Computer Reset

TASK 24-00-00-810-818-A
Computer Reset

1. Possible Causes

2. Fault Confirmation
Subtask 24-00-00-710-059-A

A. Test
(1) Not applicable

3. Fault Isolation
Subtask 24-00-00-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/AFT CARGO/VENT/CTL & MONG	31HN	C07
49VU	AIR COND/AFT CARGO/VENT/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/SDCU/CHAN1	11WQ	C06
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/2	157RH	G02
** ON A/C ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/FCDC1/SPLY	20CE1	B10
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B08
49VU	AUTO FLT/FCU/1	9CA1	B05
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
49VU	AUTO FLT/FMGC/1	10CA1	B02
49VU	AUTO FLT/MCDU/1	11CA1	B01
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
49VU	EIS/DMC1/SPLY	10WT1	E11
49VU	FWS/FWC1/SPLY	3WW	F01
49VU	NAV/MMR/1	42RT1	G12
49VU	COM/CIDS/DIR ESS/1	150RH	G01
** ON A/C NOT FOR ALL
49VU	AIR COND/AFT CARGO/VENT & HTG/CTL & MONG	31HN	C07
49VU	AIR COND/AFT CARGO/VENT & HTG/CTL & MONG	31HN	C07
** ON A/C NOT FOR ALL
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
49VU	COM/CIDS/FLT ATTND PNL/ESS	171RH	H01
** ON A/C NOT FOR ALL
49VU	COM DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
121VU	COM NAV/MMR/2	42RT2	K09
** ON A/C NOT FOR ALL
121VU	COM /CIDS/FWD ATTND/PNL	170RH	Q14
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/PROG &/TST PNL	161RH	M07
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2/EVMU	1EV	R44
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M06
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M05
** ON A/C ALL
121VU	COM NAV/RAD ALTM/2	1SA2	K12
121VU	COM NAV/RAD ALTM/1	1SA1	K11
121VU	COM NAV/TCAS	4SG	K10
121VU	APU/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	ATSU 1	3TX1	L16
121VU	ATSU 1/SWTG	5TX1	L15
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
121VU	FUEL/FQI/CHAN/2	2QT	M27
121VU	AUTO FLT/FCU/2	9CA2	M21
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18
121VU	AUTO FLT/FMGC/2	10CA2	M17
121VU	AUTO FLT/MCDU/2	11CA2	N20
121VU	EIS/GPWS/115VAC	3WZ	P07
121VU	ENGINE/ENG2/FADEC B/AND EIU 2	4KS2	Q40
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	FLIGHT CONTROLS/FCDC2/SPLY	20CE2	Q20
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
121VU	EIS/DMC3/SPLY	10WT3	Q09
121VU	EIS/DMC2/SPLY	10WT2	Q08
121VU	EIS/FWC2/SPLY	2WW	Q07
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20
** ON A/C NOT FOR ALL
121VU	COM NAV/MMR/2	42RT2	L07
** ON A/C NOT FOR ALL
121VU	COM /CIDS/FLT ATTND/PNL	170RH	Q14
** ON A/C NOT FOR ALL
121VU	COM/FAP1/NORM	170RH	Q14
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M07
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M06
121VU	COM NAV/CIDS/FWD ATTND/PNL	170RH	Q14
** ON A/C NOT FOR ALL
122VU	AIR COND/SDCU/CHAN2	12WQ	T18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C ALL
122VU	ANTI ICE/WHC/2	5DG2	W13
122VU	ANTI ICE/WHC/1	5DG1	X13
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACUUM TOILET SYSTEM/VACUUM SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-SYS	35MG	A06

Subtask 24-00-00-810-069-A

B. Computer reset procedure

NOTE: This reset procedure is used when a computer does not operate correctly.

NOTE: The line maintenance personnel can use it a first time to avoid a computer replacement (a reset must be done for the applicable computer as indicated in the Computer Reset Table).
But, if there is more than one reset for each flight cycle for a given computer, it is necessary to do the specific troubleshooting procedure for the applicable system.
If after a reset, the computer operates correctly, no more action is necessary.

