Note. Do not use the adjusting crew to acquire the correct reading. The pointer must be set correctly before
tightening the clamping or.
e. Replace the plastic window, bezel ring, and cover as described in paragraph 26.
Rack and Pinion Alinement
Occasionally following a severe shock, the altimeter may show an error of some magnitude, which may indicate
that the rack and pinion have jumped a tooth. Remove the cover, bezel ring, plastic window, pointer, and dial as described
in the appropriate paragraph above. Check the rack and pinion for punch marks. The punch mark on the rack will be
located between two teeth whereas the punch mark on the pinion will be on one tooth of the pinion. When in proper mesh,
the two marks must line up as shown in figure 12. If out of proper mesh, swing the vertical stop away from the rack, using
a small pliers. Holding the pointer shaft with one hand to prevent turning, gently raise the rack above the pinion and rotate
the pinion until the punch marks line up. Allow the rack to settle to its normal position and return the vertical stop back
over the rack. Replace the dial, pointer, plastic window, bezel ring, and cover as described in the appropriate paragraphs
Removal and Replacement of Mechanism
a. Remove the cover, bezel ring, plastic window, and pointer as described above.
b. Unscrew the three phillips head screws in the dial and lift the dial from the posts.