Adjustment of the RAT Doors

TASK 29-22-00-820-004-A
Adjustment of the RAT Doors

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.

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

REFERENCE	QTY	DESIGNATION
No specific	1	GAGE - DEPTH
No specific	AR	SAFETY BARRIER(S)
No specific	Torque wrench: range to between 5.29 and 4.74 m.daN (39.01 and 34.96 lbf.ft )
No specific	Torque wrench: range to between 8.81 and 8.14 m.daN (64.97 and 60.03 lbf.ft )
98D29208246001	1	DEVICE-SAFETY,RAT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB, 197EB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	COTTER PIN	AIPC 29-22-03-02-118
28	COTTER PIN	AIPC 29-22-03-02-118
1	COTTER PIN	AIPC 29-22-83-02-120
28	COTTER PIN	AIPC 29-22-83-02-120

E. Referenced Information

REFERENCE	DESIGNATION
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 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-22-00-860-007-A	Installation of the Safety Device of the Ram Air Turbine
TASK 29-22-00-860-008-A	Removal of the Safety Device of the Ram Air Turbine
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
RAT Doors - Adjustment
RAT Doors - Clearance Adjustment

3. Job Set-up
Subtask 29-22-00-941-084-A

A. As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 29-22-00-010-080-A

B. Remove the access panels 195BB and 197EB.

Subtask 29-22-00-860-103-A

C. Aircraft Maintenance Configuration
(1) Connect a ground hydraulic supply to the ground service panel of the Blue hydraulic system.
(2) Energize the aircraft electrical circuits

Subtask 29-22-00-865-107-A

D. 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
121VU	HYDRAULIC/RAT/SPLY/EXTN/SOL1	2803GE	P33

Subtask 29-22-00-869-089-A

E. Extend the RAT (Ref. AMM TASK 29-22-00-869-005).

4. Procedure
Subtask 29-22-00-860-104-A

A. Preparation for the Adjustment
(1) Remove and discard the cotter pin (1).
(2) Remove the nut (2), the washer (3), the bolt (7) and the washer (6).
(3) Remove the door operating link (9) of the outer (LH) door from the leg fork (5).
(4) Temporarily attach the (LH) door to the aircraft structure, to keep it away from the range of the travel of the RAT.
(5) Remove the bushes (4) and (8).
(6) Remove and discard the cotter pin (28).
(7) Remove the nut (27), the washer (26), the bolt (20) and the washer (21).
(8) Remove the door operating link (24) of the inner (RH) door from the leg fork (23).
(9) Temporarily attach the (RH) door to the aircraft structure, to keep it away from the range of the travel of the RAT.
(10) Remove the bushes (22) and (25).
(11) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(12) Install the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-007).
(13) Make sure that the safety device does not lift the RAT above its retracted position. This will have an unwanted effect on the adjustment of the doors.

Subtask 29-22-00-820-065-A ** ON A/C NOT FOR ALL

B. Adjustment of the RAT Actuator
(1) Measure the clearance "A" between the highest point of the RAT hub and the forward outboard attachment bracket of the RAT box.

RAT Doors - Clearance Adjustment ** ON A/C NOT FOR ALL

(2) Make sure that the clearance is as specified:

clearance "A" must be not less than 16.0 mm (0.6299 in.).

(3) If the clearance is not correct, do the procedure that follows to adjust the length of the RAT actuator.
(a) Remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008).
(b) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(c) Remove the nut (15), the washer (14), the bolt (12) and the washer (13).
(d) Remove the RAT actuator (10) from the leg assembly (11).

