78-12-09: Crankshaft Gear Assembly
FAA order 78-12-09 is an airworthiness directive in force since February 20, 1979. The FAA's subject line: Crankshaft Gear Assembly. It names the Lycoming O-320-H2AD, Lycoming O-320 series engines: about 27,394 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Engine
- Makes
- Lycoming Engines
- Models
- O-320-H1AD, O-320-H1BD, O-320-H2AD, O-320-H2BD, O-320-H3AD, O-320-H3BD
- Engine series
- Lycoming O-320-H2AD 83 aircraft
Lycoming O-320 series 27,311 aircraft
Dates and paperwork
- In force since
- February 20, 1979
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (3,680 characters)
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.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 30, 2026. Connections as data: /graph/directive/78-12-09.json · aircraft systems.