Detailed Inspection of RAT Assembly and Doors in Deployed Position and Lubrication of Doors Linkage Strut Joints and Bearings

TASK 29-22-51-200-003-A
Detailed Inspection of RAT Assembly and Doors in Deployed Position and Lubrication of Doors Linkage Strut Joints and Bearings

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: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

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

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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.

ZONE: 195
ZONE: 197
FIN: 2GE

1. Reason for the Job
Refer to the MPD TASK: 292251-02
DETAILED INSPECTION OF RAT ASSEMBLY AND DOORS IN DEPLOYED POSITION AND LUBRICATION OF DOORS LINKAGE STRUT JOINTS AND BEARINGS.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	BLOWING EQUIPMENT - DRY AIR
No specific	AR	SAFETY BARRIER(S)
No specific	1	VACUUM CLEANER
No specific	2	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03HBC1)	Synthetic Ester base Grease-General Purpose Metallic Thickened Low Temp. -
(Material No.03JCA9)	Silicone base Grease-Mechanisms and Seals - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195	HYDRAULIC COMPT AND FAIRINGS
197	REAR FAIRING
195BB, 197EB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
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 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-22-00-820-004-A	Adjustment of the RAT Doors
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
TASK 29-22-51-680-003-A	Draining of the Ram Air Turbine Oil Drain Tank
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Ram Air Turbine - Clearances

3. Job Set-up
Subtask 29-22-51-010-065-A

A. Get Access
(1) Open the left main door of the main gear (Ref. AMM TASK 32-12-00-010-001).
(2) Open the access door 197EB.
(3) Open the access door 195BB.

Subtask 29-22-51-860-111-A

B. 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 not to pressurize the Blue hydraulic system:

In the cockpit on the hydraulic section 40VU of the overhead panel,
On the ground service panel of the Blue hydraulic system.

(3) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(4) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).

4. Procedure
Subtask 29-22-51-210-076-C

A. Detailed Visual Inspection of the RAT and the Doors in the Deployed Position
(1) Make sure that the door links are correctly attached to the leg assembly and to the RAT doors.
(2) Use the VACUUM CLEANER to remove the contamination from the ball bearings (3) and (6) and the link parts (4) and (5).

NOTE: The BLOWING EQUIPMENT - DRY AIR can be used if the VACUUM CLEANER is not available.

(3) Examine the RAT door link assembly:

The door link rods
The door link fork ends
The door link eye ends.
For contamination, damage or are bent.

NOTE: The RAT door link assembly and both ends must be clean and straight. No bends are acceptable.

(4) Examine the RAT doors for cracks, corrosion and any other damage.
(5) Apply the Silicone base Grease-Mechanisms and Seals - - (Material No.03JCA9) or the Synthetic Ester base Grease-General Purpose Metallic Thickened Low Temp. - (Material No.03HBC1) to:

The ball bearings (3) and (6)
Contact area between the link parts (4) and (5).

(6) Make sure that the movable parts of the door struts links are fully greased.
(7) Retract and deploy the RAT three times (Ref. AMM TASK 29-22-00-869-005) and (Ref. AMM TASK 29-22-00-869-006).
(8) Make sure that the RAT and its related components are correctly attached.
(9) Make sure that all the lockwire and the cotter pins are in the correct condition.
(10) Examine the RAT and its related components for cracks, corrosion and any other damage.
(11) Turn the turbine blades manually and make sure that they turn freely.
(12) Make sure that the clearance "H" between the turbine blade tip and the outboard RAT door edge (not door seal) is between 36.0 mm (1.4173 in.) and 44.0 mm (1.7323 in.).
(13) Make sure that the clearance "G" between the turbine blade tip and the inboard RAT door edge (not door seal) is between 31.0 mm (1.2205 in.) and 37.0 mm (1.4567 in.).
(14) If the clearances "H" and "G" are not in the permitted limits, adjust the length of the RAT actuator (Ref. AMM TASK 29-22-00-820-004).

Subtask 29-22-51-280-051-B ** ON A/C NOT FOR ALL

B. Special Inspection of the RAT
(1) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(2) Make sure that the hydraulic connections of the RAT and its related components do not leak.
(3) Make sure that the filter indicator of the RAT has not popped out.
(4) Do the draining of the RAT oil drain tank (Ref. AMM TASK 29-22-51-680-003).
(5) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(6) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
(7) Make sure that the clearance "F" between the highest point of the RAT hub (1) and the forward outboard attachment bracket (2) of the RAT box is not less than 16 mm (0.6299 in.).

NOTE: If the clearance is less than 16 mm (0.6299 in.) adjust the length of the RAT actuator (Ref. AMM TASK 29-22-00-820-004).

Subtask 29-22-51-280-051-E ** ON A/C NOT FOR ALL

NOTE: If the clearance is less than 14 mm (0.5512 in.) adjust the length of the RAT actuator (Ref. AMM TASK 29-22-00-820-004).

5. Close-up
Subtask 29-22-51-860-112-A

A. Put the aircraft back to the serviceable condition.
(1) Remove the WARNING NOTICE(S).
(2) Remove the safety barriers.

Subtask 29-22-51-410-063-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 197EB
(3) Close the access door 195BB.
(4) Close the left main door of the main gear (Ref. AMM TASK 32-12-00-410-001).

[Rev.10 from 2021] 2026.04.01 00:26:22 UTC