NOTE : As the GEN 1 was set to OFF because of a true failure, the fault
____
confirmation is not necessary.
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4. Fault Isolation
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A. If the fault symptom is identified by the CFDS message CHECK CT 42XU1 42XU3 GCU 1 PIN B11A TO B11D WIRING and the upper ECAM DU warning GEN 1 FAULT:
- Do a check of the wiring for open circuit between respectively: . the pins A/1, A/2, A/3, A/4 of the current transformer 42XU3 and respectively: .. the pins B/11A, B/11B, B/11C, B/11D of the GCU 1, .. the pins A/1, A/2, A/3, A/4 of the current transformer 42XU1, . the pins A/1, A/6, A/7, A/8 of the IDG 1 to respectively the pins B/13D, B/13A, B/13B, B/13C of the GCU 1 (Ref. ASM 24-22/01).
(1) If there is no continuity:
- repair the above wiring.
(2) If the wiring is correct: Do an impedance check of the coils of the current transformers 42XU1 and 42XU3 between pin A/4 and successively pins A/1, A/2 and A/3.
NOTE : The normal impedance is 10.15 Ohms plus or minus 3.45 Ohms.
____
(a) If the impedance is out of tolerance:
- replace the defective current transformer (Ref. AMM TASK 24-22-17-000-001) and (Ref. AMM TASK 24-22-17-400-001).
(b) If the impedance is correct:
- Make sure, on current transformers 42XU1 and 42XU3 that the pin A/6 is electrically insulated from pins A/1, A/2, A/3 and A/4.
1 If not insulated:
_
- replace the defective current transformer (Ref. AMM TASK 24-22-17-000-001) and (Ref. AMM TASK 24-22-17-400-001).
2 If insulated:
_
- Do an impedance check of the coil of the IDG 1 current transformer from the pin A/1 to succesively pins A/6, A/7 and A/8.
NOTE : The normal impedance is 26 Ohms plus or minus 2 Ohms at
____
25.C.
a if the impedance is out of tolerance:
_ . replace the IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040).
b if the impedance is correct:
_
- . replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).
「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, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 255
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B. Do this operational test to make sure that the system operates correctly.
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
(2) On the ELEC panel 35VU:
- push, release and push again the GEN 1 pushbutton switch (3XU1).
(3) Do the operational test of the GPCU (Ref. AMM TASK 24-41-00-740-002).
(4) Start the engine 1 (Ref. AMM TASK 71-00-00-710-003).
C. Do this test:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
On the ECAM control panel: On the lower ECAM display unit:
- get the ELEC page. - the correct electrical parameters of GEN 1 are shown and AC 1 busbar is supplied by GEN 1.
5. Close-up
________
A. Put the aircraft back to its initial configuration.
(1) Stop the engine 1 (Ref. AMM TASK 71-00-00-710-028).
(2) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
「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, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 256
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TASK 24-20-00-810-822
Failure of the IDG 1
1. Possible Causes
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- IDG (4000XU)
2. Job Set-up Information
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A. Referenced Information
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