Installation of the RAT Stowed Switch

TASK 29-22-53-400-014-A
Installation of the RAT Stowed Switch

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.

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	OHMMETER MULTIRANGE
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.678 and 0.565 m.daN (60.00 and 50.00 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FCC2)	Mineral Oil base Grease-Anti-seize Lithium Thickened System
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147BB, 147CB, 195BB

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 29-10-00-863-003-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 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-22-00-710-007-A	Operational Test of the Manual Deployment and the Retraction of the Ram Air Turbine
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
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
RAT Stowed Switch

3. Job Set-up
Subtask 29-22-53-860-093-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) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the reservoir of the Blue hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the left main gear door is open (Ref. AMM TASK 32-12-00-010-001).
(5) Make sure that the access door 195BB is open.
(6) Make sure that the access panel 147BB is open.
(7) Make sure that the access panel 147CB is open.
(8) Make sure that the WARNING NOTICE(S) are 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.

(9) Make sure that the safety barriers are in position.
(10) Make sure that the RAT is extended (Ref. AMM TASK 29-22-00-869-005).
(11) Make sure that the protective cover of the RAT compartment is removed.

Subtask 29-22-53-865-089-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 29-22-53-420-067-A

A. Installation of the RAT Stowed Switch
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking cap from the port of the RAT actuator (8).
(4) Remove the protective cap from the electrical connector of the stowed switch (6).
(5) Make sure that all the electrical connections are clean and in the correct condition.
(6) Install and adjust the stowed switch (6) as given in the subsequent steps:
(a) Make sure that the RAT actuator (8) is fully extended.
(b) Prepare the component interface:
1 Apply Mineral Oil base Grease-Anti-seize Lithium Thickened System (Material No.03FCC2) on the threads of the stowed switch (6).
(c) Install the nut (9) and the washer (10) on the stowed switch (6).
(d) Install an OHMMETER MULTIRANGE between the pins B and C of the electrical connector of the stowed switch (6).
(e) Install the stowed switch (6) in the RAT actuator (8) until no continuity is shown on the ohmmeter.
(f) Tighten the stowed switch (6).
(g) Remove the ohmmeter, remove the protective cap from the electical connector (7) and connect the connector (7) to the stowed switch (6).
(h) Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
2801GE, 2803GE, 6XE.

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

(i) Retract the RAT (Ref. AMM TASK 29-22-00-869-006).
(j) Install the RAT safety device (Ref. AMM TASK 29-22-00-860-007).
(k) Remove the electrical connector (7) from the stowed switch (6) and install the ohmmeter between the pins B and C of the stowed switch (6).
(l) Turn the stowed switch (6) into the RAT actuator (8) until no continuity is shown on the ohmmeter.
(m) Turn the stowed switch (6) out of the RAT actuator (8) until continuity is shown on the ohmmeter. Turn the stowed switch (6) between 90 degrees and 180 degrees (maximum) more in the same direction, until the locking tooth of the stowed switch engages in the hole on the RAT actuator.
(n) Remove the ohmmeter and connect the connector (7) to the stowed switch (6).
(7) TORQUE the nut (9) of the stowed switch (6) to between 0.678 and 0.565 m.daN (60.00 and 50.00 lbf.in )

.
(8) Installation of the lockwire:

WARNING: USE 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.

(a) Safety the nut (9) with the nearest bolt of the RAT with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 29-22-53-865-090-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 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 29-22-53-860-094-A

C. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(4) Examine the connection of the stowed switch (6) and the RAT actuator (8) and make sure that there is no leak.
(5) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

Subtask 29-22-53-710-065-A

D. Test
(1) Remove the RAT safety device (Ref. AMM TASK 29-22-00-860-008).
(2) Do the operational test of the manual deployment and the retraction of the RAT (Ref. AMM TASK 29-22-00-710-007).
(3) Make sure that the RAT stowed light on the RAT ground control panel 3GE operates correctly during the test.

5. Close-up
Subtask 29-22-53-410-064-A

A. Close Access
(1) Put the protective cover (1) in the correct installation position over the deployment solenoids.
(a) Tighten the screws (2) in the quick release fasteners (3).
(b) Install the screw (5) in the protective cover (1).
(2) Install the access panels 147BB 147CB.
(3) Close the main gear door (Ref. AMM TASK 32-12-00-010-001).
(4) Close the access door 195BB.
(5) Remove the safety barriers.
(6) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 00:26:32 UTC