- Effective
- March 30, 1978
- Published
- March 30, 1978
- Issued
- March 30, 1978
- Models
- T53-L-703, T5307A, T5309A, T5309B, T5309C, T5311A and 4 more
- Registered aircraft
- 150 matched by model
- Product
- Engine
- Amendment
- 39-3165
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed November 21, 2025.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 26 KB | bc4da0f7…95c6d69 | FAA DRS (API key needed) |
On this page
The airworthiness directive
77-17-08 AVCO LYCOMING: Amendment 39-3019 as amended by Amendment 39-3165. Applies to all Avco Lycoming T53 series engines.
Compliance for P/Ns 1-170-240-52, 1-170-240-58, and 1-170-240-59 is required by September 15, 1977.
Compliance for remaining part numbers listed below is required by May 1, 1978.
To preclude possible failure of the fuel regulator P1 multiplier lever resulting in flameout of the engine, perform the following in accordance with Avco Lycoming Service Bulletin No. 0048, Revision 1, dated March 15, 1978, or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region:
1. Fill the fuel regulator P1 multiplier cavity with silicone oil, General Electric P/N SF96-100, or equivalent.
2. Reidentify the fuel regulator, from P/N 1-170-240-52 to P/N 1-170-240-61, or from P/N 1-170-240-58 to P/N 1-170-240-60, or from P/N 1-170-240-59 to P/N 1-170-240-62.
From P/N To P/N
1-160-840-01 1-160-840-15 1-160-840-02 1-160-840-14 1-160-840-03 1-160-840-13 1-160-840-09 1-160-840-11 1-160-840-10 1-160-840-12
1-160-950-02 1-160-950-16 1-160-950-04 1-160-950-15 1-160-950-05 1-160-950-17 1-160-950-06 1-160-950-18 1-160-950-08 1-160-950-19 1-160-950-10 1-160-950-13 1-160-950-12 1-160-950-14
1-170-240-01 1-170-240-68 1-170-240-03 1-170-240-69 1-170-240-04 1-170-240-70 1-170-240-05 1-170-240-71 1-170-240-06 1-170-240-72 1-170-240-08 1-170-240-73 1-170-240-09 1-170-240-74 1-170-240-12 1-170-240-75 1-170-240-17 1-170-240-76 1-170-240-19 1-170-240-77 1-170-240-20 1-170-240-78 1-170-240-21 1-170-240-64 1-170-240-25 1-170-240-79 1-170-240-26 1-170-240-80 1-170-240-27 1-170-240-81 1-170-240-30 1-170-240-82 1-170-240-45 1-170-240-63 1-170-240-46 1-170-240-83 1-170-240-47 1-170-240-84 1-170-240-48 1-170-240-67 1-170-240-49 1-170-240-65 1-170-240-57 1-170-240-66
The manufacturer's Service Bulletin identified and described in this directive is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Avco Lycoming Division, 550 South Main Street, Stratford, Connecticut 06497. These documents may also be examined at Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and at FAA Headquarters, 800 Independence Avenue S.W., Washington, D.C.
A historical file on this A.D. which includes the incorporated material in full is maintained by the FAA at its Headquarters in Washington, D.C., and at New England Region.
Amendment 39-3019 became effective August 31, 1977.
This amendment 39-3165 becomes effective March 30, 1978.
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 150
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1944 | 1 |
|---|---|
| 1960 | 1 |
| 1961 | 2 |
| 1962 | 12 |
| 1963 | 7 |
| 1964 | 12 |
| 1965 | 10 |
| 1966 | 11 |
| 1967 | 8 |
| 1968 | 11 |
| 1969 | 6 |
| 1970 | 5 |
| 1971 | 5 |
| 1972 | 3 |
| 1973 | 5 |
| 1974 | 4 |
| 1975 | 5 |
| 1976 | 6 |
| 1977 | 3 |
| 1978 | 1 |
| 1979 | 3 |
| 1980 | 1 |
| 1982 | 1 |
| 1988 | 1 |
| 1994 | 1 |
| 1995 | 1 |
| 1996 | 1 |
| 1997 | 1 |
| 1999 | 1 |
| 2003 | 1 |
| 2004 | 1 |
| 2012 | 1 |
18 with no year recorded