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747-400 MAINTENANCE MANUAL
~.................................................. | FLUSHNESS AERO-AVERAGING TABLE | | TABLE 501 | .................................................... | Step Height | Step Height | Drag | | Inches *[1] | mm *[1] | Value | .................................................... | 0.07 | 1.77 | 2.88 | .................................................... | 0.08 | 2.03 | 3.45 | 2................…................…................1 *[1] A negative step height is the fairing above the portal
structure. A positive step height is the fairing below the portal structure.
M. Hinge Access Clearance Door Adjustment (Fig. 506)
S 865-073
(1)
Make sure the nose cargo door is closed and latched.
S 225-074
(2)
Make sure the flushness between the hinge access clearance doors and the body skin is -0.03 to 0.06 inch (-0.76 to 1.52 mm).
NOTE: For fair tolerance a negative value is inset to the fuselage
____ structure. A positive value is outward from the fuselage structure.
S 825-075
(3)
Adjust the hinge access door, if it is necessary, to get the correct flushness.
(a)
Measure the flushness.
(b)
Open the nose cargo door to get access to the adjustable rod on the hinge access door.
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747-400 MAINTENANCE MANUAL
(c) Adjust the adjustable rod on the hinge access door to get the correct flushness.
NOTE: One turn of the adjustable rod changes the Dimension A
____ by approximately 0.50 inch (12.70 mm).
(d)
Close and latch the nose cargo door.
(e)
Make sure the flushness is -0.03 to 0.06 inch (-0.76 to 1.52 mm)
(f)
Make sure to tighten locknut and install lockwire.
S 225-076
(4)
With the door fully closed and latched, pull the hinge access door with a force of 20 to 30 pounds and make sure the door does not lift more than 0.010 inch (0.25 mm).##
N.
Nose Cargo Door Warning Switches Ajustment
S 825-077
(1)
Do an adjustment for the warning switches on the nose cargo door (AMM 52-71-00/501), if it is necessary.
O.
Nose Cargo Door System Test
S 735-078
(1)
Do a system test for the nose cargo door.
P.
Put the Airplane Back To Its Usual Condition.
S 865-172
(1)
Make sure the door is fully closed and latched.
S 865-164
(2)
Remove the electrical power, if it is not necessary.
(3)
Remove the safety barrier across the door opening.
S 095-173
TASK 52-31-00-735-079
4. System Test - Nose Cargo Door
_____________________________
A. General
(1)
This procedure has instructions to do a complete test of these nose cargo door systems:
(a)
Dual Control Switches
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C.
D.
E.
F.
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747-400 MAINTENANCE MANUAL
(b)
Pressure switch and isolation relay test.
(c)
Lamp test
(d)
Latch system
(e)
Latch selector switch
(f)
Push-pull cam
(g)
Linear actuator and drive unit
(2)
For a relatively quick check to detect misrigging and deterioration in the rigging of the nose cargo door system, refer to AMM 52-31-00/601.
Special Tools and Equipment 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 舱门 DOORS 2(17)
