73-15-04 AVCO LYCOMING: Amdt. 39-1689. Applies to HIO-360-D1A model engines installed on Hughes Models 269C and 300C helicopters.
Compliance required within 300 hours time in service after the effective date of this AD and every 300 hours in service thereafter.
To prevent possible failures of the Bendix part numbers 10-349235-3 and 10-349235-4 magnetos, replace the part number 10-391315 rubber drive plate grommet in accordance with Lycoming Service Bulletin No. 364 or equivalent procedure approved by Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This amendment is effective July 23, 1973.