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FEDERAL AVIATION AGENCY Washington, D C 20553

Decanber 31, 1963

Honorable Alan S. Boyd Chairman

Civ11 Aeronautics Board Washington, D. c aches

Dear Mr Chairman:

Your letter to the Administrator of November 6, 1963, reference B-1-96, concerning a fatigue failure of the quill shaft that transmits power from the mix box to the aft transmiSSion of the Vertol Model 107 helicopter, has been referred to this office for reply. A failure of this quill shaft occurred in the accident at New York International Aégport on October 1h, 1963, involving New York Airways vertol 107,

N 73D.

As you pOinted cut in your letter, representatives of the Federal AViation Agency have been working closely with your prople during the investigation of this acCident As a result of the facts disclosed by the investigation, we prepared and issued an emergency airworthiness directive on November 1, 1963, which subsequently was published for general Circulation on November 25, 1963, as AD 63~2h-h. A copy of this airworthiness directive is enclosed. A copy of the emergency directive was mailed to Mr, Tanguay of your Bureau of Safety on November h, 1963 It is considered that the inspections and mandatory parts replacements specified by this airworthiness directive Wlll pre- clude a recurrence of the quill shaft failure that was involved in the aCCident.

With reference to your specific recommendations, the following comments are offered:

A. The transmissions and mix boxes of the Vertol lOT heli- copters operated by New Ybrk Airways were all overhauled prior to the resumption of operations There are no other Civil domestic operators of this helicopter