F.
Open The Nose Cargo Door

 S 862-005
 CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
 (1)  Simultaneously hold the control switches until the nose cargo door is fully opened.
 NOTE: Door will fully open in approximately 2 minutes.
____
 NOTE: When the door opens or closes it can make unusual noise when
____ the latch pins engage the spherical bearings.
 S 862-014
 (2)  
See that the blue DOOR UP light on the H121 panel is on.

 (3)  
Release the System Power and the Door Control switches.

 S 862-016

 (4)  
See that the POWER ON light on the H121 panel is off.

 G.
Close the Nose Cargo Door

 S 862-015
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-007
 CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
 (1)  Simultaneously hold the control switches until the nose cargo door is fully closed.
 NOTE: When the door opens or closes it can make unusual noise when
____ the latch pins engage the spherical bearings.
 S 842-029
 (2)  
Momentarily hold the System Power switch in the OFF/LOCK TEST position.

 S 212-030

 (3)  
See that the POWER ON light is off.

 S 212-031

 (4)  
See that the green LOCK-OUT ENGAGED light is off.

 S 212-032

 (5)  
See that the green LATCHES CLOSED light is off.

 S 212-033

 (6)
See that the green CLOSED lights on the H548 panel are on.

 S 212-034

 (7)
See that the green LATCHED lights on the H449 panel are on.

 H.
Put the Airplane Back To Its Usual Condition.

 S 212-009
 (1)  
Make sure the door is fully closed, latched and locked.

 (2)  
Remove the electrical power, if it is not necessary.

 (3)  
Remove the safety barrier across the door opening.

 S 082-010
 S 092-011
 TASK 52-31-00-982-002
 3. Nose Cargo Door Manual Operation
________________________________
 A. General
 (1)  This task gives instructions to manually open and close the nose cargo door when the electrical power is not available or the system on the nose cargo door is not serviceable.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Special Tools and Equipment
 (1)  
MIT65B80430 - Alternate Drive Extension, Nose Cargo Door Lift Actuator (2 quantities)

 (2)  
3/8-inch drive speed handles for manual operation of MIT65B80430 (2 quantities)

 (3)  
Commercial reversible air motors - 3000 RPM, no load maximum and 35 pound-inches minimum torque for power operation of MIT65B80430 (2 required)

 (4)  
Adapter - 0.250-Inch Hex to 0.375-Inch Square Tang - Drive motors to MIT65B80430 connection.

 (5)  
Speed Handle or Ratchet - l/4-inch hex drive socket - Manual operation of latch actuators

 (6)  
2MIT65B80430 Dual Outlet Rectifier Box

 NOTE: This tool used to rectify 400-Hz airplane electrical power to
____ dc utility power as an alternate means of supplying power to electric motors when used to drive MIT65B80430.
 (7)  
Rig Pin ND-2 - 0.311-inch diameter, 2 inches long (2 quantities)

 (8)  
PRE65B13015 Safety Barrier - Nose Cargo Door
　
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