In 1948, the 3200th Proof Test Group at Eglin AFB, Florida, fitted the 4th F-82B Twin Mustang ( " 44-65163 " ) with retractable pylons under the outer wings capable of mounting 10 High-Velocity Air Rockets ( HVAR ) each, which folded into the wing undersurface when not in use.
42.
On 7 November 1948, the second prototype of the Republic Republic XR-12-RE Rainbow reconnaissance design, " 44-91003 ", crashed at 1300 hrs . while returning to Eglin from a photographic suitability test flight on its second test flight at the base by the Photo Test Squadron of the 3200th Proof Test Group.
43.
The Comet's pressure cabin had been designed to a safety factor comfortably in excess of that required by British Civil Airworthiness Requirements ( 2.5 times the cabin proof test pressure as opposed to the requirement of 1.33 times and an ultimate load of 2.0 times the cabin pressure ) and the accident caused a revision in the estimates of the safe loading strength requirements of airliner pressure cabins.
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