(1) To do computer reset:
(a) Set the related normal cockpit control to OFF, or open the related circuit breaker as specified in the reset procedure.
(b) Wait 3 seconds if a normal cockpit control is used, or 5 seconds if a circuit breaker is used (unless a different time is indicated).
(c) Set the related normal cockpit control to ON, or close the related circuit breaker.
(d) Wait 3 seconds for the end of the reset.

Subtask 24-00-00-810-075-C ** ON A/C NOT FOR ALL

C. Air Conditioning
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
21	CAB PR SYS 1(2) FAULT	CABIN PRESSURE CONTROLLER (CPC) 1(2)	For CPC 1: - On panel 49VU, open the circuit breaker 1HL. FOR CPC 2: - On panel 122VU, open the circuit breaker 2HL. After five seconds, close the circuit breaker.
21	COND ZONE REGUL FAULT	ZONE TEMPERATURE CONTROLLER	On panel 122VU: - Open the circuit breaker 1HK. - Open the circuit breaker 2HK. After five seconds, close the circuit breaker.
21	AIR FWD (AFT) CRG VENT FAULT	CARGO VENTILATION CONTROLLER	On panel 49VU: - Open the circuit breaker 31HN. After five seconds, close the circuit breaker.
21	VENT AVNCS SYS FAULT	AVIONICS EQUIPMENT VENTILATION COMPUTER	On panel 122VU: - Open the circuit breaker 3HQ. After five seconds, close the circuit breaker.
21	AIR PACK 1(2) REGUL FAULT	PACK CONTROLLER (PC) 1(2)	For the PC 1: - On panel 122VU, open then close the circuit breaker 2HH. For the PC 2: - On panel 122VU, open then close the circuit breaker 22HH.
21	COND AFT CRG HEAT FAULT	AFT CARGO HEAT CONTROLLER	On panel 49VU: - Open the circuit breaker 31HN. - After five seconds, close the circuit breaker.

Subtask 24-00-00-810-075-E ** ON A/C NOT FOR ALL

C. Air Conditioning
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
21	CAB PR SYS 1(2) FAULT	CABIN PRESSURE CONTROLLER (CPC) 1(2)	For CPC 1: - On panel 49VU, open the circuit breaker 1HL. FOR CPC 2: - On panel 122VU, open the circuit breaker 2HL. After five seconds, close the circuit breaker.
21	AIR FWD (AFT) CRG VENT FAULT	CARGO VENTILATION CONTROLLER	On panel 49VU: - Open the circuit breaker 31HN After five seconds, close the circuit breaker.
21	VENT AVNCS SYS FAULT	AVIONICS EQUIPMENT VENTILATION COMPUTER	On panel 122VU: - Open the circuit breaker 3HQ. After five seconds, close the circuit breaker.
21	AIR PACK 1(2) REGUL FAULT	AIR COND SYSTEM CONTROLLER (ACSC) 1(2)	For the ACSC 1: - On panel 122VU, open the circuit breaker 49HH, circuit breaker 50HH and circuit breaker 51HH. - On panel 49VU, open the circuit breaker 52HH. Then close the circuit breakers. For the ACSC2: - On panel 122VU, open the circuit breaker 53HH, circuit breaker 54HH, circuit breaker 55HH and circuit breaker 56HH. Then close the circuit breakers.
21	COND AFT CRG HEAT FAULT	AFT CARGO HEAT CONTROLLER	On panel 49VU: - Open the circuit breaker 31HN. - After five seconds, close the circuit breaker.

