output signals from the dualcomp are DUALCOMP SIGNAL A and DUALCOMP SIGNAL B and are proportional to the dieletric permittivity of the fuel.
 (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 DUALCOMP 53QT or L DUALCOMP 53QT/WRG 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 DUALCOMP 53QT or L DUALCOMP 53QT/WRG is shown:

 (a) Remove the temporary installed serviceable FQIC 3QT (Ref. AMM TASK 28-42-34-000-001) and return it to stores.

 (b) Get access (Ref. AMM TASK 28-42-43-000-008) to the:

 - tank wall connectors 4039VC1-A and 4040VC1-A

 - shorting plugs 4041VC-A and 4043VC-A.

 

 

 1 Disconnect the:
_
 - tank wall connectors 4039VC1-A and 4040VC1-A

 - shorting plugs 4041VC-A and 4043VC-A.

 「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 : 301-399, ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page C207
 Aug 01/05 CES

 (4) Do a visual inspection and electrical tests of the aircraft wiring (Ref. AWM 28-42-05), (Ref. AWM 28-42-11) and (Ref. AWM 28-42-13) between the FQIC rack connector 3QT-A and the tank wall connectors 4039VC1-A and 4040VC1-A as follows:
 NOTE : Each capacitive fuel probe is supplied with an alternating
____ current drive 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 connectors 4041VC-A and 4043VC-A. The connectors 4041VC-A and 4043VC-A are adjacent to and below their related tank wall connectors 4039VC1-A and 4040VC1-A. In the connectors 4041VC-A and 4043VC-A (shorting plugs):
 - the drive wire divides to supply each of the related fuel probes, in parallel

 - the drive return wire also divides to connect to each of the related fuel probes,in parallel. All of the discrete drive and drive return wires then go to the tank wall connectors 4039VC1-A and 4040VC1-A. Diodes located on a circuit card assembly in the dualcomp half wave rectify the output signals. The positive going, dc current signals (in proportion to the capacitance value/fuel dielectric permittivity) are routed directly from the tank wall connectors 4039VC1-A and 4040VC1-A to the FQIC rack connector. The drive inputs and signal outputs from:

 - dualcomp A are routed to the FQIC 3QT through the left wing wiring group A

 - dualcomp B are routed to the FQIC 3QT through the left wing wiring group B.

 (a) Visual Inspection Make sure that good lighting is available. Do a visual inspection and look for distortion (bent, pinched or stretched), damage (broken, chafed or cut), discoloration, overheating (burnt, melted or arcing), liquid contamination, loose electrical connection, or incorrect assembly of the items that follow:
 Left Wing Group A (Ref. AWM 28-42-05)
 - FQIC rack connector 3QT-A, pins 1D, 3C and 1E

 - 92VU shelf receptacle 214VC and connector 214VC-A

 - receptacle 1521VC and connector 1521VC-A

 - receptacle 2973VC and connector 2973VC-A

 - receptacle 7107VC and connector 7107VC-A

 - pressure seal feedthrough 4015VP

 - shorting plug 4041VC-A and receptacle 4041VC

 - connector 4039VC1-A, pins <Z, GG and AA

 - adjacent and related connecting wires

 - FQIC rack connector 3QT-A, pins 4J, 7G and 5F

 Left Wing Group B (Ref. AWM 28-42-11) and (Ref. AWM 28-42-13)
 「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 : 301-399, ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page C208
 Aug 01/05R CES

 - 92VU shelf receptacle 210VC and connector 210VC-A

 - receptacle 1970VC and connector 1970VC-A

 - receptacle 7155VC and connector 7155VC-A

 - pressure seal feedthrough 4017VP

 - shorting plug 4043VC-A and receptacle 4043VC
　
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