Removal and Replacement of Lamps and Batteries
Replace defective lamps or exhausted batteries by unscrewing the appropriate cap in the case. Batteries should
be removed when altimeter is not in use.
Removal and Replacement of Cover, Bezel Ring, and Plastic Window
a. Remove the two screws and separate the cover from the case.
b. Unscrew the screws (9, fig. 2) and lift the bezel ring (8) from the case.
c. Remove the plastic window from the gasket and place the gasket back in its groove to prevent damage.
d. Replace the window, bezel ring, and cover in the reverse order; however, insert the window in the bezel ring
so that the vent tube fits the notch provided for it in the ring.
Removal and Replacement of Pointer
a. Remove the cover, bezel ring, and plastic window as described in paragraph 25.
b. Calibrate the altimeter, as described in paragraph 22, so that when reinstalling the pointer, it may be set at
the same scale reading as the known standard. This will compensate for any changes in atmospheric pressure while the
pointer is removed from the instrument.
c. Using a small screwdriver, loosen the clamping screw, then lift the pointer from the shaft (fig. 11.)