Subtask 24-00-00-810-076-A

D. Auto Flight
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
22	AUTO FLT YAW DAMPER 1(2) FAULT	FAC1(2)	Open these C/Bs with the Yellow and Green hydraulic systems pressurized: - for the FAC 1: on the panel 49VU, C/B 5CC1 - for the FAC 2: on the panel 121VU, C/B 5CC2 Then close the C/Bs after 10 seconds.
22	WINDSHEAR DET FAULT or REAC W/S DET FAULT	FAC 1+2	Open then close the C/Bs in this the order: - on the panel 49VU, C/B 5CC1 and C/B 14CC1 - on the panel 121VU, C/B 5CC2 and C/B 14CC2.
22	AUTO FLT FCU 1(2) FAULT	FCU	For the FCU1: - on the panel 49VU, open the C/B 9CA1. For the FCU2: - on the panel 121VU, open the C/B 9CA2. Close the C/B after 5 seconds. If the fault does not continue, do a check of the target and barometer references shown, and correct them if necessary (reset successful). If the fault continues, open again the two C/Bs 9CA1 on 49VU and 9CA2 on 121VU. Close the C/Bs after 7 min, with an interval less than 5 sec between side 1 and side 2. At least 30 sec are necessary until the end of the FCU1 and FCU2 safety test. If the fault does not continue, do a check of the target and barometer references shown, and correct them if necessary (reset successful) If the fault continues, end of procedure (reset unsuccessful).
22	One MCDU locked or blank	MCDU	Open then close the C/B of the defective MCDU after 10 seconds: - For the MCDU1: on the panel 121VU or panel 49VU, C/B 11CA1. - For the MCDU2: on the panel 121VU, C/B 11CA2. - For the MCDU3: on the panel 121VU, C/B 11CA3.
22	FMGC malfunction Both MCDUs locked or blank	FMGC FMGC	On the panel 121VU or 49VU: - open the FMGC 1 C/B 10CA1 and close it after 10 seconds. When initiated engine stopped (aircraft in maintenance configuration), the reset will be followed by a power-up test sequence of around 90 seconds. During this test sequence, the system is unavailable. If there is no reset of the FMGC 1, do a reset of the FMGC 2 on the panel 121VU: - open the C/B 10CA2 and close it after 10 seconds.

Subtask 24-00-00-810-077-B ** ON A/C NOT FOR ALL

E. Communications
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
23	COM CIDS 1+2 FAULT	CIDS	- Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH on the panel 49VU, C/B 157RH on the panel 121VU, C/B 156RH - After 10 seconds, close the C/Bs in this order: 156RH, 157RH, 151RH and 150RH.
23	Uncommanded EVAC horn actuation	CIDS	Press the EVAC/HORN SHUT OFF switch. If unsuccessful: - Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH on the panel 49VU, C/B 157RH on the panel 121VU, C/B 156RH - After 10 seconds, close the C/Bs in this order: 156RH, 157RH, 151RH and 150RH.
23	Frozen RMP	RMP	You must do a reset of all the RMPs, one after the other. On the RMP control panel: - set the ON/OFF switch to OFF - after 5 seconds, set the ON/OFF switch to ON.
23	Frozen FAP	FAP or Tape reproducer/ PRAM	On the panel 121VU, Open the FAP C/B 170RH. - After 10 seconds, close the C/B 170RH. If unsuccessful: on the panel 2000VU - open the tape reproducer /PRAM C/B 2RX. After 10 seconds, close the C/B.

Subtask 24-00-00-810-077-C ** ON A/C NOT FOR ALL

E. Communications
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
23	COM CIDS 1+2 FAULT	CIDS	- Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH - After 10 seconds, close the C/Bs in this order: 151RH, 150RH.
23	Uncommanded EVAC horn actuation	CIDS	Press the EVAC/HORN SHUT OFF switch. If unsuccessful: - Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH - After 10 seconds, close the C/Bs in this order: 151RH, 150RH.
23	Frozen RMP	RMP	You must do a reset of all the RMPs, one after the other. On the RMP control panel: - set the ON/OFF switch to OFF - after 5 seconds, set the ON/OFF switch to ON.
23	Frozen FAP	Tape reproducer	Open the C/Bs in this order: On the panel 49VU, CB 171RH On the panel 121VU, CB 170RH - After 10 seconds, close the C/Bs in this order: 170RH, 171RH If unsuccessful: on the panel 2000VU - open the tape reproducer /PRAM C/B 2RX. After 10 seconds, close the C/B.

