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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
FWD
DOOR TORQUE TUBE
SEE A
DOOR 1
DOOR TORQUE TUBE
SEEB
DOOR 5
Main Entry Door Torque Tube Figure 2 (Sheet 1)
C71999
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
HINGE FAIRING
UPPER HINGE HOUSING
ELBOW PIN
UPPER HINGE ARM CONTROL ROD
UPPER SHAFT
CRANK
BEARING ASSEMBLY
CENTER SHAFT COUPLING
LOWER SHAFT
LOWER HINGE ARM
ELBOW PIN
LOWER HINGE HOUSING
FWD GUIDE ARM
GUIDE ARM FITTING
DOOR 1
A
Main Entry Door Torque Tube Figure 2 (Sheet 2)
C72002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
UPPER HINGE HOUSING
BEARING
UPPER HINGE ARM GUIDE ARM
GUIDE ARM
FITTING
UPPER SHAFT
BEARING ASSEMBLY
UPPER AND LOWER COUPLING CONTROL ROD
CRANK LOWER SHAFT
BEARING
LOWER HINGE
HOUSING
LOWER HINGE ARM DOOR 5
B
Main Entry Door Torque tube Figure 2 (Sheet 3)
C72007
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
5. Body Torque Tube (Fig. 3)
________________
A. On No. 1 entry door, the body torque tube controls the upper and lower hinge arms (detail A). The torque tube consists of the upper link, telescopic sleeve, rotary snubber, hold-open collar, and bellcrank link. The upper link, which connects to upper hinge arm, extends through upper bearing plates and is splined to receive a telescopic sleeve. The telescopic sleeve is splined and clamped to a rotary snubber. The rotary snubber, which retards rapid motion of the door. The lower shaft extends through a compression spring, hold-open collar, and anchor plate assembly which lock the door in the open position. A release handle is provided on the anchor plate to disengage the hold-open device. The lower end of the shaft is splined and clamped to a bellcrank link which extends through lower bearing plates and guide plates, is bolted to lower hinge arm and pinned at the elbow of guide arm. The guide arm contains a roller pin which operates in the S-shaped tracks of guide plates to control rotation of the torque tube.
B. On No. 5 entry door, the body torque tube functions to control the upper and lower hinge arms (Detail B). The torque tube consists of the bellcrank link, upper sleeve, hold-open fitting, release lever, rotary snubber, lower sleeve, and lower link. A bellcrank link, which connects to the upper hinge arm and guide arm, extends through the upper bearing plate and is splined to receive the upper sleeve. The upper sleeve, clamped to the bellcrank link, extends through the hold-open fitting and engages the sprocket shaft and rotary snubber. The lower sleeve is splined and clamped to the rotary snubber and lower link. The lower link extends through the lower bearing plate and connects to the lower hinge arm.
6. Door Lining and Insulation
__________________________
A. The main entry door lining is installed in three sections, upper, center, and lower, which fit flush against the floor. Each section consists of a flexible foam insulating sheet bonded to a dent resistant rigid foam laminated facing. Each lining section is attached to the door by fairing washer screws around all four sides.
7. Operation
_________
A. Functional Description (Fig. 4)
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