52-49-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b)
To open the door manually from the inside, the internal trigger is rotated aft to release the handle and a downward force is applied at spring retainer.
(c)
Opening of the door by a pressure differential acting on the door is accomplished when the pressure inside is 0.75 to 1.25 psi greater than outside. The cantilevered roller latches are rotated by the pressure exerted at these points. Rotation of the roller latches rotates the torque shaft which (when the blowout load reaches 220 pounds at each roller) overcomes the internal spring load on the latch and unlatches the door. With a blowout opening, the external latch remains closed and flush with the door.
B.
Control
(1)
Stabilizer Jackscrew Access Door (Fig. 5)
(a)
Open jackscrew access door manually from outside by depressing trigger and allowing latch handle to drop.
(b)
Grasp latch handle and rotate down approximately 90 degrees to withdraw rollers.
(c)
Rotate door open (down and forward) until upper and lower detents engage.
(d)
Open door manually from inside by rotating internal trigger aft and applying downward force to spring retainer.
(e)
To close access door, depress lower detent and rotate door closed (upper detent will be released as door closes).
(f)
Rotate latch handle to closed (flush) position engaging rollers and trigger.
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52-49-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
EXTERNAL POWER RECEPTACLE DOOR - REMOVAL/INSTALLATION
_____________________________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The removal of the door at the external power receptacle (referred to as the door)
(2)
The installation of the door at the external power receptacle.
TASK 52-49-01-004-001
2. External Power Receptacle Door Removal (Fig. 401)______________________________________
A. References
(1)
IPC 52-49-01 Fig. 1
B.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH
(2)
Access Panel 118A Door - Access, External Power Receptacle
C.
Procedure
S 014-002
(1)
Open the door.
S 024-003
(2)
Remove the door.
(a)
Remove the three screws that hold the hinges to the structure.
(b)
Remove the door from the airplane.
TASK 52-49-01-404-004
3. External Power Receptacle Door Installation (Fig. 401)___________________________________________
A. Standard Tools and Equipment
(1)
Bonding Meter (Ref 20-22-01/601)
B.
Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(2)
C00259 Enamel-Primer - BMS 10-11, Type I
(3)
C00523 Coating - Alodine, MIL-C-5541
(4)
G00034 Cheesecloth-Dry, Lint Free
C.
References
(1)
20-22-01/601, Electrical Bonding
(2)
51-21-04/701, Alodized Surfaces
(3)
51-24-04/701, Abrasive Resistant Teflon Finish
(4)
IPC 52-49-01 Fig. 1
D.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH
(2)
Access Panel 118A Door - Access, External Power Receptacle
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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