MIL-HDHK-162A
Volume 1
15 December 1965
Section 2
DATE: 1 September 1964
ITEM NAME: ELECTRONIC ALTIMETER SET
COGNIZANT SERVICE: USAF
TYPE: AN/APN-42A
FEDERAL STOCK NUMBER: 5841-978-0425
USA
USN
USAF
USMC
Tent. Std
STATUS OR TYPE CLASSIFICATION
Mfg(s) Name or Code Number. Sperry Gyroscope Company (56232)
determines the true altitude from the time delay between
FUNCTIONAL DESCRIPTION
the transmitted and reflected echo signal. As a result of
the altitude computation, a range computer generates
The AN/APN-42A Altimeter is a radar type altimeter that
altitude analog signals to drive a height indicator that
computes and displays true absolute aircraft altitude
visually displays the computer altitude.
above terrain. The altimeter transmits a pulsed RF
signal toward the terrain below. The reflected signal is
received by the altimeter and a range computer
AN/APN-42A: 1
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