- PROX SW-HANDLE, AFT CARGO COMPT DOOR (34WV)
- PROX SW-FRAME, FWD CARGO COMPT DOOR (30WV)
- PROX SW-FRAME, AFT CARGO COMPT DOOR (32WV)
- SW-LOCKING SHAFT (5MJ)
- SW-LOCKING SHAFT (12MJ)
- LGCIU-1 (5GA1)
- LGCIU-2 (5GA2)
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific inductance meter
No specific multimeter
No specific 50Vdc isolation tester
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2) AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2) AMM 32-31-73-820-008 Inductance Check of the Proximity Sensors/Switches AMM 52-31-00-710-001 Operational Test of the FWD Cargo-Compartment Door AMM 52-32-00-710-001 Operational Test of the AFT Cargo-Compartment Door AMM 52-35-13-400-002 Installation of the Proximity Switches 5MJ and 12MJ AMM 52-71-12-000-001 Removal of the Proximity Switches 28WV and 34WV AMM 52-71-12-400-001 Installation of the Proximity Switches 28WV and 34WV AMM 52-71-12-400-002 Installation of the Proximity Switches 30WV and 32WV
「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 : ALL ∞∞32-31-00∞∞∞∞∞∞∞∞∞∞Page A279
Aug 01/05R CES
3. Fault Confirmation
__________________
A. Test
(1) Do an operational test of the applicable cargo door (Ref. AMM TASK 52-31-00-710-001) or (Ref. AMM TASK 52-32-00-710-001):
- if the cargo door does not operate, or the symbol on the DOOR/OXY page stays amber, do the fault isolation procedure in Para. 4.A.
- if the cargo door operates correctly and the symbol on the DOOR/OXY page goes green, no more maintenance work is necessary.
NOTE : The LGCIU only monitors the target position (TGT POS) of
____ proximity switches, when all the shock absorbers are extended. The BITE test can not identify a TGT POS fault condition. Ground Scanning can show TGT POS messages, if all the shock absorbers are extended.
4. Fault Isolation
_______________
A. Procedure
(1) For the applicable proximity-switch shown on the Post Flight Report (PFR), do the inspection of the clearance between the proximity-sensor and its target:
- for proximity-switches PROX SW-HANDLE, FWD CARGO COMPT DOOR (28WV) or PROX SW-HANDLE, AFT CARGO COMPT DOOR (34WV), (Ref. AMM TASK 52-71-12-400-001)
- for proximity-switches PROX SW-FRAME, FWD CARGO COMPT DOOR (30WV) or PROX SW-FRAME, AFT CARGO COMPT DOOR (32WV), (Ref. AMM TASK 52-71-12-400-002)
- for proximity-switches SW-LOCKING SHAFT (5MJ) or SW-LOCKING SHAFT (12MJ), (Ref. AMM TASK 52-35-13-400-002).
(a) If the fault continues do step (2).
(2) Use an inductance meter and do an inductance check of the applicable proximity-sensor (Ref. AMM TASK 32-31-73-820-008):
- if the inductance value is not correct, do step (5)
- if the inductance value is correct, do step (3).
NOTE : It is good practice to check the inductance of the other two
____ proximity-sensors related to the applicable cargo door and replace those proximity-sensors that are not in specification.
(3) Use a multimeter and do a check of the resistance of the applicable proximity-sensor shown on the PFR:
(a) Measure the resistance between pins A and B, which must be approximately 12 ohms for the ABS0121-10 and ABS0121-31 proximity-sensors, or 19 ohms for the ABS0121-40 proximity-sensor:
- if the resistance value is not correct do step (5)
Aug 01/05R CES
- if the resistance value is correct, do step (4).
(4) Use a 50Vdc isolation tester and do a check of the circuit-isolation of the applicable proximity-sensor, shown on the PFR:
(a) Connect the pins A and B together.
(b) Measure the resistance between pins AB and the case of the proximity-sensor, which must be more than 400 Megohms:
- if the resistance value is not correct do step (5)
- if the resistance value is correct, do step (6).
NOTE : The test signal is supplied for 5 seconds before the
____
resistance value is read.
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