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A 747-400 MAINTENANCE MANUAL
BEARING HOUSING-MASTER LATCH LOCK SECTOR TORQUE TUBE

MASTER LATCH LOCK SENSOR
(10 LOCATIONS)

Master Latch Lock System Inspection/Check

Figure 602 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
SWITCH
STRIKER

MASTER LATCH LOCK SWITCH, S2 OR 1240
MASTER LATCH LOCK SECTOR
CARGO DOOR LOWER BEAM
OPEN (UNLATCHED)
LATCH CAM
(ON DOOR)

LATCH PIN FITTIING (ON DOOR SILL)
INBD
B-B (LATCHES OPEN, DOOR UNLOCKED)
CLOSED (LATCHED)
LATCH CAM
(ON DOOR)

LATCH PIN FITTIING (ON DOOR SILL) MASTER LATCH LOCK SWITCH, S2 OR 1240
SWITCH STRIKER
MASTER LATCH LOCK SECTOR
CARGO DOOR
LOWER BEAM

INBD
B-B
(LATCHES CLOSED, DOOR LOCKED)

Master Latch Lock System Inspection/Check
Figure 602 (Sheet 3)

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A

747-400
MAINTENANCE MANUAL

MAIN DECK SIDE CARGO DOOR
10
9
DOORWAY
LOWER SILL

8
SEE A
7 6 FWD
5 4
3 2 DOORWAY LOWER SILL
1
A

ONE OF
FIVE PAIRS

SEE B
RETAINING
CLIP

FITTINGS 1 2, 4, 6, 8, AND 10
DOORWAY
LOWER SILL

LATCH PINS FACE TOWARD EACH OTHER IN EACH PAIR
FWD
B
FITTINGS 1, 3, 5, 7, AND 9
NOTE: NUMBERS ADJACENT TO LATCH PIN FITTINGS DENOTE LATCH POSITIONS.
1
A RETAINING CLIP IS ADDED TO THE LATCH PIN FITTING TO
PREVENT REVERSE INSTALLATION OF THE LATCH PINS.

Main Deck Side Cargo Door Latch Pin Direction Inspection Figure 603
H15735
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A
747-400 MAINTENANCE MANUAL
 S 866-030
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR AND
 THE DOOR OPENING WHEN YOU OPERATE THE DOOR.  FAILURE OF THE
 LIFT MECHANISM CAN CAUSE THE DOOR TO CLOSE QUICKLY WHICH CAN
 CAUSE INJURY OR DAMAGE.

 CAUTION:  TO ENSURE PROPER CHECK OF THE ADJUSTMENT OF THE SIDE CARGO DOOR, THE FOLLOWING REQUIREMENTS APPLY: AIRPLANE SHOULD BE ON ITS GEAR: TAIL JACK SHOULD NOT BE INSTALLED, AND THE AFT BODY SHOULD NOT BE LOADED WITH CARGO.
 (1)  
Open the door electrically (Ref 52-32-00/001).

 S 726-020

 (2)  
Do a check of the adjustment of the door up switch.

 (a)  
Measure the clearance at the upstops of the rotary actuators.

 (b)  
Make sure the clearance is from 0.09 to 0.21 inches (See detail A).

 (c)  
Adjust the door up switch if the clearance is not correct (Ref 52-32-00/501).

 S 866-004
 (3)  
Close the door electrically (Ref 52-32-00/001).

 S 726-021

 (4)  
Do a check of the adjustment of the lift mechanism.

 (a)  
Measure the clearance at the downstops of the rotary actuators.

 (b)  
Make sure the clearance is from 0.06 to 0.18 inches (Detail A).

 (c)  
Make sure you can turn the rotary actuator links with your hand.
　
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