Operational Check of Ditching Configuration Control Circuit

TASK 21-26-00-710-004-A
Operational Check of Ditching Configuration Control Circuit

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 212600-04
OPERATIONAL CHECK OF DITCHING CONFIGURATION CONTROL CIRCUIT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-26-12-000-802-A	Removal of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
TASK 21-26-12-400-802-A	Installation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
TSM 21	(for corrective action)

3. Job Set-up
Subtask 21-26-00-040-084-A ** ON A/C NOT FOR ALL

A. Deactivation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
(1) Disconnect the electrical connector from the avionics-ventilation comfort duct-temperature-sensor (Ref. AMM TASK 21-26-12-000-802).

Subtask 21-26-00-865-053-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AE02
** ON A/C ALL
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AC04

Subtask 21-26-00-865-054-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 21-26-00-941-089-A

D. Safety Precautions
(1) Make sure that the air conditioning packs are off.
(2) Make sure that the engine 1 and 2 throttle control levers are at idle.

Subtask 21-26-00-861-053-A

E. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

NOTE: The energization of the aircraft electrical circuits starts a full test of the ventilation system. The test continues for 2 minutes approximately.

Subtask 21-26-00-860-058-C ** ON A/C NOT FOR ALL

F. Aircraft Maintenance Configuration
(1) On the VENTILATION section of panel 22VU:

Make sure that the BLOWER and EXTRACT pushbutton switches are in the AUTO configuration (the pusbutton switches are pushed and the FAULT and the OVRD legends are off).

(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel, push the PRESS pushbutton key.
(4) On the lower ECAM display unit:

The CAB PRESS page comes into view and shows the skin air-inlet (INLET) and the skin air-outlet (OUTLET) valves in the open position (if the outside air temperature is more than or equal to 12 DEG.C (53.6 DEG.F)).

NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

NOTE: If the avionics duct temperature is less than 40 DEG.C (104 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

Subtask 21-26-00-860-058-E ** ON A/C NOT FOR ALL

F. Aircraft Maintenance Configuration
(1) On the VENTILATION section of panel 22VU:

Make sure that the BLOWER and EXTRACT pushbutton switches are in the AUTO configuration (the pusbutton switches are pushed and the FAULT and the OVRD legends are off).

(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel, push the PRESS pushbutton switch.
(4) On the lower ECAM display unit:

The CAB PRESS page comes into view and shows the skin air-inlet and the skin air-outlet valves in the open position, if the outside air temperature is more than or equal to 12 DEG.C (53.6 DEG.F).

NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

NOTE: If the avionics duct temperature is less than 40 DEG.C (104 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

Subtask 21-26-00-010-050-A

G. Get Access
(1) Open access door 822 (Ref. AMM TASK 52-41-00-010-002).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 21-26-00-710-053-C

A. Operational Test of the Control Circuit of the Ditching Configuration

NOTE: You cannot do the operational test of the control circuit of the ditching configuration:

If the external air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.
If the avionics duct temperature is less than 40 DEG.C (104 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

ACTION	RESULT
1.On the CABIN PRESS section of panel 25VU: Push the DITCHING pushbutton switch.	On the DITCHING pushbutton switch: The ON legend comes on. On the PRESS page of the lower ECAM DU: The skin air-outlet valve closes. The skin-air inlet valve closes. NOTE: If the VENT AVNCS SYS FAULT ECAM warning comes into view on the upper ECAM DU, open and close circuit breaker 3HQ. If the warning goes out of view, no more procedure is necessary. If the warning stays in view, do the troubleshooting procedure TSM 21.
2.On the CABIN PRESS section of panel 25VU: Release the DITCHING pushbutton switch.	On the DITCHING pushbutton switch: The ON legend goes off. On the PRESS page of the lower ECAM DU: The skin air-outlet valve opens fully. The skin air-inlet valve opens fully.

ACTION

RESULT

1.On the CABIN PRESS section of panel 25VU:

Push the DITCHING pushbutton switch.

On the DITCHING pushbutton switch:

The ON legend comes on.
On the PRESS page of the lower ECAM DU:
The skin air-outlet valve closes.
The skin-air inlet valve closes.

NOTE: If the VENT AVNCS SYS FAULT ECAM warning comes into view on the upper ECAM DU, open and close circuit breaker 3HQ. If the warning goes out of view, no more procedure is necessary.
If the warning stays in view, do the troubleshooting procedure TSM 21.

2.On the CABIN PRESS section of panel 25VU:

Release the DITCHING pushbutton switch.

On the DITCHING pushbutton switch:

The ON legend goes off.
On the PRESS page of the lower ECAM DU:
The skin air-outlet valve opens fully.
The skin air-inlet valve opens fully.

5. Close-up
Subtask 21-26-00-410-050-A

A. Close Access
(1) Close access door 822 (Ref. AMM TASK 52-41-00-410-002).
(2) Remove the access platform(s).

Subtask 21-26-00-860-059-A

B. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 21-26-00-862-053-A

C. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 21-26-00-865-055-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 21-26-00-440-077-A ** ON A/C NOT FOR ALL

E. Reactivation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
(1) Connect the electrical connector to the avionics-ventilation comfort duct-temperature-sensor (Ref. AMM TASK 21-26-12-400-802).

[Rev.10 from 2021] 2026.04.02 06:11:01 UTC