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 52-31-02
 ALL  ú ú 03 Page 405 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (3)  
52-31-02/601, Nose Cargo Door Linear Actuator

 E.
Access

 (1)  
Location Zones
 801 Nose Cargo Door

 F.
Prepare For Installation

 S 224-009
 (1)  
If you install the used components, do a check for wear limits (Ref 52-31-02/601).

 S 864-010

 (2)  
Make sure the push-pull cam and actuator are in the correct positions before you adjust the linear actuators.

 S 214-011

 (3)  
Make sure the aft end fittings on the two linear actuators are not connected to the support fittings.

 S 864-012

 (4)  
Supply electrical power (Ref 24-22-00/201).

 S 864-013

 (5)
Close these circuit breakers and attach the DO-NOT-OPEN tags:

 (a)  
On the Auxilary External 2 Power Center-Right panel P715: 1) 715XX, NOSE CARGO DOOR

 (b)  
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL

 (c)  
On the Nose Cargo Door Power panel H122:
 1) 122XX, DOOR LIFT
 2) 122XX, PULL UP CAM
 3) 122XX, LATCHES 1-4R
 4) 122XX, LATCHES 1-4L
 5) 122XX, LATCHES 5-8R
 6) 122XX, LATCHES 5-8L

 S 864-028
 (6)  
Operate the nose cargo door until the push-pull cam is in the fully open position as shown in Detail A, Fig. 401.

 S 214-029

 (7)  
Make sure the push-pull cam touches the cam rollers
 (Detail A, Fig. 401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-31-02
 ALL  ú ú 02 Page 406 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-015
 (8)  
Open this circuit breaker and attach the DO-NOT-CLOSE tag:

 (a)  
On the Nose Cargo Door Power panel H122:
 1) 122XX, PULL UP CAM

 S 864-016
 (9)  
With the aft ends on the two linear actuators disconnected, hold door switch in CLOSE position until the door drive unit stops running.

 S 864-002

 (10)
 Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the Auxilary External 2 Power Center-Right panel P715: 1) 715XX, NOSE CARGO DOOR

 (b)  
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL

 (c)  
On the Nose Cargo Door Power panel H122:
 1) 122XX, DOOR LIFT
 2) 122XX, LATCHES 1-4R
 3) 122XX, LATCHES 1-4L
 4) 122XX, LATCHES 5-8R
 5) 122XX, LATCHES 5-8L

 G.
Linear Actuator Installation

 S 424-018
 (1)  
Install the linear actuator on the lower gimbal fitting with the drive shaft coupling inboard (Fig. 401).

 (a)  
Install the upper gimbal fitting on actuator with bolts, washers and nuts (Detail D).

 (b)  
Install the bolthead inboard and countersunk washer under bolthead.

 (c)  
Tighten bolts 450 inch-pounds.

 S 834-019
 (2)  
Manually adjust the actuator length through the manual drive port until you can install ND-2 rig pin freely through the rig pin hole on actuator (Detail A, Fig. 402).

 S 434-020

 (3)  
Install the aft end fittings of the two linear actuators to the support fittings (Detail C).

 (a)  
Install the forward pin and cross bolt with washer and nut.

 (b)  
Tighten nut.

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