- 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 connector 4040VC1(2)-A. Diodes located in the terminal housing of the fuel probe half wave rectify the output signal. The positive going, dc current signal (in proportion to the capacitance value/fuel height from the fuel probe) is routed directly
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from the tank wall connector 4040VC1(2)-A to the FQIC rack connector.
1_ 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:
- FQIC rack connector 3QT-A, pins 4H(4C), 7G(7A) and 5F(4D)
- 92VU shelf receptacle 210VC (214VC) and connector
210VC-A(214VC-A)
- receptacle 1970VC (1521VC) and connector 1970VC-A(1521VC-A)
- receptacle 2973VC and connector 2973VC-A (right wing only)
- receptacle 7155VC(7110VC) and connector 7155VC-A(7110VC-A)
- pressure seal feedthrough 4017VP(4016VP)
- shorting plug 4043VC-A(4044VC-A) and receptacle
4043VC(4044VC)
- connector 4040VC1(2)-A, pins BB, CC and <Q
- 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 28-42-11) ((Ref. AWM 28-42-10)):
- FQIC rack connector 3QT-A, pin 4H(4C) to connector
4040VC1(2)-A, pin BB (probe 14 signal)
- FQIC rack connector 3QT-A, pin 7G(7A) to connector
4040VC1(2)-A, pin CC (common drive return)
- FQIC rack connector 3QT-A, pin 5F(4D) to connector
4040VC1(2)-A, pin <Q (common drive).
(d) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).
(e) Connect the:
- shorting plug 4043VC-A(4044VC-A) to the receptacle 4043VC(4044VC) (Ref. AMM TASK 28-42-43-400-008)
- tank wall connector 4040VC1-A(4040VC2-A) to the receptacle 4040VC1(4040VC2).
(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).
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CES
(5) Do a check of the HARNESS-LEFT WING TANK B (63QT) (HARNESS-RIGHT WING TANK B (64QT)) (Ref. AWM 28-42-13) ((Ref. AWM 28-42-12)) 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 63QT (64QT) is serviceable, replace the PROBE-FUEL QTY NO 14, RIB 20-21 L WNG TK OUTR GROUP B (34QT1) (PROBE-FUEL QTY NO 14, RIB 20-21 R WNG TK OUTR GROUP B (34QT2)) (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).
(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 34QT1(2) is not shown:
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本文链接地址：A320 Trouble Shooting Manual 排故手册 FUEL 燃油3(16)