Subtask 24-00-00-810-077-D ** ON A/C NOT FOR ALL

E. Communications
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
23	COM CIDS 1+2 FAULT	CIDS	- Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH on the panel 49VU, C/B 157RH on the panel 121VU, C/B 156RH - After 10 seconds, close the C/Bs in this order: 156RH, 157RH, 151RH and 150RH.
23	Uncommanded EVAC horn actuation	CIDS	Press the EVAC/HORN SHUT OFF switch. If unsuccessful: - Open the C/Bs in this order: on the panel 49VU, C/B 150RH on the panel 121VU, C/B 151RH on the panel 49VU, C/B 157RH on the panel 121VU, C/B 156RH - After 10 seconds, close the C/Bs in this order: 156RH, 157RH, 151RH and 150RH.
23	Frozen RMP	RMP	You must do a reset of all the RMPs, one after the other. On the RMP control panel: - set the ON/OFF switch to OFF - after 5 seconds, set the ON/OFF switch to ON.
23	Frozen FAP	FAP	Open the C/Bs in this order: On the panel 49VU, CB 171RH On the panel 121VU, CB 170RH - After 10 seconds, close the C/Bs in this order: 170RH, 171RH If unsuccessful: on the panel 2000VU - open the tape reproducer /PRAM C/B 2RX. After 10 seconds, close the C/B.

Subtask 24-00-00-810-088-A

F. Electrical Power
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
24	GPU cannot be connected to the aircraft	GAPCU	If at least one power source (IDG 1 or IDG 2, APU GEN or batteries) is connected to the electrical network of the aircraft: - On the ELEC control panel 35VU: . Push and release the EXT PWR pushbutton switch. If no power source is connected to the electrical network of the aircraft: - On the ELEC control panel 35VU: . Push the BAT 1 and BAT 2 pushbutton switches (the OFF legend goes off).

Subtask 24-00-00-810-078-A ** ON A/C NOT FOR ALL

G. Fire Protection
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
26	SMOKE LAV + CRG DET FAULT	SDCU	On the panel 49VU: - open the C/B 11WQ On the panel 122VU: - open the C/B 12WQ After 10 seconds, close the two C/B's.
26	ENG1(2) LOOP k FAULT	ENGINE FDU	On the panel 49VU: - For ENG1 FDU, open the C/B 7WD1. - For ENG2 FDU, open the C/B 8WD2. On the panel 121VU: - For ENG1 FDU, open the C/B 8WD1. - For ENG2 FDU, open the C/B 7WD2. - After 5 seconds, close the C/Bs.
26	APU FIRE LOOP k FAULT	APU FDU	On the panel 121VU: - Open the C/Bs 2WG and 1WG. - After 5 seconds, close the C/Bs.

Subtask 24-00-00-810-079-A

H. Flight Controls
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
27	F/CTL ELAC 1(2) FAULT F/CTL ALTN LAW FAULT	ELAC	Reset the defective ELAC: - Make sure that the hydraulic systems are depressurized before the reset. - Set the ELAC pushbutton switch to OFF, then to ON.
27	ELAC or SEC malfunction	ELAC or SEC	Reset the defective ELAC: - Make sure that the hydraulic systems are depressurized before the reset. Open, then close the C/B of the defective ELAC or SEC. For the ELAC 1(2): - On the panel 49VU, C/B 15CE1. - On the panel 121VU, C/B 15CE2. For the SEC 1(2)(3): - On the panel 49VU, C/B 21CE1. - On the panel 121VU, C/B 21CE2 or 21CE3.
27	E/W FCDC1(2) FAULT	FCDC	On the panel 49VU: - For FCDC1, open the C/B 20CE1. - For FCDC2, open the C/B 20CE2. - After 5 seconds, close the C/Bs.

Subtask 24-00-00-810-089-A ** ON A/C NOT FOR ALL

I. Fuel
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
28	Loss of fuel quantity indication or, Simultaneous triggering of FUEL L XFR VALVE CLOSED and FUEL R XFR VALVE CLOSED, although FUEL SD indicates no anomaly.	FQIC	On the overhead circuit breaker panel 49VU: - Open the C/B 1QT. On the rear circuit breaker panel 121VU: - Open the C/Bs 2QT and 8QT. After 5 seconds, close the three C/B's.

