WWII 1943 USAAF AN/APN-1 APN-1A APN-1B Aircraft Radio Altimeter Manual

Original-looking World War II U.S. Army Air Forces technical manual dated November 1, 1943, titled Handbook of Operating Instructions for AN/APN-1, AN/APN-1A and AN/APN-1B Aircraft Radio Altimeter Equipments.

This wartime publication provides operating instructions for early aircraft radio altimeter systems used to determine an aircraft’s altitude above the terrain.

The manual features the original RESTRICTED – FOR OFFICIAL USE ONLY designation and includes security notices for both American and British military personnel.

An interesting surviving example of WWII aviation electronics documentation covering early airborne radar and radio navigation technology.

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