Detailed Inspection of Rat Carbon Blades for Evidence of Plating Cracks

TASK 29-22-00-220-002-A
Detailed Inspection of Rat Carbon Blades for Evidence of Plating Cracks

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 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.

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

ZONE: 190
ZONE: 195
ZONE: 197
FIN: 2GE

1. Reason for the Job
Refer to the MPD TASK: 292000-09
DETAILED INSPECTION OF RAT CARBON BLADES FOR EVIDENCE OF PLATING CRACKS

NOTE: This Task is only applicable for Ram Air Turbines with the part number 762308 (with Blades made from composite material).

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	BRUSH - NON METALLIC
No specific	1	MAGNIFYING GLASS POWER 05X
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
98D29208246001	1	DEVICE-SAFETY,RAT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14FAB1)	Abrasive-- Scotch Brite Pads -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT
195	HYDRAULIC COMPT AND FAIRINGS
197	REAR FAIRING

D. 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 29-22-00-869-005-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 29-22-51-000-010-A	Removal of the Ram Air Turbine
TASK 29-22-51-400-010-A	Installation of the Ram Air Turbine
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure

3. Job Set-up
Subtask 29-22-00-941-088-A

A. Safety Precautions
(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 that the RAT is in operation.

Subtask 29-22-00-865-128-A

B. 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 ALL
49VU	HYD/HYD/PRESS/XMTR	1841GN	C11
** 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 29-22-00-865-129-A

C. 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

Subtask 29-22-00-860-127-A

D. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) Make sure that the 98D29208246001 DEVICE-SAFETY,RAT is removed from the RAT stowage compartment.
(4) Do the extension of the Ram Air Turbine on the ground (Ref. AMM TASK 29-22-00-869-005).

4. Procedure
Subtask 29-22-00-220-053-A

A. Detailed Inspection of the RAT Blades made from Composite Material
(1) Clean the RAT Blades:
(a) Clean the RAT-blades with water and the Non Aqueous Cleaner-General - - (Material No.08BAA9) . Use a BRUSH - NON METALLIC.
(b) Flush the RAT-blades with cold clean water.
(2) Examine the turbine blade for damage, scratches, scores and corrosion:
(a) Major damage (for example cracks, loose plating) is not permitted.
(b) Minor damage (for example nicks, scratches, scores) and corrosion is permitted:

If you cannot see copper or composite material with a MAGNIFYING GLASS POWER 05X.

(3) Shrinkage voids (crack-like indications) are permitted on the blend radius between the composite blade on each side and the titanium root fitting:

If you cannot see copper plating or composite substrate with a magnifying glass.

(4) A small ring of copper is permitted in an area approximately 0.13 mm (0.0051 in.) wide in the transition zone:

Where is the end of the plating around the 38.9 mm (1.5315 in.) diameter flange on the blade root fitting.

(5) The plating must be smooth, adherent and uniform in color.
(a) Definition of the plating damage type:

Crack: Plating separation, slit in the plating
Buckling/Blisters: Raised plating, plating separation from the material
Pits/Porosity: Small pores with a size less than 0.5 mm (0.0197 in.) that possibly have copper if examined with MAGNIFYING GLASS POWER 05X
Nodules: Plating beads with a diameter of less than 1.0 MM (0.0394 IN.). You can find this usually at the tip of the blade. These nodules must not have exposed copper.

Type of plating damage	Conditions	Disposition
Crack	Not permitted	Remove immediately
Buckling / Blisters	Not permitted	Remove immediately
Pits / Porosity (on the leading edge)	No pitting or porosity is permitted at the leading edge of a blade	Remove immediately
Pits / Porosity (on the faces)	Pitting or porosity is on the face of a blade	Conditional/scheduled removal (See NOTE)
Nodules	This a bi-product of the plating process	Satisfactory as it is, no repair necessary

NOTE: If the pits/porosity are found on the faces of a blade during a RAT/blade inspection, the RAT can stay on the A/C:

Until the next scheduled RAT ground test
Or after an in flight deployment, whichever comes first.

This means that the RAT can stay on the A/C for 18 month maximum after this inspection.

(6) It is permitted for the blade to have slight discoloration and superficial staining.
(7) Minor surface irregularities from substrate imperfections are permitted.
(8) You must remove corrosion stains with this procedure:
(a) Make the scotch brite pads Abrasive-- Scotch Brite Pads - (Material No.14FAB1) (grade 'very fine') moist with the Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .
(b) Rub the corrosion lightly with the scotch brite pads until the stains are removed.
(c) Flush the surface with clean cold water.
(9) If the damage is not in the limits replace the RAT (Ref. AMM TASK 29-22-51-000-010) and (Ref. AMM TASK 29-22-51-400-010).

5. Close-up
Subtask 29-22-00-860-128-A

A. Put the aircraft back to its initial configuration.
(1) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 29-22-00-865-130-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 29-22-00-942-071-A

C. Removal of the Ground Support Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the safety barriers.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 08:11:08 UTC