757 MAINTENANCE MANUAL
RAM AIR TURBINE (RAT) SYSTEM - ADJUSTMENT/TEST
______________________________________________
1. General_______
A. This procedure has three tasks. The first task is a system test of the ground deployment and retraction system for the ram air turbine (RAT). The second task is a system test of the auto and manual deployment systems for the ram air turbine (RAT). The third task is a system test of the hydraulic pump and drive system for the ram air turbine (RAT).
TASK 29-21-00-735-143
2. System Test - Ram Air Turbine (RAT) Ground Deployment and Retraction System___________________________________________________________________________ (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
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 015-122
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).
(2)
Supply electrical power (AMM 24-22-00/201).
S 865-154
(3)
Remove the pressure from the right and center hydraulic system reservoirs (AMM 29-11-00/201).
S 865-123
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29-21-00
ALL ú ú 01 Page 501 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 865-128
(4)
Push the STATUS switch on the EICAS display select panel.
S 215-129
(5)
Make sure the RAT message is not shown on EICAS.
S 015-130
(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 Ground Deployment and Retraction System of the Ram Air Turbine (RAT)
S 865-010
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE RAT AND
_______ THE RAT COMPARTMENT DOOR. FAST MOVEMENT OF THE RAT AND THE DOOR CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Hold the ground manual switch in the down (deploy) position to extend the RAT .
S 285-011
(2)
Make sure the RAT moves to the extended position in 10 +/- 5 seconds.
S 215-012
(3)
Make sure the RAT UNLOCKED light on the engine start/RAT control panel is on.
S 215-013
(4)
Make sure the RAT UNLOCKED message is shown on EICAS.
S 215-014
(5)
Make sure the RAT message is shown on EICAS.
S 865-015
(6)
Make sure the RAT turbine hub can be manually turned.
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