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Thread: A.I. or c.m. type A.S.V.???

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    Default A.I. or c.m. type A.S.V.???

    Hi all

    In a 9 Group Standing Order concerning instructions on what pilots should do if they come down in neutral territory, such as Ireland, it states:

    "Aircraft equipped with A.I. or c.m. type A.S.V. or wired for c.m. type A.I. or A.S.V. or other c.m. radio equipment, even if the apparatus itself is not on board, are not to be landed on aerodromes in any circumstances, but are to be put down in open county and destroyed. Alternatively the crew are to bale out and the aircraft allowed to crash"

    What is/was/were "A.I. or c.m. type A.S.V."? Is someone able to explain these abbreviations to me in layman's terms, please?

    Thanks
    Steve
    41 (F) Squadron RAF at War and Peace, April 1916-March 1946
    http://brew.clients.ch/41sqnraf.htm

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    They are forms of airborne radar:

    ASV - Air to Surface Vessel, to find ships and subs
    AI - Airborne Interception, to find other aircraft

    CM would probably mean centrimetre frequency

    A

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    Hi Steve,

    A.I. is referring to Airborne Interception Radar, ie AI VIII on Mossie NF.XIII. Term still in use today AI 24 is the Foxhunter radar on the Tornado F.3

    c.m. ASV is referring to Air to Surface Vessel radars operating with wavelengths measured in cm or less. Wavelength is inversely proportional to frequency so the higher the operating frequency the smaller ("shorter") the wavelength.

    So basically saying don't let sophisticated radar equipment fall into third party hands (presumably in case it might finds its way to the enemy).

    Best Regards

    Andy Fletcher
    Last edited by Andy Fletcher; 19th July 2008 at 19:02. Reason: Typo
    Per Speculationem Impellor ad Intelligendum

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    Thanks Amrit and Andy

    Excellent, thanks! The answer was easier and more logical than I had initially thought. Thanks for your quick answers.

    Steve
    Last edited by Steve Brew; 20th July 2008 at 10:07. Reason: Typo
    41 (F) Squadron RAF at War and Peace, April 1916-March 1946
    http://brew.clients.ch/41sqnraf.htm

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