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MAINTENANCE MANUAL
ELLIPTICAL LATCH PIN
LATCH PIN FITTING CIRCULAR
Midspan Latch Mechanism Adjustment
Figure 504 (Sheet 2)
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H36662
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747-400
MAINTENANCE MANUAL
FWD
HOOK ACTUATOR
PIN STOP LATCH
BRACKET PIN
2
LATCH ACTUATOR PIN AND STOP BRACKET RETENTION BOLT
LATCH FITTING
LATCH FITTING LATCH CAM
SEE A LATCH FITTING
(10 LOCATIONS)
NO. 1 THRU 3 AND 6 THRU 10
B
A LATCH AFT LATCH CAM LOWER FORWARD B
+0.030 -0.060 0.250 INCH CAM SHAFT LATCH CAM 0.250 |0.030 1
1 INCH
LATCH PIN LATCH
FITTING
FOR PIN STOP
DOORSILL BRACKET INSTALLATION
BEARING PLATE SEE B
FOR LATCH PIN
A FWD (DUMMY LATCH LATCH PIN PIN SHOWN B DIRECTIONS CSEE
1 ADJUST LATCH FITTING TO INSTALLED)
SERRATION CLOSEST TO
SPECIFIED DIMENSION LATCH FITTING
2 PIN STOP BRACKET INSTALLED
LATCH FITTINGS 1-3 AND 6-10 A
Latch Fitting Adjustment
Figure 505 (Sheet 1)
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MAINTENANCE MANUAL
HORIZONTAL POSITION (CUT AND MEASURE CLAY AT THIS POSITION)
POSITION (CUT
CLAY AT THIS
ADJUST LATCH FITTING FOR BEST CONCENTRIC ALIGNMENT OF CAM AND LATCH PIN.
THE MINIMUM CLEARANCE BETWEEN THE LATCH CAM AND THE LATCH PIN IS 0.005 INCH. THE MAXIMUM CLEARANCE BETWEEN THE LATCH CAM AND THE LATCH PIN IS 0.040 INCH.
SECTION B-B SHOWS THE USE OF DUMMY LATCH PINS TO OBTAIN REQUIRED CLEARANCE (IF AVAILABLE).
Latch Fitting Adjustment
Figure 505 (Sheet 2)
H37025
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MAINTENANCE MANUAL
NOTE: NUMBER ADJACENT TO LATCH PIN FITTINGS DENOTE LATCH POSITIONS.
C
C
C
9
DOORWAY
8
LOWER SILL
7 6 FWD
5 4
3 2
1
C-C
SEE D
(EXAMPLE, 5 LOCATIONS)
CORRECT LATCH PIN RETAINING
DIRECTION CLIP 1
DOORWAY LOWER SILL FWD
FITTINGS
D
1, 3, 5, 7, AND 9
1
A RETAINING CLIP IS ADDED TO THE LATCH PIN FITTING TO
PREVENT REVERSE INSTALLATION OF THE LATCH PINS.
Latch Fitting Adjustment Figure 505 (Sheet 3)
10
CORRECT LATCH PIN DIRECTION
FITTINGS 2, 4, 6, 8, AND 10
H37181
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MAINTENANCE MANUAL
FWD
1 ADJUST GUIDE ROLLER LATCH FITTINGS TO MAINTAIN 4.27-4.31 INCHES BETWEEN RAMPS, AND SO THAT GAP BETWEEN ROLLER AND FORWARD RAMP IS 0.001-0.030 INCH, AND SO THAT ROLLER SLIPS FREELY BETWEEN FORWARD AND AFT RAMPS.
HOOK ACTUATOR
LATCH ACTUATOR
GUIDE ROLLER
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