(b)  
11D27, HYDRAULIC RAT AUTO PWR or HYDRAULIC RAT AUTO

 S 495-170
 WARNING: INSTALL THE SAFETY SCREEN BEFORE THE RAT IS BACK-DRIVEN.
_______ THE FAST MOVEMENT OF THE RAT TURBINE BLADES CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (9) Do these steps to install the RAT safety screen (Fig. 502):
 ú  (a) If the lift fixture A71015-87 is used, secure the adapter to the safety screen support with a nut and washer.
 (b)  
Attach the safety screen support to the lifting fixture.

 (c)  
Put the safety screen on the support and tighten the strap around the safety screen.

 (d)  
Remove the bolts and move apart the forward and aft cages of the safety screen.

 (e)  
Remove the top bolt, spacer, and nut from the brace which is in the aft cage.

 (f)  
Loosen the knurled retainer nut on the adjustment screw on each side of the brace in the aft cage.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-21-00
 ALL  ú ú 09.1 Page 525 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 757 MAINTENANCE MANUAL
 (g)  Turn both adjustment screws to retract the pads on the end of the adjustment screws.
 NOTE:____ This will give clearance to install the aft cage on the RAT hydraulic pump.
 (h) (i) (j) (k)  Put the aft cage on the RAT hydraulic pump.Install the top bolt, spacer, and nut in the brace to attach the aft cage to the RAT.Turn both adjustment screws on the aft-cage brace until the adjustment-screw pads are tight against the RAT hydraulic pump.Tighten the knurled retainer nuts to lock the adjustment screws in position.

 CAUTION:_______ SET THE SAFETY SCREEN FORWARD CAGE TO THE CORRECT HEIGHT
 BEFORE YOU MOVE IT INTO POSITION.  IF THE CAGE TOUCHES THE
 TURBINE BLADES, IT CAN CAUSE DAMAGE TO THE BLADES OR THE
 GOVERNOR MECHANISM.

 (l)  
Raise the forward cage to the correct height with the lifting fixture.

 (m)  
Carefully move the forward cage into position around the RAT so that the cage does not hit the turbine blades.

 (n)  
Install the bolts to connect the forward and aft cages of the safety screen.

 (o)  
Loosen the strap and remove it from around the safety screen.

 (p)  
Lower the lifting fixture and move the fixture away from the safety screen.

 S 865-218
 (10) Pressurize the center hydraulic system (AMM 29-11-00/201).
 S 865-173
 CAUTION: QUICKLY RELEASE THE GROUND-CHECKOUT-MODULE LEVER IF THE
_______ TACHOMETER OVER-SPEED LIGHT COMES ON. IF THE SPEED OF THE RAT BECOMES TOO HIGH, DAMAGE TO EQUIPMENT CAN OCCUR.
 (11)
 Move the back-drive control handle on the RAT checkout module in the right wheel well to the back-drive position.

 S 865-174

 (12)
 Push and hold the lamp test switch on the RAT tachometer.

 S 215-175

 (13)
 Make sure the red and green lights on the RAT tachometer are both on.

 (14)
 Release the lamp test switch on the RAT tachometer.

 S 865-176
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