Ram Air Turbine Safety Screen
Figure 502 (Sheet 1)
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A 757 MAINTENANCE MANUAL
(j) (k) 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 865-156
(10) Pressurize the center hydraulic system with a hydraulic service cart (AMM 29-11-00/201) capable of supplying 25 GPM at 3000 PSI.
UP
KNURLED RETAINER NUT
ADJUSTMENT SCREW (2 LOCATIONS)
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MAINTENANCE MANUAL
S 865-097
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 865-098
(12)
Push and hold the lamp test switch on the RAT tachometer.
S 215-099
(13)
Make sure the red and green lights on the RAT tachometer are both on.
S 865-100
(14)
Release the lamp test switch on the RAT tachometer.
S 215-101
(15)
When the turbine blade speed has become stable, make sure the green light on the RAT tachometer is on, and the red light is off.
S 815-147
(16)
If the RAT tachometer overspeed light comes on, quickly release the Ground-Checkout module handle and consult the fault isolation section, under the heading "RAT overspeed light on while performing RAT system test".
S 735-118
(17)
If the green light on the RAT tachometer does not operate, you can do these steps to do a check of the speed of the RAT turbine blades:
(a)
Release the control handle from the back-drive position.
(b)
Remove the power from the center hydraulic system (AMM 29-11-00/201).
(c)
Move the lifting fixture below the safety screen.
(d)
Lift the safety screen support with the lifting fixture until the support touches the screen.
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