Operating Instructions for AN/APN-1/A Aircraft Radio Altimeter 1943 A-6 1000 lb bomb set at

1000 lb bomb set at No 8

The fifth section

A rare item indeed

see logo with the 3-crown symbol of Sweden on the inside flap

for a dual engine aircraft

Operating Instructions for AN/APN-1/A Aircraft Radio Altimeter 1943 A-6 1000 lb bomb set atThis is an original WWII era manual, Handbook of Operating Instructions for AN APN 1 and AN APN 1A Aircraft Radio Altimeter system, dated June 1943. The Radio Altimeter was used in a number of aircraft of the US Army Air Force and US Navy where close monitoring of height over terrain was critical, such as torpedo bomber TBM Avenger (see image from TBM Flight Manual), dive bomber SB2C Helldiver, patrol aircraft PV 1 Ventura, PV 2 Harpoon, PBY Catalina,