Fault of the Ram Air Turbine

TASK 29-22-00-810-801-A
Fault of the Ram Air Turbine

1. Possible Causes

EJECTION ACTUATOR [1GE]
P/BSW 2805GE
P/BSW-EMER ELEC PWR/MAN ON [24XE]
CHECK VALVE B [2050GM]
RAT stowed switch
RAT CTL PNL [3GE]
wiring
PRESSURE SWITCH
SDAC-1 [1WV1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-24-00-810-806-A	Result of the EMER GEN Test Incorrect (Failure of the Switching)
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-10-00-863-003	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-12-36-000-001	Removal of the Check Valve of the Blue Electric Pump
AMM 29-12-36-400-001	Installation of the Check Valve of the Blue Electric Pump
AMM 29-22-00-869-006	Retraction of the Ram Air Turbine (RAT) on the Ground
ASM 292201
AMM 29-22-12-000-003	Removal of the RAT Ground Control Unit
AMM 29-22-12-400-003	Installation of the RAT Ground Control Unit
AMM 29-22-53-000-010	Removal of the RAT Actuator
AMM 29-22-53-000-013	Removal of the Pressure Switch
AMM 29-22-53-000-014	Removal of the RAT Stowed Switch
AMM 29-22-53-400-010	Installation of the RAT Actuator
AMM 29-22-53-400-013	Installation of the Pressure Switch
AMM 29-22-53-400-014	Installation of the RAT Stowed Switch
ASM 315402
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC
AMM 31-60-00-860-001	EIS Start Procedure

3. Fault Confirmation
Subtask 29-22-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	HYD/RAT/CTL	2801GE	D14
** ON A/C NOT FOR ALL
49VU	HYD/RAT/CTL	2801GE	B13
** ON A/C ALL
106VU	CSM/G /EV/MAN/SPLY	6XE	B04
121VU	HYDRAULIC/RAT/SPLY/EXTN/SOL1	2803GE	P33

Subtask 29-22-00-860-053-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(3) Look for fault indications on the upper ECAM DU and examine the RAT.

NOTE: The message RAT OUT (RAT not extended) shows in GREEN on the Memo page only in flight, this causes the message HYD RAT FAULT on the upper ECAM DU on ground. The message RAT OUT changes color to AMBER on ground.

4. Fault Isolation
Subtask 29-22-00-810-050-B

A. If the upper ECAM DU shows the message HYD RAT FAULT and the RAT is extended:

Do a check for 28 VDC between the EJECTION ACTUATOR [1GE] connectors A/A and A/B, B/A and B/B ASM 292201.

NOTE: The solenoid valves are made unserviceable, if 28 VDC is supplied for more than 2 minutes.

WARNING: MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR BEFORE YOU EXTEND/RETRACT THE RAT.

(1) If there is no 28 VDC:

Retract the RAT AMM 29-22-00-869-006 and extend it again with the EMER ELEC POWER/MAN ON/AUTO P/BSW (24XE) on panel 21VU.
Retract the RAT AMM 29-22-00-869-006 and extend it again with the RAT MAN ON P/BSW (2805GE) on panel 40VU.

(a) If the operation of the RAT is satisfactory, no further actions are necessary.

NOTE: The uncommanded extension was due to a mechanical fault of the ejection jack or a spurious supply to one of the two deploy solenoids.

(2) If there is 28 VDC at one or both solenoids:
(a) Do a check for 28 VDC between:

The P/BSW 2805GE pin 4 and ground
The P/BSW-EMER ELEC PWR/MAN ON [24XE] pin 7 and ground ASM 292201.

(b) If there is 28 VDC:

Replace the related P/BSW.

The P/BSW 2805GE pin 4 and the EJECTION ACTUATOR [1GE] connector B/B
The P/BSW-EMER ELEC PWR/MAN ON [24XE] pin 7 and the EJECTION ACTUATOR [1GE] connector A/B ASM 292201.

(3) If the fault continues:

Do the trouble shooting procedure of the automatic deployment logic (Ref. TSM TASK 24-24-00-810-806).

(4) If the fault continues:
(a) Replace the EJECTION ACTUATOR [1GE] AMM 29-22-53-000-010 and AMM 29-22-53-400-010.
(b) If the fault continues:

Replace the CHECK VALVE B [2050GM] AMM 29-12-36-000-001 and AMM 29-12-36-400-001.

