62-10-04 PRATT & WHITNEY: Amdt. 432 Part 507 Federal Register April 26, 1962. Applies to All JT4A Series Turbojet Engines.
Compliance required within the next 85 hours' time in service after the effective date of this directive and thereafter at periods not to exceed 85 hours' time in service from the last inspection.
Inspect third stage turbine rotor blades, P/N 405903, 411803, or 411903, for looseness or rattling in accordance with Pratt & Whitney Aircraft telegraphic message of November 15, 1961. If any blade looseness or rattling is found, remove the engine for blade replacement prior to further flight, except that an operator conducting more frequent periodic inspections than at the 85-hour intervals may delay replacement of loose blades for one additional 15-hour period of time in service provided that time in service since a known no loose blade condition will not exceed 85 hours.
Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator.
(Pratt & Whitney Aircraft telegraphic messages of November 15, 1961, and January 29, 1962, cover the same subject.)
This directive effective April 26, 1962.
(Revised June 14, 1962, for all persons except those to whom it was made effective immediately by individual telegrams dated May 14, 1962.)