Protection of the Ram Air Turbine (RAT) Blades (Aluminum Blades) from Corrosion

TASK 29-22-00-916-801-A
Protection of the Ram Air Turbine (RAT) Blades (Aluminum Blades) from Corrosion

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 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.

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

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 195

1. Reason for the Job

NOTE: This procedure gives the instruction to prevent corrosion of the RAT blades.

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)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.12ABD1)	Corrosion Preventive Compound-Water Displacing Ultra-thin Film -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195	HYDRAULIC COMPT AND FAIRINGS

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 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
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 29-22-00-860-144-A

A. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the SAFETY BARRIER(S) in position.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system:

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

(4) Depressurize the Blue hydraulic system and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(5) Depressurize the reservoir of the Blue hydraulic system.
(Ref. AMM TASK 29-14-00-614-001).

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

(6) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(7) Put the WARNING NOTICE(S) in position to tell persons not to operate the RAT:

On overhead panels 21VU and 40VU.

Subtask 29-22-00-865-153-A

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

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

4. Procedure
Subtask 29-22-00-916-050-A

A. Protection of the RAT Blades
(1) Clean the RAT blades with Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(2) Put the RAT blades in horizontal position and rub Corrosion Preventive Compound-Water Displacing Ultra-thin Film - (Material No.12ABD1) fully around the front and back surfaces of each blade.
(a) Be careful to apply Corrosion Preventive Compound-Water Displacing Ultra-thin Film - (Material No.12ABD1) only to the blade surfaces and do not let it flow into the turbine blade bearing.

NOTE: It is not possible to apply Corrosion Preventive Compound-Water Displacing Ultra-thin Film - (Material No.12ABD1) too frequently or too much with this procedure.

(3) After you apply the Corrosion Preventive Compound-Water Displacing Ultra-thin Film - (Material No.12ABD1) , make sure that the RAT blades have a tack-free moist surface.

5. Close-up
Subtask 29-22-00-865-154-A

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

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 29-22-00-860-145-A

B. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.

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

(2) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(3) Remove the SAFETY BARRIERS.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 00:25:55 UTC