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(e) Cut, remove and discard the lockwire from the locknut (16).
(f) Loosen the locknut (16) with a minimum of two turns.
(g) Remove the lock washer from the piston rod of the actuator.
(h) Turn the eye-end (17) to change the length of the actuator as necessary.
(i) Install the lock washer correctly in the slot of the piston rod.
(j) Tighten the locknut (16) temporarily, but do not safety it at this time.
(k) Put the eye-end (17) in position on the leg assembly (11).
(l) Install the bolt (12), the washers (13) and (14) and the nut (15). Tighten the nut (15) temporarily.
(m) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(n) Install the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-007).
(o) Measure the clearance "A" and make sure it is as given.
(p) If necessary you must do the adjustment procedure again.
(q) Remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008).
(r) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(s) TORQUE the lock nut (16) to between 8.81 and 8.14 m.daN (64.97 and 60.03 lbf.ft )

.
(t) Safety the lock nut (16) with the lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(u) TORQUE the nut (15) to between 5.29 and 4.74 m.daN (39.01 and 34.96 lbf.ft )

NOTE: Because of the design, there is a clearance of 0.8 mm (0.0315 in.) between the washers (13), (14) and the leg assembly (11).

Subtask 29-22-00-820-065-B ** ON A/C NOT FOR ALL

B. Adjustment of the RAT Actuator
(1) Measure the clearance "A" between the highest point of the RAT hub and the forward outboard attachment bracket of the RAT box.

RAT Doors - Clearance Adjustment ** ON A/C NOT FOR ALL

(2) Make sure that the clearance is as specified:

clearance "A" must be not less than 14.0 mm (0.5512 in.).

(3) If the clearance is not correct, do the subsequent procedure to adjust the length of the RAT actuator.
(a) Remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008).
(b) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(c) Remove the nut (15), the washer (14), the bolt (12) and the washer (13).
(d) Remove the RAT actuator (10) from the leg assembly (11).

.
(t) Safety the lock nut (16) with the lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(u) TORQUE the nut (15) to between 5.29 and 4.74 m.daN (39.01 and 34.96 lbf.ft )

NOTE: Because of the design, there is a clearance of 0.8 mm (0.0315 in.) between the washers (13), (14) and the leg assembly (11).

Subtask 29-22-00-820-066-A

C. Adjustment of the RAT Doors
(1) If the adjustment procedure for the RAT actuator was not necessary, remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008).
(2) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(3) Put the outer door-operating link (9) into the fork (5).
(4) Install the bushes (4) and (8) in the fork (5).
(5) Install the bolt (7), the washers (6) and (3) and the nut (2).
(6) Safety the nut (2) with a new AIPC 29-22-03-02-118 COTTER PIN (1) or AIPC 29-22-83-02-120 COTTER PIN (1).

(7) Cut, remove and discard the lockwire from the locknuts (30) and (32).

NOTE: The upper locknut (30) has a left-hand thread.

(8) Turn the turbine blades of the RAT until one blade aligns with the edge of the outer (LH) door.
(9) Turn the barrel (31) of the door operating link (LH) to adjust the clearance "B" between the tip of the blade and the RAT door edge (not the door seal) as necessary:

The clearance "B" must be within 36.0 mm (1.4173 in.) and 44.0 mm (1.7323 in.).

NOTE: The barrel of the operating link has two parts which are joined with a swivel link. Thus, if you turn one part of the barrel, only the eye-end related to that part is adjusted.

(10) Temporarily tighten the locknuts (30) and (32).
(11) Adjust the blades of the RAT until they align with the index marks of the leg assembly.

NOTE: If the blades do not align, the index mechanism will prevent the retraction of the RAT.

(12) Retract the RAT slowly (Ref. AMM TASK 29-22-00-869-006).
(13) Install the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT to prevent an accidental extension of the RAT (Ref. AMM TASK 29-22-00-860-007).
(14) With a GAGE - DEPTH measure the mismatch tolerance of the RAT door.

RAT Doors - Clearance Adjustment

(15) Measure the mismatch of the RAT door at:

The measuring point R which must be between 0.00 mm (0.0000 in.) and 1.50 mm (0.0591 in.)
The measuring point T which must be between 0.00 mm (0.0000 in.) and 1.00 mm (0.0394 in.)
The measuring point K which must be between 0.20 mm (0.0079 in.) and 1.30 mm (0.0512 in.)
The measuring point M which must be between 0.20 mm (0.0079 in.) and 0.80 mm (0.0315 in.).

