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A
737-300/400/500MAINTENANCE MANUAL
 D.  Do the test of the latch with a Torque Adapter and Pivot Support Assembly or a Dial Pull Gage.
 NOTE: The Torque Adapter and Pivot Support Assembly procedure is the
____
 preferred alternative to the Dial Pull Gage procedure.

 S 822-043-B00
 (1)  
Airplanes with pressure relief doors that have spring loaded over center release hinges, do a release load check (Fig. 201, Sh. 3).

 S 432-044-B00

 (2)  
Attach the tool adapter assembly to the pressure relief door latch with two screws, washers and nuts finger tight (Fig. 201 Sh. 3).

 S 432-045-B00

 (3)  
Attach the pivot support assembly and torque wrench to the adapter assembly.

 S 722-046-B00

 (4)  
With the torque wrench handle parallel to door edge, turn the handle until the latch releases, noting the torque required.

 S 282-047-B00

 (5)  
Compare the torque just noted with the requirements.

 NOTE: The adapter tool assembly increases torque applied to the
____ latch by a factor of two (2x). For example, a release load of 55 pounds requires a torque wrench setting of 27.5 pound-inches.
 S 032-048-B00
 CAUTION: YOU MUST REPLACE OR REPAIR ALL DOOR LATCHES THAT DO NOT RELEASE
_______ CORRECTLY. TOO MUCH FORCE ON THE LATCH CAN CAUSE DAMAGE TO THE DOORS.
 (6)  If the release load is not within limits, replace the latch or replace the door.
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A 737-300/400/500MAINTENANCE MANUAL
 E. To replace the latch, do these steps:
 S 422-050-B00
 (1) Put the replacement latch, shims and wear plate on the door sill.
 (a)  Make sure the finished side of the wear plate is against the shims.
 S 422-054-B00
 (2)  
Install the bolts, washers and nuts.

 S 212-055-B00

 (3)  
Do a release check of the repaired door assembly.

 S 822-051-B00

 (4)
If the load is within limits, close the door (AMM 54-31-01/401).

 F. Dial Pull Gage procedure:
 S 012-002-B00
 (1)  
Open the pressure relief door of the forward fairing (Fig. 201) (AMM 54-31-01/401).

 S 822-003-B00

 (2)  
Turn the screwdriver clockwise to put the latch bolt in the closed position.

 S 822-004-B00

 (3)  
Turn the screwdriver clockwise for 5 degrees more.

 (a)  With the closed position at 0 degrees and the fully open position at 45 degrees, this puts the latch bolt in the -5 degree position.
 S 822-005-B00
 (4)  
Remove the screwdriver from the latch handle slot.

 S 822-006-B00

 (5)  
Tightly hold the pressure relief door.

 S 822-007-B00

 (6)  
With the dial gage, slowly pull the latch bolt open with a constant force (Fig. 201).

 S 822-008-B00

 (7)  
Do a check that the force to move the latch bolt from the -5° position to more than +5° position is 45-55 pounds (195-245 Newtons).

 (8)
If the force is more or less than the limits, replace the latch.

 S 822-056-B00
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A 737-300/400/500MAINTENANCE MANUAL

DOOR
FORWARD FAIRING PRESSURE RELIEF DOOR

0.03-0.06 INCH (0.76-1.5 mm)
0.03-0.09 INCH (0.76-2.3 mm)

0.07-0.10 INCH(1.8-2.5 mm)
A-A
Forward Fairing Pressure Relief Door Installation Figure 201 (Sheet 1)
A13438
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