66-14-03 LYCOMING: Amdt. 39-248, Part 39, Federal Register June 8, 1966. Applies to Model O-540- B2B5 Engines, Serial Numbers 101-40 through 8267-40, Installed in Piper PA-25 and Intermountain Manufacturing Company Airplanes, Except Engines Remanufactured at Lycoming after November 14, 1965.
Compliance required as indicated, unless already accomplished.
To prevent further failures of crankshaft idler shafts, accomplish the following:
(a) For engines with less than 300 hours' time in service on the effective date of this AD since overhaul, comply with (d) before the accumulation of 400 hours' time in service since overhaul.
(b) For engines with less than 300 hours' time in service on the effective date of this AD since new that have never been overhauled, comply with (d) before the accumulation of 400 hours' time in service since new.
(c) For engines with 300 or more hours' time in service on the effective date of this AD since new or overhaul, comply with (d) within the next 100 hours' time in service.
(d) Replace crankshaft idler shaft, P/N 70390, and accessory housing, P/N 71648, with crankshaft idler shaft, P/N 73014, and accessory housing, P/N 75367 or 71648-85.
(Lycoming Service Bulletin No. 308 pertains to this subject.)
This directive effective July 9, 1966.