29-21-00
 ALL  ú ú 01 Page 502 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 825-016
 (7)  Turn the hub until the index mark on the hub is 3 degrees away from the index mark on the strut.
 NOTE: In this position, the blade-lock plunger will not engage and
____ the blade index switch will not close. If the switch does not stop RAT retraction, the turbine blades will not hit structure.
 S 865-017
 (8)  
Pressurize the right hydraulic system (AMM 29-11-00/201).

 S 865-018

 (9)  
Hold the ground manual switch in the up (stow) position.

 S 225-019

 (10)
 Make sure the RAT starts retraction and then stops when dimension A shown in Fig. 501 is 6.20 | 0.25 inches.

 NOTE: Release the ground manual switch to the neutral position
____ if the RAT continues to retract when dimension A is less than
 5.95 inches. Do a check of dimension A immediately after the RAT stops. The RAT position can change if the pressure decreases in the actuator.
 S 865-020
 (11)
 Hold the ground manual switch in the down (deploy) position for approximately one second and then release the switch.

 S 285-021

 (12)
 Make sure the RAT starts to extend and then stops when the switch is released.

 S 865-022

 (13)
 Hold the ground manual switch in the down (deploy) position until the RAT is fully extended.

 S 865-023

 (14)
 Decrease the pressure in the right hydraulic system to zero (Ref 29-11-00).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-21-00
 ALL  ú ú 01 Page 503 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 825-024
 (15)
 Manually move the turbine hub to align the index mark on the hub with the index mark on the strut.

 S 865-025

 (16)
 Hold the ground manual switch in the up (stow) position.

 S 865-026

 (17)
 Slowly increase the right system pressure with the hydraulic service cart (AMM 29-11-00/201).

 S 285-027

 (18)
 Make sure the RAT actuator releases and the RAT starts to retract when the pressure in the right system is 400 to 600 psi.

 S 225-028

 (19)
 Release the ground manual switch and make sure the RAT retraction stops.

 S 865-029

 (20)
 Pressurize the right hydraulic system to 3000 psi
 (AMM 29-11-00/201).

 S 865-030

 (21)
 Hold the ground manual switch in the up (stow) position until the RAT is fully retracted.

 E.
Put the Airplane Back to Its Usual condition.

 S 415-131
 (1)  
Install the access panel for the ground manual switch in the fairing on the aft bulkhead of the right wheel well.

 S 415-132

 (2)  
Put the reservoir depressurization valves in the right and center systems back to the closed (non-vented) position (AMM/29-11-00/201).

 S 415-133
 WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Remove the door locks and close the landing gear doors
　
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