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 D.  You can control the cargo operation of zones 2 and 3 from the master cargo control panel or the side door cargo control panel. The master cargo control panel always controls the nose zone 1.
 E.  The cargo handling system is normally operated by one, two, or three crews. Each crew has a loadmaster and a cargo controller.
 F.  The loadmaster can be at the master cargo control panel, the side door cargo control panel, or the remote cargo control panel. The cargo controller can be at any of the local cargo control panel. The loadmaster programs the cargo drive system operation and controls all cargo movement in and out of the airplane.
 G.  Electrically powered movement of cargo units throughout the main deck compartment is accomplished by powered drive wheels or power drive units (PDUs) installed in the main deck floor. The PDUs are controlled by the cargo control panels installed on the sidewalls on each side of the compartment. Manual disengage controls are provided for each PDU to permit mechanical disengagement of PDU drive wheel from the drive wheel actuator for free wheeling of the drive wheel in the event of a malfunction.
 H.  The P415 right main power distribution center panel supplies system control power from the 28-volt dc ground handling bus, and system motive power from the 115/200-volt, 400-hertz, 3-phase main deck cargo handling bus.
 I.  An intercom system is for communication between the loadmaster and the cargo controller. For further information on the intercom system control panel, refer to 23-46-00/001, Cargo Intercom System.
 J.  The main deck cargo handling system operates jointly with the main deck cargo restraining system. The cargo restraining system consists of guides and restraints for securing cargo units against lateral, longitudinal and vertical movement, once the cargo units have been positioned on the main deck. For further information on the cargo restraining system, refer to 25-58-00/001, Main Deck Cargo Restraining System.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SILL/ROLLER NONSTEERABLE
ASSEMBLY PDU (REF) SEE A
LOCK TRAY RETRACTABLE SEE G
GUIDE RAIL
SEE D
SIDE LOCK
PARK RAIL SEE I
SEE K
ADJUSTABLE GUIDE RAIL
SEE E
SIDE LOCK
SEE J
CASTER TRAY
SEE B
ELECTRICALLY STEERABLE PDU (REF)
RETRACTABLE
CENTERLINE

TRAY MOUNTED
BUMPER
PDU
SEE L

(REF)
FIXED CENTERLINE BUMPER
SEE M
FORWARD SECTION

Main Deck Cargo Compartment Cargo Handling System
Figure 1 (Sheet 1)

L50206
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

ROLLER TRAY
C
LOCK/ROLLER TRAY
SEE
F
SIDE GUIDE RAIL

SEE
N
FIXED CENTERLINE BUMPER
SEE

 

MID SECTION

Main Deck Cargo Compartment Cargo Handling System
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L50219
A
747-400
MAINTENANCE MANUAL

RETRACTABLE/ STEERABLE PDU (REF)
RETRACTABLE
CENTERLINE
BUMPER

SEE L
SIDE CARGO
DOOR SILL

SEE O
CASTER PANEL
SEE P
FIXED CENTERLINE BUMPER
SEE M
TRAY MOUNTED PDU (REF)
ELECTRICALLY STEERABLE PDU (REF)
SIDE
RESTRAINT

AFT STOP TRAY
SEE H
AFT SECTION
Main Deck Cargo Compartment Cargo Handling System
Figure 1 (Sheet 3)

L50228
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