(16) If one of the above measuring points is not correct:

Loosen one of the two locknuts (30) and (32) (the locknut (30) has a left-hand thread)
Turn the barrel of the door-operating link to adjust the length of the link to set the gap as necessary
Temporarily tighten the locknuts (30) and (32).

NOTE: If there is not enough adjustment available (the eye-end goes out of "safety"), then loosen the other locknut and adjust that end of the door operating link. Tighten the locknut when the adjustment is satisfactory.

(17) Remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008)
(18) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(19) Install the bush (22) in the fork (23).
(20) Put the inner door-operating link (24) into the fork (23) and install the bush (25).
(21) Install the bolt (20) and the washers (21) and (26) and the nut (27).
(22) Safety the nut (27) with a new AIPC 29-22-03-02-118 COTTER PIN (28) or AIPC 29-22-83-02-120 COTTER PIN (28).

(23) Cut, remove and discard the lockwire from the locknuts (33) and (35).

NOTE: The upper locknut (35) has a left hand thread.

(24) Turn the turbine blades of the RAT until one blade aligns with the edge of the inner (RH) door.
(25) Turn the barrel (34) of the door-operating link (RH) to adjust the clearance "C" between the tip of the blade and the RAT door edge (not the door seal) as necessary:

The clearance "C" must be between 31.0 mm (1.2205 in.) and 37.0 mm (1.4567 in.).

NOTE: The barrel of the operating link has two parts which are joined with a swivel link. Thus, if you turn one part of the barrel, only the eye-end related to that part is adjusted.

(26) Temporarily tighten the locknuts (33) and (35).
(27) Adjust the blades of the RAT until they align with the index marks on the leg assembly.

NOTE: If the blades do not align, the index mechanism will prevent the retraction of the RAT.

(28) Retract the RAT slowly (Ref. AMM TASK 29-22-00-869-006).
(29) Make sure that there is a clearance between the RAT, the link and the door during retraction.
(30) Install the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT to prevent an accidental extension of the RAT (Ref. AMM TASK 29-22-00-860-007).
(31) Loosen one of the two locknuts (33) and (35) and turn the barrel of the door-operation link to adjust the inner (RH) door.

NOTE: The inner door is adjusted correctly when it is flush with the outer door and :

The clearance V between both doors is between 2.0 mm (0.0787 in.) and 5.0 mm (0.1969 in.) along the longitudinal joint and
The clearances R, S, T, U, K, L, M, N, are between 2.0 mm (0.0787 in.) and 3.0 mm (0.1181 in.).

(32) Extend and retract the RAT to make sure that the RAT door seals are in their correct position (Ref. AMM TASK 29-22-00-869-005) and (Ref. AMM TASK 29-22-00-869-006).
(33) The mismatch tolerance O, P, Q, along the longitudinal joint must be between 0.0 mm (0.0000 in.) and 1.50 mm (0.0591 in.).
(34) Temporarily tighten the locknuts (33) and (35).

(35) Remove the 98D29208246000 SAFETY DEVICE-RAT or the 98D29208246001 DEVICE-SAFETY,RAT (Ref. AMM TASK 29-22-00-860-008).
(36) Extend the RAT (Ref. AMM TASK 29-22-00-869-005).
(37) Make sure that the two door-operating links are in a safe condition.
(38) Make sure that you cannot put a wire 1.2 mm (0.0472 in.) thick through the check holes of the links.
(39) Tighten the locknuts (30), (32), (33) and (35).
(40) Safety the locknuts with the lockwire, 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 29-22-00-710-065-A

D. Do this Test
(1) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(2) Make sure that the RAT, the links and the doors operate correctly when the RAT retracts.

5. Close-up
Subtask 29-22-00-860-105-A

A. Put the aircraft back to its initial configuration.
(1) Depressurize the Blue hydraulic system
(Ref. AMM TASK 29-10-00-864-003).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 29-22-00-410-075-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panels 195BB 197EB.
(3) Remove the safety barriers.

[Rev.10 from 2021] 2026.04.01 08:12:01 UTC