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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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