# AD 86-10-04: Gas Producer (G.P.) Blade

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2, LTS101-600A-3, LTS101-650A-2, LTS101-650B-1, LTS101-650B-1A, LTS101-650C-2, LTS101-650C-3, LTS101-650C-3A, LTS101-750A-1, LTS101-750A-3 and 2 more
- Effective: May 16, 1986
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-5299
- Registered aircraft: 35 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/66257794EFE6B19786256842005B4390.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/86-10-04

## The airworthiness directive

86-10-04 AVCO LYCOMING: Amendment 39-5299. Applies to Avco Lycoming Model LTS101-600A-2, -600A-3, -650A-2, -650B-1, -650B-1A, -650C-2, -650C-3, -650C-3A, -750A-1, -750A-3, -750B-2, and -750C-1 turboshaft; and LTP101-600A-1A, and -700A-1A turboprop engines. Compliance is required 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, unless already accomplished. To prevent the failure of a gas producer (G.P.) blade due to fatigue cracking from excessive vibratory stresses, incorporate G.P. blade dampeners in accordance with Avco Lycoming Service Bulletin (SB) Number LT101-72-50-0079, Revision 1, dated April 21, 1986, or FAA approved equivalent. Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the AD can be accomplished. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Engine Certification Office, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803. Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Engine Certification Office, New England Region, may adjust the compliance dates specified in this AD. Avco Lycoming SB Number LT101-72-50-0079, Revision 1, dated April 21, 1986, identified and described in this document, 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 this document from the manufacturer may obtain copies upon request to Avco Lycoming Williamsport Division, 652 Oliver Street, Williamsport, Pennsylvania 17701, Attention: Customer Support. This document also may be examined at the Office of the Regional Counsel, Rules Docket Number 86- ANE-14, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday except Federal holidays. This amendment becomes effective on May 16, 1986.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E5NE](https://openairdocs.org/tcds/E5NE): Intermountain Turbine Services Inc.; names 9 of 13 models: LTS101-600A-3, LTS101-750C-1, LTS101-650C-3A, LTS101-600A-2, LTS101-650C-3, LTS101-750B-2, LTS101-650B-1, LTS101-650B-1A…
- [TCDS E7NE](https://openairdocs.org/tcds/E7NE): Intermountain Turbine Services Inc.; names 2 of 4 models: LTP 101-600A-1A, LTP 101-700A-1A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 35 (0 by airframe model, 35 by engine model)
- Makers: Bell 15, Messerschmitt-Bolkow-Blohm 9, MBB 3, Messerschmitt 3, Aerospatiale 2, Eurocopter Deutschland 2, S N I A S 1

Models with the most aircraft:

- [Lycoming LTS-101 series](https://openairdocs.org/engine/lycoming-lts-101-series): 29 aircraft (engine model)
- [Lycoming LTS-101 600A series](https://openairdocs.org/engine/lycoming-lts-101-600a-series): 3 aircraft (engine model)
- [Honeywell LTS101-650C-3](https://openairdocs.org/engine/honeywell-lts101-650c-3): 2 aircraft (engine model)
- [Honeywell LTS101-750C-1](https://openairdocs.org/engine/honeywell-lts101-750c-1): 1 aircraft (engine model)

All 4 models: https://openairdocs.org/ad/86-10-04/models.md
Every aircraft: https://openairdocs.org/ad/86-10-04/aircraft.md

Its text cites no advisory circulars or STCs.

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