# AD 82-20-51: N2 Accessory Idler Gear Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and LTP 101-700A-1A
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4588B42A39F4B790862568420053108C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/82-20-51

## The airworthiness directive

82-20-51 AVCO LYCOMING: Telegram issued September 22, 1982. The following AD is issued and applicable to Avco Lycoming Model LTP101-600 and LTP101-600A turboprop engines (all serial numbers), Model LTP101-600A-1A turboprop engines prior to S/N 50095, and Model LTP101-700A-1A turboprop engines prior to S/N 51009. Within the next 25 hours time in service after receipt of this telegraphic AD unless already accomplished, remove the N2 accessory idler gear assembly in accordance with the accomplishment instructions contained in Avco Lycoming Service Bulletin Numbers LTP101A-72-0021 Rev. 1 and LTP101-72-0025 Rev. 1. This assembly is shown as Item 147 in Figure 2, Section 72-00-00, of Lycoming Maintenance Manual No. LTP101-2 and as Items 770, 750, 785, 775, 765, 760, and 755 in Figure 1, Section 72-60-00, of Lycoming Illustrated Parts Catalog Number LTP101-4. Replace with Avco Lycoming Kit P/N TLW-18823 in accordance with the accomplishment instructions contained in Avco Lycoming Service Bulletin Numbers LTP101A-72-0021 Rev. 1 and LTP101-72-0025 Rev. 1. The manufacturer's procedures identified and described in this directive are available upon request to Avco Lycoming, Williamsport, Pennsylvania. These documents may also be examined at FAA New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803. A historical file on this AD is maintained by the FAA at the New England Region Headquarters, Burlington, Massachusetts. This directive is effective immediately upon receipt of this telegram.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E7NE](https://openairdocs.org/tcds/E7NE): Intermountain Turbine Services Inc.; names 4 of 4 models: LTP 101-600A, LTP 101-600A-1A, LTP 101-600, 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: 2 (0 by airframe model, 2 by engine model)
- Makers: Air Tractor 1, Cessna 1

Models with the most aircraft:

- [Lycoming LTP-101-600](https://openairdocs.org/engine/lycoming-ltp-101-600): 1 aircraft (engine model)
- [Lycoming LTP101-600A](https://openairdocs.org/engine/lycoming-ltp101-600a): 1 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/82-20-51/models.md
Every aircraft: https://openairdocs.org/ad/82-20-51/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.