Sperry ball turret manual?

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This is a section taken out of NAVAER 00-80S-40 dated 1944, as pertains to the PB4Y-1, Navalized Liberator.
 

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Which type was used on a B-17G?

Sperry A-2 series on the B-17, A-13 series on the B-24.

Both are identical from the top of the hangar cradle downwards, the only difference being the support rod; fixed on the B-17, hydraulically retractable on the B-24.

The AAF manual for these is AN 11-45G-1 Handbook of Instructions for Lower Ball Turrets Types A-2, A-2A, and A-13, I've not found the number for the parts catalog as yet.

All the best,
PB
 
Whilst you're waiting for a reply Roman, is this pic any use? Taken at Duxford, the turret removed from 'Mary Alice', as she undergoes deep maintenance.
 

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