- SFCC-1 (21CV)
- SFCC-2 (22CV)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-21-00-810-813 Fuel Pumps - Center Tank Fuel Pump No. 1 (Left Side) 37QA System Malfunction 28-21-00-810-814 Fuel Pumps - Center Tank Fuel Pump No. 2 (Right Side)
38QA System Malfunction
AMM 27-51-34-000-001 Removal of the SFCC (21CV,22CV)
AMM 27-51-34-400-001 Installation of the SFCC (21CV,22CV)
AMM 27-80-00-866-004 Extending the Slats on the Ground
AMM 27-80-00-866-005 Retracting the Slats on the Ground
AMM 28-21-00-720-001 Functional Test of the Center-Tank Fuel Control
ASM 28-21/03
ASM 28-21/04
3. Fault Confirmation
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A. Test
(1) Do the Functional Test of the Center-Tank Fuel Control (Ref. AMM TASK 28-21-00-720-001), where it is applicable to Auto Mode operation:
- if the two center tank pumps operate correctly, in auto mode, no more maintenance work is necessary
- if one center tank pump only does not operate correctly, do the applicable trouble shooting procedure (Ref. TASK 28-21-00-810-813) or (Ref. TASK 28-21-00-810-814)
- if the two center tank pumps do not operate correctly, do the fault isolation procedure in Para. 4.A.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page A257
201-299, 401-499, Aug 01/05 CES 4. Fault Isolation
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A. Procedure
NOTE : During AUTO mode, the two center tank pumps must not operate when
____
the slats are extended to 16 degrees, or more.
(1) Make sure that the flaps are set to the same condition as when the fault occured. If necessary extend (Ref. AMM TASK 27-80-00-866-004) or retract (Ref. AMM TASK 27-80-00-866-005) the flaps.
(2) At the overhead FUEL panel:
(a) Make sure that:
- the P/BSW-CTR TK/MODE SEL/AUTO (48QA) is set to AUTO (MAN light is off) (Ref. ASM 28-21/04)
- the P/BSW-FUEL/CTR TK/PUMP 1 (33QA) is set to ON (Ref. ASM 28-21/03)
- the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) is set to ON (Ref. ASM 28-21/03).
(b) Loosen the panel-fastners and pull down the panel, to get access to the rear of the panel.
(c) Do a check for 28 VDC at pin B1 and B3 of P/BSW-CTR TK/MODE SEL/AUTO (Ref. ASM 28-21/04):
- if 28VDC is at pin B3, do step (4)(a)
- if 28VDC is not at pin B1, do step (4)(b)
- if 28VDC is at pin B1, but not pin B3, do the next step.
(3) Replace the P/BSW-CTR TK/MODE SEL (48QA).
(a) Make sure there is 28VDC at pin B1 and pin B3.
(b) Do the test in Para. 3.A.:
- if the fault continues, do the next step.
(4) From the result of the voltage checks in step (2)(c):
(a) If 28VDC is at pin B3, do a check and replace as necessary the wiring/connectors between pin B3 and terminal block 202VT (Ref. ASM 28-21/04).
(b) If 28VDC is not at pin B1, do a check and replace as necessary the wiring/connectors between pin B1 and C/B FUEL/CTR TK/AUTO/CTL (47QA) (Ref. ASM 28-21/04).
(5) Put the overhead FUEL panel back to its original condition.
(a) Do the test in Para. 3.A.:
- if the fault continues, do the next step.
「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, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page A258
201-299, 401-499, Aug 01/05 CES
(6) Replace SFCC-1 (21CV) (Ref. AMM TASK 27-51-34-000-001) and (Ref. AMM TASK 27-51-34-400-001), then do the next step.
NOTE : When the slats are extended to more than 16 degrees, the
____ SFCC-1 and SFCC-2 each supply a ground to the center tank fuel pumps auto control relays. If one SFCC does not supply a ground, this fault will not show until the opposite SFFC or wiring becomes unserviceable. Thus if this ground is not supplied there must two faults, one in each SFCC or its related wiring.
(7) Do a check and replace as necessary the wiring/connectors between
terminal block 1853VT and the two SFFCs (Ref. ASM 28-21/04):
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