Subtask 29-22-00-810-051-B

B. If the upper ECAM DU shows the message HYD RAT FAULT and the RAT is not extended:

Do a check of the RAT triangle indication shown on the lower ECAM DU.

(1) If the RAT triangle is shown in green:

Disconnect the electrical connector (1GE-C) from the EJECTION ACTUATOR [1GE] .
Electrically connect the pins B and C of the connector (1GE-C) ASM 292201.

(a) If the fault does not continue:

Replace the RAT stowed switch AMM 29-22-53-000-014 and AMM 29-22-53-400-014.

(b) If the fault continues:

Replace the RAT CTL PNL [3GE] AMM 29-22-12-000-003 and AMM 29-22-12-400-003.

Do a check of the wiring for a GND connection between the EJECTION ACTUATOR [1GE] connector C/B and the SDAC connector AA/03D ASM 292201 and ASM 315402.

(2) If the RAT triangle is shown in white:

Pressurize the Blue Hydraulic system with the Blue Electric pump AMM 29-10-00-863-003 and look on the lower ECAM DU.

(a) If the RAT triangle is shown in amber:
1 Disconnect the electrical connector (1GE-D) from the EJECTION ACTUATOR [1GE] .
2 Do a check for 28 VDC at the electrical connector (1GE-D) between connector D/A and connector D/C ASM 292201.
3 If there is no 28 VDC:

Disconnect the electrical connector (1GE-E) from the EJECTION ACTUATOR [1GE] .

a If the fault does not continue:

Replace the PRESSURE SWITCH AMM 29-22-53-000-013 and AMM 29-22-53-400-013.

b If the fault does continue:

Replace the EJECTION ACTUATOR [1GE] AMM 29-22-53-000-010 and AMM 29-22-53-400-010.

c If the fault continues:

Do a check of the wiring for a GND connection between the EJECTION ACTUATOR [1GE] connector E/C and the SDAC connector AA/04G ASM 292201 and ASM 315402.

4 If there is 28 VDC:
a Disconnect the electrical connector (3GE-A) from the RAT CTL PNL [3GE] .
b Do again a check for 28 VDC at the electrical connector (1GE-D) between connector D/A and connector D/C ASM 292201.
c If there is no 28 VDC:

Replace the RAT CTL PNL [3GE] AMM 29-22-12-000-003 and AMM 29-22-12-400-003.

d If there is 28 VDC:

Do a check and repair the wiring between the EJECTION ACTUATOR [1GE] connector D/A and the RAT CTL PNL [3GE] connector A/G ASM 292201.

(3) If the RAT triangle is shown in amber:
(a) Do a test of the lights of the RAT CTL PNL [3GE] with the TEST switch to make sure that the lights are serviceable.
(b) Examine the red pressure light on the RAT CTL PNL [3GE] .
(c) If the red pressure light is ON:
1 Disconnect the electrical connector (1GE-E) from the EJECTION ACTUATOR [1GE] .
2 If the fault does not continue:
a Replace the Pressure Switch AMM 29-22-53-000-013 and AMM 29-22-53-400-013.
b Connect the electrical connector (1GE-E) to the EJECTION ACTUATOR [1GE] .
3 If the fault continues:
a Do a check of the wiring between the electrical connector (1GE-E) and the RAT CTL PNL [3GE] ASM 292201.
b Do a check of the wiring between the electrical connector (1GE-E) and the SDAC-1 [1WV1] ASM 315402 and ASM 292201.
c Repair the wiring , as necessary.
d If disconnected, connect the electrical connector (1GE-E) to the EJECTION ACTUATOR [1GE] .
4 If the fault continues:
a Replace the RAT CTL PNL [3GE] .
5 If the fault continues:
a Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
(d) If the red pressure light is OFF:
1 Do a check for 28 VDC between the RAT CTL PNL [3GE] connector A/L and A/J.
2 If there are 28 VDC:
a Do a check of the wiring between the electrical connector (1GE-E) and the SDAC-1 [1WV1] ASM 292201 and ASM 315402.
b If the fault continues:

Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.

3 If there are no 28 VDC:
a Replace the RAT CTL PNL [3GE] AMM 29-22-12-000-003 and AMM 29-22-12-400-003.

Subtask 29-22-00-860-054-A

C. Do the test as given in Para. 3. B. to make sure that operation is correct (no message shown).

5. Close-up
Subtask 29-22-00-860-050-A

A. De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:29:28 UTC