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MAINTENANCE MANUAL
E6
Transformer Rectifier APU SchematicFigure 3
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MAINTENANCE MANUAL
(c)
Thermal switches within the TRU protect the TRU during an overheat condition (Ref Fig. 3 for overheat thermal switches closing temperatures). An overheat thermal switch closure causes the APU start TRU overheat relay to energize. This relay de-energizes the APU start enable relay. The APU start enable relay energizes the APU crank contactor via the APU start relay. The APU starter motor will now receive power from the APU battery.
(d)
A latching circuit prevents the APU start TRU overheat relay from de-energizing while the APU is being started. This prevents the APU starter motor from cycling back to TRU power during a start sequence in which an overheat condition occurs.
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FAULT ISOLATION/MAINT MANUAL
TRANSFORMER-RECTIFIER
* SEE THE WDM EQUIPMENT LIST AIRPLANES WITH APU START TRU
Transformer-Rectifier - Component Index
Figure 101
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FAULT ISOLATION/MAINT MANUAL
PANEL P6
FLIGHT COMPARTMENT
T101 (E1-2) LEFT TRU, T102 (E1-1) RIGHT TRU, FWD DOOR, 119BL CENTER ACCESS MAIN EQUIPMENT
MAIN EQUIPMENT CENTER
APU START TRU, T189 SEE A
(REF) AFT CARGO DOOR, 822
AFT EQUIPMENT CENTER RACK, E6 FWD RECTIFIER UNIT, T189 APU START TRANSFORMER FWD A 1
1 AIRPLANES WITH APU START TRU
Transformer-Rectifier - Component Location
Figure 102
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TRANSFORMER - RECTIFIER UNITS - REMOVAL/INSTALLATION
____________________________________________________
1. General_______
A. The transformer-rectifier units (referred to as the TRU's) are located in the E1 equipment rack of the main equipment center. The left TRU, T101, is on shelf 1 and the right TRU, T102, is on shelf 2. The removal and installation procedures are the same for both TRU's.
TASK 24-32-01-024-015
2. Remove the TRU______________
A. References
(1)
AMM 20-10-01/401, E/E Rack Mounted Components
(2)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
B. Access
(1)
Location Zone
119/120 Main equipment center
(2)
Access Panels
119BL Main equipment center access
C. Prepare for Removal
S 864-001
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
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