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 F.  RVDT flap position transmitters (Ref 27-58-00) are installed in 7 places throughout the TE flap drive mechanisms. An RVDT transmitter is installed in each power package and in the outboard transmission of each flap. The flap actuator has an integral RVDT transmitter. Each RVDT transmitter is wired to all 3 flap control units, which process the position signal for use in flap control, position indication, and asymmetry and failure detection.
 2.  Flap Control Lever and RVDT Assembly (Fig. 2)
____________________________________
 A.  The flap control lever and the flap lever RVDT assembly are located on the right side of the control stand. The RVDT assembly houses three RVDT's which are driven by the same input shaft. The lever controls the position of the trailing edge flaps by pivoting the shaft of the RVDT assembly through a mechanical linkage. The RVDT's convert flap lever position to an electrical signal which is routed to the three flap control units.
 B.  The flap control lever travels through a 90° arc with detents at 0, 1, 5, 10, 20, 25, and 30 units. The lever has a spring-loaded telescoping handle which locks in each detent as the lever is moved. Gates at 1 and 20 units prevent movement of the control lever past those detents without stopping. The control lever must be lowered into the detent at 1 or 20 units and passed under the gate before the lever can be moved further. The gate at 1 unit allows a slight pause in flap actuation while a group of leading edge flaps extend or retract. The gate at 20 units signals the maximum flap position for safe takeoff.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE A  FLAP LIMIT 1 280K 5 260K
SEE B
10 240K 20 231K 25 205K 30 180K
P2-3 PILOTS' CENTER A INSTRUMENT PANEL 
UNITS CONTROL FLAP  1 UP FLAP 
5 
FLAP CONTROL LEVER HANDLE  10 
SEE  C  A  A  FLAP  25 20 
30 
A-A 
RVDT ASSEMBLY FLAP CONTROL LEVER 

B
C
Trailing Edge Flap System Component Location Figure 2 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
INBOARD FLAP TORQUE TUBE
NO-COAST DRAG BRAKE
BODY GEAR
WHEEL WELL
FORWARD
BULKHEAD

ANGLE GEARBOX (TYP)
FWD
A
747-400
MAINTENANCE MANUAL

SEE D
INBOARD FLAP OUTBOARD FLAP
OUTBOARD FLAP TORQUE TUBE
INBOARD FLAP
POWER PACKAGE

INPUT LEVER ASSEMBLY
SEE F
SEE E

OUTBOARD FLAP POWER PACKAGE
SEE G
TORQUE TUBES
D
Trailing Edge Flap System Component Location Figure 2 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INPUT LEVER
HOUSING
CENTER BULKHEAD
INBOARD FLAPS INPUT CRANK
INBOARD FLAPS TORQUE TUBE
FLAP ACTUATOR
CONTROL  OUTBOARD FLAPS 
INPUT  VALVE  INPUT CRANK 
CRANK  BYPASS VALVE 
ACTUATOR MOTOR 
VALVE PRIORITY  INPUT LEVER ASSEMBLY 
CARTRIDGE FLOW CONTROL  E 

CHECK
VALVE
FLAP
INPUT POWER
CRANK
FLAP UNIT
CONTROL
(GEARBOX) MODULE
FLAP POWER UNIT
(GEARBOX) HYDRAULIC MOTOR
TORQUE DRIVE ALTERNATETUBE LIMIT SWITCH PACK ALTERNATE
ALTERNATE  RVDT LIMIT
ELECTRIC MOTOR  TRANSMITTER SWITCH PACK(BELOW GEARBOX)
TORQUE INBOARD FLAP POWER PACKAGE DRIVE TUBE F
ALTERNATE RVDTELECTRIC TRANSMITTERMOTOR HYDRAULIC MOTOR
OUTBOARD FLAP POWER PACKAGE
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 4(39)