63-14-03 LYCOMING: Amdt. 583 Part 507 Federal Register July 6, 1963. Applies to O-540 Series Engines with Serial Numbers 101-40 Through 6129-40 and IO-540 Series Engines with Serial Numbers 101-48 Through 551-48 Which Do Not Incorporate Oil Pump Drive Shaft P/N's 67512 (Redesigned) or 74641.
Compliance required as indicated.
(a) For Model O-540 Series engines Serial Numbers 101-40 through 5264-40 and IO-540 Series engines, Serial Numbers 101-48 through 423-48, compliance with (c) required within 25 hours' time in service after the effective date of this AD and every 100 hours' time in service thereafter.
(b) For Model O-540 Series engines, Serial Numbers 5265-40 through 6129-40 and IO-540 Series engines, Serial Numbers 424-48 through 551-48, compliance with (c) required as follows:
(1) Within 25 hours' time in service after the effective date of this AD and every 100 hours' time in service thereafter for engines with more than 275 hours' time in service on the effective date of this AD.
(2) Prior to the accumulation of 300 hours total time in service and every 100 hours' time in service thereafter for engines with 275 hours' or less time in service on the effective date of this AD.
(c) Inspect the oil pump drive shaft (P/N 67512) on applicable engines in accordance with instructions contained in Lycoming Service Bulletin No. 295. Any shafts which are found to be damaged shall be replaced before further flight. These inspections shall be continued until Lycoming P/N 67512 (redesigned) or P/N 74641 oil pump drive shaft is installed at which time the inspections may be discontinued.
NOTE: All remanufactured engines shipped from Lycoming after April 1, 1963, have the new shaft installed.
This directive effective July 6, 1963.