(b)  
Push the plunger down until it contacts the flat level surface.

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A 747-400 MAINTENANCE MANUAL
 (c)  Verify that the tool reads 5.500 inches +/- 0.003 inches.
 NOTE:____ If the tool does not read 5.500 inches +/- 0.003 inches, then unlock the dial gage and set the tool so that it reads 5.500 inches +/- 0.003 inches.
 NOTE:____ The correct measurement tool reading is the sum of the plunger scale reading and the dial gauge reading.
 (d)  Lock the dial in place.
 (e)  Take two other measurements along the flat level surface to verify that the tool is within tolerance.

 S 826-004
 (2)  Calibrate the dial gauge.
 NOTE: The dial gauge should be calibrated immediately prior to each
____ airplane being measured. The dial gauge can be calibrated at room temperature. The temperature at which the dial gauge is calibrated does not have a significant impact on the accuracy of the dial gauge.
 (a)  
Set the plunger at 5.000 inches.

 (b)  
Unlock the dial and rotate it until it reads 0.000 inches.

 (c)  
Lock the dial in place.

 NOTE: Do not unlock the dial until all of the measurements
____
 have been taken on this airplane.

 S 026-005
 WARNING: DO NOT MEASURE THE AIRPLANE WHEN THE PITOT PROBES ARE HEATED.
_______ THE PROBES OPERATE AT APPROXIMATELY 1000 DEGREES FAHRENHEIT AND PERSONS CAN BE SEVERLY BURNED IF THEY COME IN CONTACT WITH THE PROBE.
 (3)  Disable the pitot heat system.
 (a)  Open the "PITOT HEAT" circuit breaker and attach a "DO NOT REMOVE" tag on the overhead circuit breaker panel.
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A
747-400
MAINTENANCE MANUAL

 S 416-006
 (4)  Install the mylar Waterline Reference Templates (WRT's) on the sides of the airplane (fig. 602).
 NOTE: The templates are used to position the legs of the skin
____ smoothness measurement tool. Correct tool positioning is critical for data accuracy. There are four templates; two for Body Station 280 (right and left) and two for Body Station 240 (right and left).
 NOTE: The WRT'S provide all of the necessary frame, bulkhead,
____ stringer and rivet location information in the area of the pitot-static probes.
 S 936-014
 (5)  AIRPLANES WITHOUT NOSE CARGO DOOR; Do the following steps:
 NOTE: The templates are used to position the legs of the skin
____ smoothness measurement tool. Correct tool positioning is critical for data accuracy. There are four templates; two for Body Station 280 (right and left) and two for Body Station 240 (right and left).
 NOTE: The WRT'S provide all of the necessary frame, bulkhead,
____ stringer and rivet location information in the area of the pitot-static probes.
 (a)  
Align the templates with the correct BSTA frame line of fasteners.

 (b)  
Index the template to the Stringer 24A row of fasteners.

 (c)  
Secure the templates to the airplane with masking tape.

 (d)  
Temporarily mark the tooling point locations on both forward and aft sides of the airplane.

 NOTE: These marks are used to position the forwaed and aft
____ facing upper foot of the skin measurement tool. The upper foot of the mesasurement tool may not contact the mark when the tool is held in position. The upper forward foot may be up to 0.75 inch aft of the mark.
 (e)  Remove the templates from the airplane.
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