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A
747-400
MAINTENANCE MANUAL
CARGO DOOR HINGE
FWD
____A POSITIVE TOLERANCE SHOWS THE DOOR IS OUTBOARD OF THE FUSELAGE CONTOUR.
NOTE: A NEGATIVE TOLERANCE SHOWS THE DOOR IS INBOARD OF THE FUSELAGE CONTOUR. IN THE SKIN LAP SPLICE AND RUNOUT AREA (CROSS-HATCHED), THE FLUSHNESS TOLERANCES ARE NOT APPLICABLE.
20% OF THE LENGTH OF THE AFT EDGE IS PERMITTED TO HAVE A FLUSHNESS +0.02 INCH MORE THAN THE TOLERANCE SHOWN.
20% OF THE LENGTH OF THE FORWARD EDGE IS PERMITTED TO HAVE A FLUSHNESS -0.02 INCH MORE THAN THE TOLERANCE SHOWN.
8% OF THE LENGTH OF THE FORWARD EDGE IS PERMITTED TO HAVE A FLUSHNESS +0.02 INCH MORE THAN THE TOLERANCE SHOWN.
10 INCHES MAXIMUM, OF THE AFT EDGE IS PERMITTED TO HAVE A FLUSHNESS -0.06 INCH MORE THAN THE TOLERANCE SHOWN.
IF YOU CANNOT GET THIS DIMENSION CORRECT WHEN THE OTHER CONTOURS ALIGN CORRECTLY, IGNORE THIS DIMENSION
Cargo Door Fair Tolerances
Figure 507
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52-34-00
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747-400
MAINTENANCE MANUAL
1
2
DOORWAY
LOWER SILL
3
LATCH PIN INSTALLATION DIRECTION
4
(EXAMPLE)
SEE A
5
FWD
6
7 LATCH PIN INSTALLATION LOCATION
8
DOORWAY LOWER SILL
FITTINGS
1, 3, 5, 7
RETAINING CLIP
(SHOWN INSTALLED)
LATCH PINS FACE TOWARDS
EACH OTHER ON EACH PAIR
FITTINGS
2, 4, 6, 8
FWD
LATCH PIN INSTALLATION DIRECTION (EXAMPLE)
____ NUMBERS ADJACENT TO LATCH PIN FITTINGS A
NOTE: DENOTE LATCH POSITIONS.
Forward/Aft Cargo Door Latch Pin Installation Direction
Figure 508
H40344
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52-34-00
INSTALLATION DIRECTION ú ú 04 Page 532 ú Feb 15/99
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MAINTENANCE MANUAL
3) Move the bearing housings in or out as necessary to get the clearance between the pull-in hook and the hook pin shown in Fig. 502, View A.
4) Make sure the serrations on the bearing housing and the serration plates are correctly engaged and tighten the nuts and bolts.
5) Examine again the flushness and adjust as necessary.
S 825-062
(7) Adjust the gap between the end face of the hook pin and the pull-in hook as follows:
NOTE: This procedure should be done after a hook pin or a pull-in
____ hook has been replaced (AMM52-34-24/401). Also, make sure that the hook "rigged open" position is properly set.
(a)
Make sure that the airplane is on its gear and its operating weight is zero.
(b)
Make sure the hooks are in the full open position against their external stops (View A, Fig. 502).
(c)
Make sure neither hook pin is in contact with its mating hook (View A, Fig. 502) and that there is also no contact at either centering guide roller (View B, Fig. 502).
(d)
Measure the clearance between the throat of the hook and the end of the hook pin as shown (View B-B, Fig. 502).
NOTE: The forward hook of the aft cargo door is the only hook
____ that the adjustment is applicable to and only if it fails to meet the minimum clearance.
(e) Adjust the clearance if necessary using the spacer washers until the gap is correct (AMM52-34-24/401).
S 825-011
(8) Adjust the latch mechanism (Fig. 503):
CAUTION:_______IN CASE THE DOOR DOES NOT OPEN, STOP IMMEDIATELY. DO NOT OPERATE THE DOOR CONTROL SWITCH. HOLDING THE DOOR CONTROL SWITCH MAY DAMAGE THE ACTUATOR. WAIT AT LEAST 1 MINUTE BEFORE SECOND ATTEMPT. IF THE DOOR STILL DOES NOT OPEN, WAIT AT LEAST 10 MINUTES BEFORE THIRD ATTEMPT.
(a)
Open the door to get access to the latch cams.
(b)
Adjust the latch cam rigged-closed position:
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