AD 78-12-09

78-12-09 AVCO LYCOMING: Amendment 39-3238 as amended by Amendment 39-3414. Applies to O-320-H series engines with the following serial numbers, unless already accomplished.

L-103-76, L-104-76, L-272-76, L-283-76, L-288-76, L-290-76, L-336-76, L-337-76, L-341-76, L-404-76, L-431-76, L-468-76, L-469-76, L-471-76, L-494-76, L-548-76, L-589-76, L-590-76, L-592-76, L-650-76, L-684-76, L-689-76, L-698-76, L-736-76, L-737-76, L-738-76, L-743-76, L-754-76, L-763-76, L-768-76, L-769-76, L-772-76, L-774-76, L-777-76, L-778-76, L-802-76, L-824-76, L-834-76, L-846-76, L-903-76, L-904-76, L-929-76, L-940-76, L-945-76, L-948-76, L-949-76, L-1054-76, L-1115-76, L-1119-76, L-1122- 76 THROUGH L-1129-76, L-1131-76 THROUGH L-1134-76, L-1144-76, L-1156-76, L-1181-76, L-1186- 76, L-1191-76, L-1200-76, L-1205-76, L-1207-76, L-1237-76, L-1255-76, L-1304-76, L-1305-76, L-1352-76, L-1354-76, L-1374-76, L-1375-76, L-1379-76, L-1460-76, L-1476-76, L-1489-76, L-1492-76, L-1513-76, L-1568-76, L-1577-76, L-1626-76, L-1630-76, L-1639-76, L-1644-76, L-1657-76, L-1658-76, L-1665-76, L-1668-76, L-1678-76, L-1679-76, L-1687-76, L-1693-76, L-1694-76, L-1697-76, L-1795-76, L-1796-76, L-1824-76, L-1825-76, L-1826-76, L-1870-76, L-1885-76, L-1934-76, L-2002-76, L-2007-76, L-2016-76, L-2025-76 THROUGH L-2032-76, L-2041-76, L-2047-76, L-2065-76 THROUGH L-2068-76, L-2071-76 THROUGH L-2077-76, L-2115-76, L-2148-76, L-2157-76, L-2159-76 THROUGH L-2163-76, L-2165-76, L-2167-76, L-2168-76, L-2171-76, L-2174-76 THROUGH L-2182-76, L-2189-76, L-2190-76, L-2191-76, L-2192-76, L-2198-76, L-2260-76, L-2293-76, L-2294-76, L-2308-76, L-2338-76, L-2339-76, L-2340-76, L-2343-76, L-2344-76, L-2350-76, L-2365-76, L-2556-76, L-2596-76, L-2635-76, L-2636-76, L-2637-76, L-2644-76, L-2666-76, L-2697-76, L-2728-76, L-2731-76, L-2758-76, L-2762-76, L-2763-76, L-2774-76, L-2777-76, L-2782-76, L-2784-76, L-2790-76, L-2816-76, L-2832-76, L-2837-76, L-2842-76, L-2843-76, L-2845-76, L-2857-76, L-2908-76, L-2914-76, L-2921-76, L-2922-76, L-2924-76, L-2930-76, L-2932-76 THROUGH L-2938-76, L-2942-76, L-2947-76, L-2948-76, L-2962-76, L-2963-76, L-2966-76, L-2975-76, L-2980-76, L-2985-76, L-2987-76, L-2988-76, L-2989-76, L-2992-76, L-2999-76, L-3004-76, L-3010-76, L-3016-76, L-3034-76, L-3035-76, L-3041-76, L-3047-76, L-3063-76, L-3067-76, L-3068-76, L-3155-76, L-3170-76, L-3172-76, L-3240-76, L-3262-76, L-3288-76, L-3289-76, L-3291-76, L-3292-76, L-3293-76, L-3295-76, L-3296-76, L-3308-76, L-3313-76, L-3319-76, L-3384-76, L-3395-76 THROUGH L-3400-76, L-3402-76, L-3403-76, L-3404-76, L-3406-76, L-3411-76, L-3412-76, L-3413-76, L-3414-76, L-3428-76, L-3467-76, L-3551-76, RL-114-76, RL-124-76, RL-133-76, RL-162-76, RL-176-76, RL-186-76, RL-205-76, RL-249-76, RL-254-76, RL-328-76, RL-332-76, RL-351-76, RL-367-76, RL-384-76, RL-408-76, RL-416-76, RL- 418-76, RL-419-76, RL-435-76, RL-442-76, RL-443-76, RL-477-76, RL-510-76, RL-543-76, RL-550-76, RL-612-76, RL-652-76, RL-673-76, RL-695-76, RL-832-76, RL-1022-76, RL-1082-76, RL-1173-76, RL-1218-76, RL-214-76.

Compliance required before further flight except that the aircraft may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. a. To prevent possible crankshaft gear failure, remove and replace the crankshaft assembly and install crankshaft assembly P/N LW-15917 in accordance with AVCO Lycoming Service Bulletin No. 422, dated March 24, 1978, or FAA approved equivalent. b. Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Amendment 39-3238 was effective June 20, 1978. This Amendment 39-3414 is effective February 20, 1979.