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 B.  Components used by the stabilizer trim indicating system are the 3 stabilizer position transmitters, the 2 stabilizer trim position indicators, the 3 flap control units, and the EIU's and EICAS display. The system is powered by 28 volts ac from the 28 vac bus 1 and the 28 vac ground service bus. Power is also supplied through the flap control units for the stabilizer trim maintenance displays on EICAS.
Stabilizer Position Transmitter
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 A.  The stabilizer position transmitters are mounted on the stabilizer hinge bulkhead. An adjustable control rod attaches each transmitter module to the stabilizer center box rear spar. The left and right transmitters are adjusted to set the stabilizer trim indicators to 3 units when the stabilizer is in the neutral position.
 B.  Each stabilizer position transmitter module contains a synchro transmitter and an RVDT transmitter. The synchro transmitters in the left and right modules drive the left and right stabilizer trim indicators on the pilots' control stand. The synchro transmitter in the center module is not used. The RVDT transmitters in all the modules supply position information to the flap control units for flight control computations and for display on the EICAS flight controls maintenance page.
Stabilizer Trim Position Indicator
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 A.  The stabilizer trim position indicators are located on either side of the P8 pilots' control stand. The indicators give stabilizer position in units of trim, from 0 units (stabilizer at maximum AIRPLANE NOSE DOWN position) to 15 units (stabilizer at maximum AIRPLANE NOSE UP position), with 3 units being stabilizer neutral position. Each stabilizer position indicator contains a synchro receiver which positions the indicator strip.
 B.  A lighted bar next to the indicator strip specifies the stabilizer green
 band during takeoff.Flap Control Unit
_________________
 A.  The 3 flap control units process position sensing signals for all flaps and the stabilizer in addition to providing flap control and protection. The flap control units convert the signals from the stabilizer transmitter RVDT's to a serial digital format for transmission to the EIU's on an ARINC 429 bus. The left flap control unit is located on the E1-2 electronics shelf and the center and right flap control units are located on the E2-2 electronics shelf in the main electrical equipment center.
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A
747-400
MAINTENANCE MANUAL

STABILIZER TRIM POSITION INFORMATION ON AUXILIARY EICAS DISPLAY
APL NOSE DN
0 S
2
T 4
A B
6
T
8 R
10
I M
12
O APL
F
14
NOSE
15 UP
F
SEE A
STABILIZER TRIM POSITION INDICATOR
A
STABLIZER
SEE B
FWD
SHEAR DECK
STABILIZER POSITION
TRANSMITTER MODULES

Stabilizer Trim Position Indicating System Component Location
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 5. Operation (Figs. 2 and 3)
_________
 A. Functional Description
 (1)  
As the stabilizer is deflected from the neutral position, the attached control rod drives the transmitter crank which pivots the transmitter module shaft. The transmitter electrical output varies as the shaft pivots. The synchro output signal drives the synchro receiver in the stabilizer trim position indicator which displays units of stabilizer trim. The RVDT output signal passes to the flap control units which process the signal and route it to the EIU's for display on EICAS and to other user systems.

 B.
Control

 (1)  
Operation of the stabilizer trim indicating system is automatic. The stabilizer trim indicators give units of stabilizer trim continuously.

 (2)  
The flight controls maintenance page may be called up on the auxiliary EICAS display. This page displays the values of stabilizer angular displacement in degrees. The directional symbol points upward for leading edge up and downward for leading edge down. The relationship of the stabilizer displacement between the EICAS display and the stabilizer trim position indicator is in Fig. 2.
　
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