AD 69-26-03

69-26-03 ALLISON: Amdt. 39-895. Applies to Model 250-C18 Series Engines. Compliance: Unless already accomplished, accomplish the following: (1) At next overhaul but no later than 750 hours' time in service since last overhaul or since new if never overhauled, modify the engine in accordance with Allison Commercial Engine Bulletins numbered 250CEB-57, - 58, -59, -61, -62, -63, -65, -66, -67, -68, -69, -70, -72, -73, -74, -75, -76, -77, -78, -79, -80, -81, -85, -86 and -89, or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region, except as specified in (2) below. (2) At next overhaul but no later than 1125 hours' time in service since last overhaul or since new if never overhauled, modify the power and accessories gear box in accordance with applicable portions of Allison Commercial Engine Bulletins specified in (1) above, or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA Central Region.(3) All engines must be modified in accordance with (1) and (2) above on or before October 1, 1971. This amendment becomes effective December 25, 1969.