HANDLE MECHANISM
A
Main Entry Door Mechanism
Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TORQUE TUBE CRANK
UPPER GATE
GATE CONTROL ROD
CONTROL ROD
TORQUE TUBE
LATCH CRANK
CONTROL ROD
LATCH ROLLER COCKING CRANK (TYP)
CONTROL ROD
TORQUE TUBE CRANK
TORQUE TUBE LOWER GATE
GATE CONTROL ROD
LATCHING CRANK AND COCKING CRANK
B
Main Entry Door Mechanism
Figure 1 (Sheet 3)
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52-11-00
ALL ú ú 01 Page 4 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
3. Latching Crank and Cocking Crank (Fig. 1)
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A. A control cam, which has two cam surfaces, controls the motion of a latch roller crank and a cocking roller crank (Detail A).
B. The latch roller crank, splined to receive the latch crank, rotates in bearings mounted in the inboard and outboard surfaces of the handle mechanism housing and is secured by the outboard bearing retainer. Two separate control rods, connected to each clevis of the latch crank, connect to the upper and lower torque tube crank (Detail B). An additional clevis on the torque tube crank is connected to the door gate by a control rod. The torque tube, supported by bearings at the door ribs and door frames, extends forward and aft through the torque tube crank to the door frames. Latch rollers, which engage with latch fittings mounted on the doorjamb, are bolted to each end of the torque tube.
C. The cocking roller crank, splined to receive the cocking crank, rotates in bearings mounted in the inboard and outboard surfaces of the handle mechanism housing and is secured by the outboard bearing retainer (Detail A). A control rod transmits angular motion from the cocking crank to the door torque tube.
4. Door Torque Tube (Fig. 2)
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A. On No. 1 entry door, the door torque tube is operated by control rod to rotate the door to the cocked position by transmitting handle torque to the upper and lower hinges (See detail A). The torque tube consists of the upper shaft, crank, center shaft coupling, stop crank, and lower shaft. A crank is splined and bolted to the upper shaft. The upper shaft is splined to receive a center coupling shaft which extends through a bearing assembly. The lower end of the coupling shaft is splined and clamped to the lower shaft. The upper and lower shaft are splined and clamped to the upper and lower hinge arm respectively. The door pivots about the hinge arms in bearings mounted on the upper and lower hinge housings. A guide arm, which functions to control the door arc, is attached to the guide arm fitting within the lower hinge housing.
B. On No. 5 entry door, the door torque tube, operated by the control rod, functions to rotate the door to the cocked position by transmitting handle torque to the upper and lower hinges (Detail B). The torque tube consists of the upper shaft, upper and lower coupling, crank, and lower shaft. The upper shaft, which extends through a bearing assembly, is splined to receive the upper coupling. The lower coupling, bolted to the upper coupling, is splined and clamped to the lower shaft. The upper and lower shafts are splined and clamped to the upper and lower hinge arms respectively. The hinge arms pivot on bearings mounted on the upper and lower hinge housings. A guide arm, which functions to control the door arc, is attached to the guide arm fitting within the upper hinge housing.
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