(4)
Remove hydraulic power, if it is not necessary (AMM 29-11-00/201).

 (5)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 S 865-134
 S 865-135
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A

757 MAINTENANCE MANUAL
 TASK 29-21-00-735-144
 3.  System Test - Ram Air Turbine (RAT) Auto and Manual Deployment Systems______________________________________________________________________ (Fig. 501)
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power

 (2)  
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 (3)  
AMM 32-00-15/201, Main Gear Door Locks

 (4)  
AMM 32-09-02/201, Air/Ground Relays

 (5)  
AMM 34-11-00/201, Pitot-Static System

 B.  Access
 (1)  
Location Zone 144 Main Landing Gear Wheel Well 198 Wing to Body - Aft Lower Half (Right) 212 Control Cabin 730/740 Main Landing Gear and Doors

 (2)  
Access Panels
 198MR Ram Air Turbine

 C.  Prepare for the Test
 S 015-002
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT IF THE LOCKS ARE NOT INSTALLED CORRECTLY.
 (1)  
Open the landing gear doors and install the door locks (AMM 32-00-15/201).

 S 865-149

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (3)  
Remove the pressure from the right and center hydraulic system reservoirs (AMM 29-11-00/201).

 (4)
Push the STATUS switch on the EICAS display select panel.

 (5)  
Make sure the RAT message is not shown on EICAS.

 S 865-007
 S 215-008
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757 MAINTENANCE MANUAL
SEE A
SEE B RAT CHECKOUT MODULE
SEE CFAIRING PANEL
RAT TACHOMETER AND GROUND-DOOR
MANUAL-SWITCH  FWDACTUATION LINK SEE D
OUTBOARD WALL OF THE RAT COMPARTMENT AFT BULKHEAD OF THE
DEPLOYMENT ACTUATOR RIGHT MAIN WHEEL-WELL
A DIMENSION A
1 RAT-COMPARTMENT ACCESS-PANEL (198NZ)
SWIVEL VALVES
PIVOT BOLT (2 PLACES)
STRUT
DOOR COMPARTMENT RAT  PLUNGER BLADE LOCK 
TURBINE HUB 
FWD  INBD  B TURBINE BLADE  PUMP HYDRAULIC  1 THIS IS THE DIMENSION AT WHICH AND STRUT ARE NOT ALIGNED THE RAT RETRACTION WILL STOP IF THE INDEX MARKS ON THE HUB 

Ram Air Turbine (RAT) System
Figure 501 (Sheet 1)

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