(k) Measure the right elevator tab position by the four point method (recommended):
NOTE: This method is more accurate than the single point
____
method but it uses more time.
The result can be different from the single point method due to the waviness of the tab trailing edge.
The fixture must only touch the elevator at the spacers. The permitted difference in thickness of the spacers is
0.005 inch.
1) If you use the C27028 tool (recommended), do the steps that follow: a) Move the digital micrometer to the bottom of the slide. b) Push the button on the micrometer to zero the
micrometer reading.
c) Move the digital micrometer up until it gives the same reading as the calibration value stamped on the side of the tool.
NOTE: This brings the pointer on the micrometer up to
____ approximately 0.3 inch below the trailing edge of the elevator tab.
d) Push the button on the micrometer to zero the micrometer reading.
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2)
3) 4)
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737-300/400/500MAINTENANCE MANUAL
e) Measure the X dimension at four locations (two inboard and two outboard locations).
NOTE: One of the measurements must be at the
____ second tab hinge position which is 35.5 inches from the inboard end of the elevator tab. The other measurements must be taken at the other 3 hinge locations.
The tool used to measure the X dimension should be positioned perpendicular to the elevator tab hinge line. This hinge line runs parallel to the lip of the elevator immediately in front of the elevator tab. The X dimension is measured perpendicular to the lower surface of the elevator. Make sure that the tool is located on a smooth surface of the elevator (avoid rivet and bolt patterns ect.).
If you use the F80248-8 (alternative) rigging fixture or the TE27T-31001-( ) (alternative) rigging fixture, measure the X dimension at four locations (two inboard and two outboard locations).
NOTE: One of the measurements must be at the second
____ tab hinge position. The X dimension is measured perpendicular to the lower surface of the elevator.
Calculate the average of the four X dimensions and refer to
it as the average tab position "V".
Calculate the dimension to be used for the tab adjustment.
NOTE: To make the adjustment easier, a single
____ dimension will be calculated and referenced at the
second hinge.
Dimension used for Tab Adjustment (ADJ) = Measured X at Second Hinge + Tab PostionChange
Where:
The Tab Position Change = Xi dimension (TABLE 503 or 504)
-Measured Average Tab Position
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737-300/400/500MAINTENANCE MANUAL
5) While you move the elevator trailing edge down, align the center of the left elevator trailing edge with the index mark within |0.04 inch or less.
NOTE: Keep the elevators at this position while you do
____ the steps to measure the elevator tab position. If the elevator position is changed, you must put the elevator trailing edge at the full up position and do this step again before you continue.
6) Do these steps again to measure the left elevator tab position by the four point method.
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A 737-300/400/500MAINTENANCE MANUAL
a) 737-300 AIRPLANES; Refer to the table that follows:
NOTE: For the aluminum tab pushrod:
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