68-08-08 LYCOMING: Amendment 39-584. Applies to VO, IVO-360 Series: VO, TVO-435 Series; IGSO-480 Series excluding models IGSO-480-A1D6, -A1E6, -A1G6; VO, IVO, TIVO-540 Series engines which incorporate the P/N 76289 hydraulic valve lifter.
Compliance required as indicated.
To prevent further valve failures replace hydraulic lifter P/N 76289 with P/N 78289 at the time in service specified below:
(a) TVO-435, VO-540, IVO-540, and TIVO-540 Series engines shall comply within 50 hours' time in service after the effective date of this AD.
(b) VO-360, VO-435, and IGSO-480 Series engines with less than 600 hours' time in service on P/N 76289 as of the effective date of this AD, shall comply prior to the accumulation of 650 hours' time in service on P/N 76289.
(c) VO-360, IVO-360, VO-345, and IGSO-480 Series engines with 600 or more hours' time in service on P/N 76289 as of the effective date of this AD shall comply within the next 50 hours' time in service.
(NOTE: Lycoming Service Bulletin No. 314A provides serial numbers of new and factory remanufactured engines which have the P/N 76289 hydraulic valve lifter.)
This amendment effective May 19, 1968.