Subtask 24-00-00-810-089-B ** ON A/C NOT FOR ALL

I. Fuel
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
28	Loss of fuel quantity indication	FQIC	On the overhead circuit-breaker-panel 49VU: - Open the circuit-breaker 1QT. On the rear circuit-breaker-panel 121VU: - Open the circuit breakers 2QT and 8QT. After five seconds, close the three circuit breakers.

Subtask 24-00-00-810-080-A

J. Ice and Rain Protection
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
30	ANTI ICE L(R)/WINSHIELD (WINDOW)	WHC	Open then close the C/B of the defective WHC. For the WHC1: - on the panel 122VU, C/B 5DG1. For the WHC2: - on the panel 122VU, C/B 5DG2.

Subtask 24-00-00-810-081-A

K. Indicating/Recording Systems
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
31	FWS FWC 1(2) FAULT	FWC	Open then close the C/B of the defective FWC For the FWC1: - on the panel 49VU, C/B 3WW For the FWC2: - on the panel 121VU, C/B 2WW. Wait 50 seconds after you close the C/Bs.
31	EIS DMC 1(2)(3) FAULT	DMC	Open then close the circuit breaker of the defective DMC For the DMC1: - on the overhead C/B panel 49VU, the circuit breaker 10WT1. For the DMC2: - on the rear C/B panel 121VU, the circuit breaker 10WT2. For the DMC3: - on the rear C/B panel 121VU, the circuit breaker 10WT3.
31	CAPT PFD DU malfunction	CAPT PFD DU	On the CAPT lightning/loud speaker control-panel 301VU, turn the PFD potentiometer from the BRT position to the OFF position. - Wait for more than five seconds. On the CAPT lightning/loud speaker control-panel 301VU, turn the PFD potentiometer from the OFF position to the BRT position.
31	CAPT ND DU malfunction	CAPT ND DU	On the CAPT lightning/loud speaker control-panel 301VU, turn the ND potentiometer from the BRT position to the OFF position. - Wait for more than five seconds. On the CAPT lightning/loud speaker control-panel 301VU, turn the ND potentiometer from the OFF position to the BRT position.
31	F/O PFD DU malfunction	F/O PFD DU	On the F/O lightning/loud speaker control-panel 500VU, turn the PFD potentiometer from the BRT position to the OFF position. - Wait for more than five seconds. On the F/O lightning/loud speaker control-panel 500VU, turn the PFD potentiometer from the OFF position to the BRT position.
31	F/O ND DU malfunction	F/O ND DU	On the F/O lightning/loud speaker control-panel 500VU, turn the ND potentiometer from the BRT position to the OFF position. - Wait for more than five seconds. On the F/O lightning/loud speaker control-panel 500VU, turn the ND potentiometer from the OFF position to the BRT position.
31	EWD malfunction	EWD	On the ECAM control panel turn the UPPER DISPLAY potentiometer from the BRT + position to the OFF position. - Wait for more than five seconds. On the ECAM control panel turn the UPPER DISPLAY potentiometer from the OFF position to the BRT + position.
31	SD malfunction	SD	On the ECAM control panel turn the LOWER DISPLAY potentiometer from the BRT position to the OFF position. - Wait for more than five seconds. On the ECAM control panel turn the LOWER DISPLAY potentiometer from the OFF position to the BRT position.

Subtask 24-00-00-810-082-A

L. Landing Gear
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
32	Braking malfunction	BSCU	On the panel 121VU: - open the C/Bs 1GG, 2GG, 3GG and 4GG - after 5 seconds, close the CB's
32	L/G LGCIU 1(2) FAULT	LGCIU 1(2)	For the LGCIU 1: - on the panel 121VU, open the C/B 52GA then on 49VU, C/B 1GA. After 15 seconds, close the C/B 1GA and C/B 52GA For the LGCIU 2: - on the panel 121VU, open the C/B 2GA. After 15 seconds, close the C/B 2GA

