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#1
11th February 2021, 18:09
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Meaning of abbreviation 'S.I.'
I'm looking at the ORB of No. 221 Squadron for 1942 (Wellngton anti-shipping ops from Egypt) and I've come across 'S.I. badly jammed'.
This seems to be referring to ASV radar but what does it stand for: search indicator, search instrument, special item or … ? 
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#2
11th February 2021, 18:19
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Re: Meaning of abbreviation 'S.I.'
Special Instrument?
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#3
11th February 2021, 18:37
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Re: Meaning of abbreviation 'S.I.'
Quote:
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#4
11th February 2021, 19:16
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Re: Meaning of abbreviation 'S.I.'
Could also be Special Installation
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#5
12th February 2021, 18:43
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Re: Meaning of abbreviation 'S.I.'
Hello, Nick
I, too, am researching Wellingtons in the ME, and have, courtesy of TNA, many of the relevant ORB’s. I put in a request for the same query a while back and the general consensus was that it stood for Special Installation. Regards Andy B
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#6
12th February 2021, 21:39
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Re: Meaning of abbreviation 'S.I.'
Thanks Andy. One day, I guess one of us will find a source that spells it out in full — but probably only if we are looking for something else.
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#7
15th February 2021, 23:27
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Re: Meaning of abbreviation 'S.I.'
I found this in a Middle East operational Research report. It refers both to S.I. and Special Interference but as I read it, they are two different things (i.e. the radar itself and the effects of jamming).
Also, a title that I've just found in the TNA catalogue: AVIA 19/198 "Guard for special installation aerials".
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