757
MAINTENANCE MANUAL

BACKDRIVE CONTROL HANDLE  FWD 
RAT CHECKOUT MODULE C 
TACHOMETER 
ACCESS PANEL  GROUND MANUAL SWITCH 

FWDFAIRING PANEL
RAT TACHOMETER AND GROUND-MANUAL-SWITCH
D
Ram Air Turbine (RAT) System
Figure 501 (Sheet 2)

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 29-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 015-009
 (6)  
Remove the access panel for the ground manual switch from the fairing on the aft bulkhead of the right wheel well.

 D.  
Do the System Test for the Manual Deployment System of the Ram Air Turbine (RAT)

 S 865-145
 WARNING: MAKE SURE THAT THERE ARE NO PERSONS OR EQUIPMENT IN THE RAT
_______ AREA BEFORE RAT RETRACTION OR EXTENSION. FAST MOVEMENT OF THE RAT AND DOOR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 CAUTION: DO NOT HOLD THE SWITCH IN THE DEPLOY POSITION MORE THAN FIVE
_______ SECONDS. THE RAT ACTUATOR SOLENOID CAN BE DAMAGED IF IT IS ENERGIZED MORE THAN TEN SECONDS.
 (1)  
Push the RAT deployment switch on the engine-start/RAT-control panel to the DEPLOY position. Release the RAT deployment switch in less than five seconds.

 S 285-041

 (2)  
Make sure the RAT moves to the extended position in less than five seconds.

 NOTE: The time starts when the deployment switch is first
____ pressed and stops when the blade-lock plunger releases the turbine hub.
 S 825-051
 (3)  
Manually turn the turbine hub to align the index mark on the hub with the index mark on the strut.

 (4)  
Pressurize the right hydraulic system (AMM 29-11-00/201).

 S 865-137
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A

757 MAINTENANCE MANUAL
 S 825-117
 (5)  
Hold the ground manual switch in the up (stow) position until the RAT is fully retracted.

 S 865-138

 (6)
Remove hydraulic power if it is not necessary (AMM 29-11-00/201).

 E. Do the RAT Auto Deployment System Test
 S 865-062
 (1)  Open these circuit breakers on the P11 panel:
 (a)  
11D26, HYDRAULIC RAT AUTO CONT or HYDRAULIC RAT CONT

 (b)  
11D27, HYDRAULIC RAT AUTO PWR

 S 865-063
 (2)  
Do the system No. 1 air/ground relays flight mode simulation (AMM 32-09-02/201).

 S 865-064

 (3)  
Pressurize the auxiliary No. 2 pitot system to 0.50 | 0.02 in. Hg (105 knots) (AMM 34-11-00/201).

 NOTE: When the auxiliary No. 2 pitot system is pressurized, the
____ captain's static system and the auxiliary No. 2 static system must stay at ambient pressure.
 S 865-065
 (4)  Close these circuit breakers on the P11 panel:
　
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