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747-400 MAINTENANCE MANUAL
 D. Prepare to measure the skin
 NOTE: The contour measurement accuracy is critical to correctly assess
____ the waviness of the pitot-static area. The tool is lightweight, but requires two people to support the tool correctly and take the necessary measurements. It is recommended that a third person record the measurements.
 NOTE: A large measurement error can occur if improper pressure is
____ applied to the tool during the measurement process. Always hold the tool against the skin at the leg positions, not on the center of the beam, because the beam will bend and you will get an incorrect measurement.
 S 836-008
 (1)  Measure the skin at 170 points on each side of the airplane in the area of the pitot-static probes, Fig. 603 for 5 inch probes or Fig. 605 for 10 inch probes.
 NOTE: If the area to be measured is wet, then wipe it dry with a
____
 non-abrasive cloth.

 (a)  
Position the tool at a Body Waterline.

 (b)  
Hold both aft feet against the skin.

 NOTE: Do not push hard against the skin.
____
 (c)  Hold the forward end of the tool against the skin.
 NOTE: Do not push hard against the skin.
____
 NOTE: If only one forward foot contacts the skin, then take
____ the measurement with only one forward foot against the skin. Do not force both forward feet against the skin because it will rock one of the aft feet of the tool off of the skin. It is more important that both aft feet contact the skin.
 NOTE: The forward feet will touch the skin 0.75 to 1.00 inch
____ aft of the forward tooling point locations.
 (d)
Locate the plunger at the desired BSTA index location.

 (e)  
Lock the knob that securely holds the carriage stationary.

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747-400 MAINTENANCE MANUAL
 (f)  
Push the plunger down until the plunger contacts the skin and lock it down.

 (g)  
Record the measurement.

 (h)  
Unlock the plunger and the carriage.

 (i)  
Repeat steps (e) thru (i) for each BSTA index along the first Body Waterline.

 (j)  
Repeat steps (a) thru (j) at each Body Waterline until all 170 points on each side of the airplane have been measured.

 NOTE: At Body Waterline 192, move the tool up approximately
____ 0.5 inch up from the WL 192 reference markings. This will allow the sliding carriage to clear the lower pitot-static probge.
 S 836-009
 (2)  Analyze the data that you recorded on Fig. 604 for 5 inch probes or Fig. 606 for 10 inch probes.
 (a)  If the readings are less than the waviness limits, then the airplane is qualified to be flown with RVSM upon applying for regulatory agency approval, if not already completed.
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747-400
MAINTENANCE MANUAL

Reduced Vertical Separation Minimum (RVSM)
Skin Smoothness Inspection Tool
Figure 601

F42118
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MAINTENANCE MANUAL

STA
260
280
300 320
340
FWD

Skin Waviness Measurement
Figure 602

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