Originally Posted by
megan
The 61 must be unique in that regard, are you familiar as to why JD, besides it obviously being the best place found?
(I signed on in June 1966). Here is what I recall being told. The original 61 was the USN anti-sub SH-3A model with cockpit roof mounted pitots. That location was also used for USAF model with the rear ramp. The USAF required that model be FAA certified and it was. The head mounted probes on the commercial model 61s resulted from the associated flight profiles commensurate with Cat A certification, which the previous military testing and the FAA certification of the USAF model did not include.