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JAN 13, 1964 In Reply Refer to: ES-100

Mr. Leon H. Tanguay Director, Bureau of Safety Civil Aeronautics Board Washington, D. C. 20128

Dear Mr. Tanguay:

This supplements our July 30, 1963, reply to Mr. Boyd's letter dated June 14, 1963, reference B-1-96, concerning brake failures of Curtiss propellers on Lockheed 1049G aircraft.

This is to advise that on November 25, 1963, Airworthiness Directive No. 63-24-1 was issued requiring replacement of brake cages within 100 hours' time in service after the effective date of the airworthiness directive. A copy of FAA Airworthiness Directive Issue No. 63-24 is enclosed for your information. Mr. Frank Taylor of your Engineering Division was notified by telephone of this airworthiness directive immediately following its issuance.

As indicated in our July 30, 1963, letter, we believe that closer surveillance of the threaded type brake cage units and replacement of the threaded units with bolted configurations will preclude the possibility of further Curtiss propeller brake failures.

Sincerely yours,

/s/C Schuck

George S. Moore Director Flight Standards Service

Enclosure Attachment A (page 6 of 6)