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 (2)  S 976-011Include the following information:
 (a)  The Service Bulletin Number.
 The airplane serial number.
 The number of flight cycles and hours on the airplane.
 (3)  S 976-012Send the data and reports of the skin waviness and RVSM to Boeing through the field service representative or directly to:
 (a)  Boeing Commercial Airplane Group P.O. Box 3707 Seattle, Washington 98124 Attn: Director, 747/767 Service Engineering Org. M-7240, Mail Stop 04-CR
 (4)  S 976-013Boeing will review all requirements immediately. Boeing will, if contracted, do a Computational Fluid Dynamics (CFD) analysis on the data.
 NOTE:____ Boeing will notify the operator if the CFD analysis shows the skin waviness is within acceptable limits. If the CFD analysis shows that the skin waviness is not within acceptable limits, Boeing will notify the operator of the necessary corrective action.

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747-400 MAINTENANCE MANUAL
 DOOR AND HATCH LEAK CHECK - INSPECTION/CHECK
____________________________________________
 1.  General_______
 A.  This procedure has this task:
 (1)  Doors and Hatches Leak Check
 TASK 51-11-00-286-011
 2.  Doors and Hatches Leak Check____________________________
 A.  General
 (1)  This task is for the door and hatch leak check.
 B.  Equipment
 (1)  
ST6760A-1, Ultrasonic Leak Probe Tool

 (2)  
ST9999-VBA-201, Vacuum Generator (No. 2 window, door and hatch)

 (3)  
ST9999-VB, Door and Hatch Vacuum Blanket

 C.  Procedure
 S 846-012
 (1)  Do the steps that follow to prepare the vacuum blanket:
 (a)
Calibrate the ultrasonic leak detector as follows:

 1)  Use the white noise generator to set the PASS/FAIL indication to 40dB.

 (b)  
Connect the vacuum generator to the vacuum blanket.

 (c)  
Connect the vacuum generator to a compressed air source.

 S 486-013
 (2)  Install the vacuum blanket over the exterior of the door or hatch.
 (a)  
Make sure the vacuum blanket covers the entire exterior of the door or hatch and the gap between the door or hatch and the fuselage.

 (b)  
Remove all bubbles and creases.

 (c)  
Make sure the vacuum gauge indicates 18 to 20 inches (HG) of vacuum when the blanket is attached to the door or hatch.

 S 276-014
 (3)  Do a check of the noise levels around the interior of the door or hatch that you test as follows:
 (a)  
Hold the ultrasonic leak detector approximately 2 inches from the door or hatch.

 (b)  
Move the ultrasonic leak detector around the edge of the door or hatch.

 (c)  
Use the headphones and watch the noise meter on the ultrasonic leak detector.

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747-400 MAINTENANCE MANUAL
 S 816-015
 (4)  If the noise levels are more than ed 40dB do the steps that follow:
 (a)  
Determine the exact location of the noise with a stethoscope.

 (b)  
Remove the vacuum blanket from the door or hatch.

 (c)  
Make sure the door seal or hatch seal is clean and in good condition; free from wrinkles, kinks, cracks, rips, tears, etc. 1) If you find wrinkles, kinks, cracks, rips, tears, or other

 types of damage, do the applicable replacement.

 (d)  
Install the vacuum blanket again and check for leaks.

 NOTE: You will have to repeat the installation of the vaccum
____ blanket and do a check for leaks to make sure all the leaks have been corrected.
 (e)  
If the seal does not need to be replaced do the applicable door or hatch adjustments.
　
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