(2)
The manual operation of the nose cargo door
(3)
The nose cargo door opening with the totally inoperative latch actuator
(4)
The electrical closure of the latch actuators with the nose cargo door open
(5)
The functional check of the torque that is necessary to turn the latch actuators.
B.
All components of the nose cargo door can be actuated manually. Each of the 16 latch actuators must be actuated separately followed by the cam actuator. When the cam actuator has been fully extended, the door can be raised using an alternate drive extension power by two air or electric motors. A dual outlet rectifier, 2MIT65B80430, is available to convert airplane power for using electric motors if external power is not available. If electrical or pneumatic power is not available, each alternate drive extension can be operated with 3/8-inch drive speed handles.
TASK 52-31-00-912-001
2. Nose Cargo Door Normal Operation
________________________________
A. General
WARNING: DO NOT OPERATE THE DOOR IF ONE OR THE OTHER ACTUATOR SHEAR PINS
_______ ARE BROKEN. YOU MUST REPLACE THEM BEFORE YOU OPEN THE DOOR. IF YOU DO NOT REPLACE THEM, INJURY OR DAMAGE CAN OCCUR.
(1)
To open/close the door, simultaneously hold the SYSTEM POWER switch in the POWER ON position and the DOOR CONTROL switch in the OPEN/CLOSED position. In this procedure, these switches are refered to as the control switches.
B.
Special Tools and Equipment
(1)
PRE65B13015 Safety Barrier - Nose Cargo Door
C.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 52-31-00/501, Nose Cargo Door Adustment/Test
D.
Access
(1)
Location Zone
801 Nose Cargo Door
E.
Prepare For Operation
(1)
Supply electrical power (AMM 24-22-00/201).
(2)
Install the safety barrier across the door opening.
S 482-002
S 492-003
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A
747-400
MAINTENANCE MANUAL
PUSH-PULL CAM ACTUATOR
FWD
Nose Cargo Door Rigging Position
Figure 201
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B26808
A
747-400 MAINTENANCE MANUAL
LINEAR ACTUATOR (2 LOCATIONS)
DRIVE
SEE AFWD
COUPLING
FLEXIBLE
DRIVE
SHAFT
AFT END OF
AFT END ACTUATOR SHAFT
FITTING
RIGGING PIN
ND-2
INSPECTION HOLE RIG POSITION AFT END OF ACTUATOR SHAFT
DOOR LATCHED POSITION END OF SHAFT TO
BE IN THIS AREA
A
Linear Actuator Adjustment
Figure 202
B26812
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A
747-400 MAINTENANCE MANUAL
S 862-004
(3)
Make sure these circuit breakers are closed:
(a)
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR (115V AC)
(b)
On the Power Distribution Center-Right panel P415: 1) 415F16 NOSE CARGO DOOR CONT (28V DC)
(c)
On the Nose Cargo Door Power panel H122:
1) LATCHES 5-8 LEFT
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