All the Cabin Lights Flicker

TASK 24-21-00-810-850-A
All the Cabin Lights Flicker

1. Possible Causes

IDG [4000XU]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-21-00-730-040	System Test of the IDG Frequency (P/N 740119)
AMM 24-21-51-000-040	Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-040	Installation of the Integrated Drive Generator - IDG 1(2)
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 24-21-00-860-082-B ** ON A/C NOT FOR ALL

A. Initial Maintenance Practices
(1) Make sure that there are no fault messages related to the generators or the IDG.
(a) If there are fault messages related to the generators or the IDG, do the related trouble shooting procedures.

NOTE: The procedures that follow are applicable if there are no BITE or other fault messages related to the aircraft power supply.

(2) Start engine 2 AMM 71-00-00-710-003.
(3) Make sure that the related aircraft electrical circuits are energized from engine 2 AMM 24-41-00-861-002.
(4) Make sure that the aircraft external power stays available.

Subtask 24-21-00-710-098-B ** ON A/C NOT FOR ALL

B. Test
(1) Do the system test of the IDG frequency AMM 24-21-00-730-040.
(2) Adjust the engine 2 power to make it stable at 75 per cent of N2.
(3) On the ECAM control panel, push the ELEC key (on the lower ECAM DU the ELEC page comes into view).
(4) Apply sufficient electrical load on IDG 2 to cause between a 40 per cent and a 55 per cent of load indication on the lower ECAM page.
(5) Keep these engine power and electrical load conditions for approximately ten minutes.
(6) Monitor the IDG 2 AC frequency on the lower ECAM DU.

NOTE: The AC frequency is between 398 Hz and 402 Hz during the last ten seconds of this period of ten minutes. If the AC frequency is not in these limits, it is possible that IDG 2 does not operate correctly.

(7) Adjust the engine 2 power to idle quickly.
(8) Adjust the engine 2 power to make it stable at 75 per cent of N2.
(9) Adjust the engine 2 power to idle.

4. Fault Isolation
Subtask 24-21-00-865-050-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	CAB LIGHT PWR-WINDOW-AFT	302LG	H04
** ON A/C NOT FOR ALL
2000VU	CAB LIGHT PWR-CEILING-AFT	307LG	H08
2000VU	CAB LIGHT PWR-CEILING-AFT	304LG	H07
2000VU	CAB LIGHT PWR-CEILING-FWD	306LG	H06
2000VU	CAB LIGHT PWR-CEILING-FWD	305LG	H05
2000VU	CAB LIGHT PWR-WINDOW-AFT	301LG	H03
2000VU	CAB LIGHT PWR-WINDOW-FWD	303LG	H02
2000VU	CAB LIGHT PWR-WINDOW-FWD	300LG	H01
2000VU	LIGHT-CABIN-ENTRY	308LG	J02
** ON A/C NOT FOR ALL
2000VU	CABIN LIGHT POWER-WINDOW AFT	302LG	H04

Subtask 24-21-00-810-115-B ** ON A/C NOT FOR ALL

B. If the cabin lights flicker:
(1) Open the circuit breakers that follow:

307LG
304LG
306LG
305LG
302LG
301LG
303LG
300LG
308LG.

(2) Close the circuit breakers that follow:

307LG
304LG
306LG
305LG
302LG
301LG
303LG
300LG
308LG.

(3) Do the test given in Para. 3.B.

Subtask 24-21-00-810-116-B ** ON A/C NOT FOR ALL

C. If the cabin lights do not flicker:
(1) A one-time transient in the IDG 2 AC power-output, that was not sufficient to give a BITE message caused the start of the first flicker sequence:

Go to Para. 5.

NOTE: No more trouble shooting is necessary.

Subtask 24-21-00-810-117-B ** ON A/C NOT FOR ALL

D. If the cabin lights continue to flicker:
(1) Make sure that the external electrical power is connected to the aircraft AMM 24-41-00-861-002.
(2) Do a manual switch-over and energize AC buses 212XP and 214XP from the external power supply-unit AMM 24-41-00-861-002.
(3) Open the circuit breakers that follow:

307LG
304LG
306LG
305LG
302LG
301LG
303LG
300LG
308LG.

(4) Close the circuit breakers that follow:

307LG
304LG
306LG
305LG
302LG
301LG
303LG
300LG
308LG.

(5) If the cabin lights continue to flicker:

Do a manual switch-over and energize AC buses 212XP and 214XP from generator 2 AMM 24-41-00-861-002.
Replace the external power supply-unit AMM 24-41-00-861-002 and AMM 24-41-00-861-002.
Do Steps (2) thru (4) again.

(6) If the cabin lights do not flicker:

Stop engine 2 AMM 71-00-00-710-028.
De-energize the aircraft electrical circuits AMM 24-41-00-861-002.
Replace IDG 2 IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(7) Do the test given in the Para. Fault Confirmation.

5. Close-up
Subtask 24-21-00-860-083-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.

[Rev.8 from Aug 2018] 2026.04.04 04:26:34 UTC