Operational Test of the RAT Retraction Abort

TASK 29-22-00-710-802-A
Operational Test of the RAT Retraction Abort

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU DO WORK IN THE AREA ADJACENT TO THE EXTENDED RAT. IF THE BLUE HYDRAULIC SYSTEM IS PRESSURIZED, THE RAT BLADES CAN TURN. THIS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

CAUTION: BE CAREFUL WHEN YOU TOUCH OR MOVE THE RAM AIR TURBINE (RAT). THE RAT BLADES ARE MADE OF COMPOSITE MATERIAL AND CAN EASILY BECOME DAMAGED.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D29207550001	1	PROTECTION EQUIPMENT - RAT
98D29208581000	1	PROTECTION EQUIPMENT - RAT

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
197EB

C. Referenced Information

REFERENCE	DESIGNATION
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 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-22-00-820-005-A	Adjustment of the RAT Interlock Proximity Switch
TASK 29-22-00-869-005-A	Extension of the Ram Air Turbine (RAT) on the Ground
TASK 29-22-00-869-006-A	Retraction of the Ram Air Turbine (RAT) on the Ground

3. Job Set-up
Subtask 29-22-00-860-142-A

A. Aircraft Maintenance Configuration
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put the WARNING NOTICE(S) in position to tell persons to keep away from the range of movement of the RAT.
(3) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(4) Extend the Ram Air Turbine (RAT) (Ref. AMM TASK 29-22-00-869-001).
(5) Make sure that the 98D29208581000 PROTECTION EQUIPMENT - RAT or the 98D29207550001 PROTECTION EQUIPMENT - RAT is removed from the RAT.

Subtask 29-22-00-010-091-A

B. Get Access
(1) Open the access door 197EB.

Subtask 29-22-00-865-149-A

C. 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 29-22-00-865-151-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01

4. Procedure
Subtask 29-22-00-710-081-B

A. Test

ACTION	RESULT
1. On the RAT ground control-panel 3GE: Set the switch LAMP TEST to the test position and hold it there.	On the RAT ground control panel 3GE: The interlock warning lamp comes on. The actuator pressure lamp comes on. The RAT stowed lamp comes on.
Release the switch LAMP TEST.	All lamps go off on the panel 3GE.
2. Set the 28VDC switch to the ON position.
3. Manually set the blades of the RAT out of line with the leg assembly.
4. Pressurize the Blue Hydraulic System (Ref. AMM TASK 29-10-00-863-003).
5. On the RAT ground control-panel 3GE: Set the stow switch to the STOW position and hold it there.	On the RAT ground control-panel 3GE: The red actuator pressure light comes on. The RAT starts to retract but stops when it has travelled 8.5 deg. The interlock warning lamp comes on in amber. The red actuator pressure light goes off. NOTE: If there is a fault, the RAT may not stop when it has travelled 8.5 deg. If this happens, you must release the STOW switch before the RAT comes into contact with the aircraft. The RAT will then stop and go back to its fully extended position. If the RAT does not stop, retract it with the blades in line with the leg assembly. Do the adjustment of the interlock proximity switch (Ref. AMM TASK 29-22-00-820-005). If the fault continues, replace the RAT at the next opportunity.
6. On the RAT ground control-panel 3GE: Release the stow switch.	On the RAT ground control-panel 3GE: The stow switch moves to the center position.
Set the stow switch to the RESET position.	The interlock warning lamp goes off.
Release the stow switch.	The stow switch moves to the center position.
7. Manually set the blades of the RAT in line with the leg assembly.
8. On the RAT ground control-panel 3GE: Set the stow switch to the STOW position and hold it there.	The RAT retracts to its stowage position.
	On the RAT ground control-panel 3GE: The red actuator pressure light comes on. The green RAT stowed light comes on.
9. On the RAT ground control-panel 3GE: Release the stow switch.	On the RAT ground control-panel 3GE: The stow switch moves to the center position. The red actuator pressure light goes off after a short time.

5. Close-up
Subtask 29-22-00-410-083-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 197EB.

Subtask 29-22-00-865-152-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01

Subtask 29-22-00-860-143-A

C. Put the aircraft back to its initial configuration.
(1) Retract the RAT (Ref. AMM TASK 29-22-00-869-002).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Remove the WARNING NOTICE(S).
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:26:05 UTC