Subtask 24-00-00-810-083-A ** ON A/C NOT FOR ALL

M. Navigation
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
34	NAV MMR 1(2) FAULT	MMR1(2)	For the MMR 1: - On the panel 49VU, open the C/B 42RT1. - After 5 seconds, close the C/B. For the MMR 2: - On the panel 121VU, open the C/B 42RT2. - After 5 seconds, close the C/B.
34	NAV TCAS FAULT	TCAS	On the panel 121VU: - Open the C/B 4SG. - After 5 seconds, close the C/B.
34	NAV GPWS FAULT NAV GPWS TERR DET FAULT	GPWC	On the panel 121VU: - Open the C/B 3WZ. - After 5 seconds, close the C/B.
34	NAV GPS 1(2) FAULT	GPSSU	On the panel 121VU: - For GPSSU1, open the C/B 2SN1. - For GPSSU2, open the C/B 2SN2. - After 5 seconds, close the C/Bs.
34	NAV RA 1(2) FAULT	XCVR-RA	On the panel 121VU: - For XCVR-RA 1, open the C/B 1SA1. - For XCVR-RA 2, open the C/B 1SA2. - After 5 seconds, close the C/Bs.

Subtask 24-00-00-810-083-D ** ON A/C NOT FOR ALL

M. Navigation
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
34	NAV MMR 1(2) FAULT	MMR1(2)	For the MMR 1: - On the panel 49VU, open the C/B 42RT1. - After 5 seconds, close the C/B. For the MMR 2: - On the panel 121VU, open the C/B 42RT2. - After 5 seconds, close the C/B.
34	NAV TCAS FAULT	T/TISS	On the panel 121VU: - Open the C/B 2004SG. - After 10 seconds, close the C/B.
34	NAV GPWS FAULT NAV GPWS TERR DET FAULT	T/TISS	On the panel 121VU: - Open the C/B 2004SG. - After 10 seconds, close the C/B.
34	NAV ATC/XPDR FAULT	T/TISS	On the panel 121VU: - Open the C/B 2004SG. - After 10 seconds, close the C/B.
34	NAV GPS 1(2) FAULT	GPSSU	On the panel 121VU: - For GPSSU1, open the C/B 2SN1. - For GPSSU2, open the C/B 2SN2. - After 5 seconds, close the C/Bs.
34	NAV RA 1(2) FAULT	XCVR-RA	On the panel 121VU: - For XCVR-RA 1, open the C/B 1SA1. - For XCVR-RA 2, open the C/B 1SA2. - After 5 seconds, close the C/Bs.

Subtask 24-00-00-810-084-A ** ON A/C NOT FOR ALL

N. Water/Waste
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
38	Fault messages on the FAP in the cabin	Vacuum System Controller	On the panel 2001VU: - open the C/B 35MG - after 30 seconds, close the C/B.

Subtask 24-00-00-810-085-A

O. Information Systems
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
46	ATSU malfunction	ATSU	On the rear circuit breaker panel 121VU: - Open the C/Bs in this order: 3TX1 and 5TX1. - After 5 seconds, close the C/Bs in this order: 5TX1 and 3TX1.

Subtask 24-00-00-810-086-A

P. Engine
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
70	ENG 1(2) IGN A + B FAULT	FADEC and EIU	On the overhead circuit-breaker panel 49VU and rear circuit-breaker panel 121VU, open then close the circuit breakers of the defective FADEC. For engine 1: 2KS1 and 4KS1. For engine 2: 2KS2 and 4KS2.
70	ENG 1(2) FADEC A(B) FAULT	FADEC	On the overhead circuit-breaker panel 49VU and rear circuit-breaker panel 121VU, open then close the circuit breakers of the defective FADEC. For engine 1: 2KS1 and 4KS1. For engine 2: 2KS2 and 4KS2.

Subtask 24-00-00-810-090-A

Q. Engine Indicating
(1) Computer Reset Table

ATA	SYSTEM MALFUNCTION	COMPUTER	RESET PROCEDURE
77	Loss of the VIB N1 and VIB N2 indications on ENGINE SD page	EVMU	On rear circuit breaker panel 121VU: - Open the engine/ENG1 and 2/EVMU circuit breaker (1EV). - After five seconds, close the engine/ENG1 and 2/EVMU circuit breaker (1EV).

[Rev.8 from Aug 2018] 2026.04.04 04:26:08 UTC