Ram Air Turbine does not retract

TASK 29-22-00-810-803-A
Ram Air Turbine does not retract

1. Possible Causes

RAT interlock proximity switch

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-22-00-820-005	Adjustment of the RAT Interlock Proximity Switch
AMM 29-22-00-869-006	Retraction of the Ram Air Turbine (RAT) on the Ground
AMM 29-22-51-000-011	Removal of the RAT Interlock Proximity Switch
AMM 29-22-51-400-011	Installation of the RAT Interlock Proximity Switch

3. Fault Confirmation
Subtask 29-22-00-865-054-A

A. 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 29-22-00-860-056-B

B. Aircraft Maintenance Configuration
(1) Open the access panel 197EB.
(2) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(3) On the RAT ground control-panel (3GE):

Set the 28VDC switch to the ON position.
Set the LAMP TEST switch to the test position and make sure that all lights come on.

(4) Retract the RAT AMM 29-22-00-869-006.
(5) During the retraction of the RAT:

Obey the interlock warning light in the RAT control panel (3GE).
Obey the operation of the RAT.

4. Fault Isolation
Subtask 29-22-00-810-053-B

A. If the RAT starts to retract but returns to its fully extended position and the interlock warning light on the RAT control panel (3GE) comes on:

Do the adjustment of the RAT interlock proximity switch AMM 29-22-00-820-005.

(1) If the fault continues:

Replace the RAT interlock proximity switch AMM 29-22-51-000-011 and AMM 29-22-51-400-011.

Subtask 29-22-00-860-057-B ** ON A/C NOT FOR ALL

B. Do the fault confirmation procedure as given in Para. 3. to make sure that the operation is correct.

5. Close-up
Subtask 29-22-00-860-058-B

A. Put the aircraft back to the serviceable condition.
(1) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
(2) Close the access panel 197EB.

[Rev.8 from Aug 2018] 2026.04.04 04:29:28 UTC