AD 86-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | LTP 101-600A-1A | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTP 101-700A-1A | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-600A-2 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-600A-3 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650A-2 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650B-1 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650B-1A | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650C-2 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650C-3 | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
| engine | Honeywell International Inc. | LTS101-650C-3A | AVCO LYCOMING Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A Engines |
Unsafe Condition
Failure of a gas producer (G.P.) blade due to fatigue cracking from excessive vibratory stresses.
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Required Actions
Incorporate G.P. blade dampeners in accordance with Avco Lycoming Service Bulletin LT101-72-50-0079, Revision 1, dated April 21, 1986, or FAA approved equivalent.
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Compliance Time
on or before June 1, 1986, for engine models LTS101-600A-2, -600A-3, and -750C-1; and on or before September 30, 1986, for all other affected LT101 series engine models
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Affected Aircraft
Avco Lycoming Models LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, -750C-1; LTP101-600A-1A and -700A-1A engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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