(4)  
Torque Wrench Adapter - 1/4-inch drive to 3/8-inch drive.

 B.  PRESSURE RELIEF DOORS WITH FOUR (STUD AND CLIP) FASTENERS;
 Do this check with the push/pull gage.

 S 015-055
 (1)  
Open the TE fairing doors (AMM 54-62-00/201), if not already open.

 S 495-056

 (2)  
Put a small piece of aluminum plate, 1-inch by 1-inch and 1/10-inch thick, stock at center of the inside face of the pressure relief door.

 NOTE: This is to spread load over honeycomb door material.
____
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747-400 MAINTENANCE MANUAL
 S 725-057
 (3)  Firmly support the TE fairing door and use the push/pull gage to slowly push against the center of the door (and plate). The pressure relief door should release when gage indicates 85-105 pounds.
 NOTE: Make sure that you apply the force to the center of the door
____
 perpendicular to door surface.

 S 905-058
 CAUTION: REPLACE OR REPAIR A DOOR WHICH DOES NOT RELEASE IN THE LIMIT.
_______ DAMAGE CAN OCCUR TO TE FAIRING DOOR IF PRESSURE RELIEF DOORS ARE RESTRAINED DURING EXCESSIVE PRESSURE.
 (4)  
If release load, as measured by push/pull gage, is not within limits, replace all four studs and spring clips or replace pressure relief door and frame. Repeat the check.

 S 015-060

 (5)  
If release load, as measured by push/pull gage, is within limits, close the pressure relief door.

 S 415-061

 (6)  
Close the TE fairing doors (AMM 54-62-00/201).

 C.  PRESSURE RELIEF DOORS WITH SPRING-LOADED TOGGLE LATCHES; Do this check with the Torque Adapter.
 NOTE: This procedure is an alternative to the preferred procedure
____ which uses the torque adapter and pivot support assembly.
 S 945-069
 (1)  Assemble the torque adapter tool, torque wrench, and torque wrench adapter.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 725-070
 (2)  
Put the torque adapter tool into the latch opening slot.

 S 725-071

 (3)  
Turn the torque wrench to find the torque that is necessary to release the latch.

 S 725-072

 (4)  
Remove the torque adapter tool.

 S 725-073

 (5)  
Measure the distances Lw and D. Calculate the correct torque values for the necessary release load (Fig. 501).

 S 725-074

 (6)  
Compare the calculated torque with the torque required range.

 S 825-080

 (7)  
If release load, as measured by the torque wrench, is not in limits, repair or replace the pressure relief door and do the check again.

 S 865-076

 (8)  
If the release load is within the limits, close the door
 (AMM 54-62-00/201).

 D.  TE FAIRING DOOR SPRING LOADED TOGGLE LATCHES; Do this check with the push/pull guage (alternative to B71044-10).
 S 015-062
 (1)
Open the TE fairing doors (AMM 54-62-00/201), if not already open.

 S 495-063

 (2)  
Make sure the end of the push pull gage is protected to prevent damage to the pressure relief door.

 S 725-064

 (3)  
Firmly support the TE fairing door and use the dial push/pull gage to slowly push against the upper or lower aft mounting fastener of the latch mechanism. The pressure relief door should release when the gage indicates 90-110 pounds.

 NOTE: Make sure force applied to the aft mounting fastener of
____ the latch mechanism is perpendicular to door surface.
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