CPU-66/A SUBSONIC ALTITUDE COM-
PUTER. --The CPU-66/A altitude computer
(fig. 6-23) is used to altitudes of 50,000 feet and
at speeds up to 0.95 Mach. Its operation is similar
to that of the CPU-46/A.
The ADCs have been modified to have the
same altitude output capabilities as the CPU-46/A
or the CPU-66/A. The modification depends on
the speed and altitude capabilities of the aircraft
in which the unit is installed.
Altimetry
The three altimeters that work with the
automatic altitude reporting system are the
AAU-19/A, AAU-21/A, and AAU-24/A (fig.
SERVOED BAROMETER ALTIMETER
AAU-19/A. --The counter-drum-pointer servoed
barometric altimeter (fig. 6-25) consists of a
Figure 6-23.-CPU-66/A subsonic altitude computer.
pressure altimeter combined with an at-powered
servomechanism. The altitude display is in digital
form, using a 10,000-foot counter, a 1,000-foot
counter, and a 100-foot drum. Also, a single
Figure 6-24.-AAU-19/A, AAU-21/A, AAU-24/A altimeters.
6-22
