AD 82-20-51

final rule

AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines

AD Number
82-20-51
Status
final_rule
Effective Date
Product Category
engine
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
engine Honeywell International Inc. LTP 101-600 AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines
engine Honeywell International Inc. LTP 101-600A AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines
engine Honeywell International Inc. LTP 101-600A-1A AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines
engine Honeywell International Inc. LTP 101-700A-1A AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines

Unsafe Condition

Failure of the N2 accessory idler gear assembly could result in loss of engine power and subsequent forced landing.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Remove the N2 accessory idler gear assembly and replace it with Avco Lycoming Kit P/N TLW-18823 in accordance with Service Bulletins LTP101A-72-0021 Rev. 1 and LTP101-72-0025 Rev. 1.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Within the next 25 hours time in service after receipt of this telegraphic AD unless already accomplished

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Avco Lycoming Model LTP101-600 and LTP101-600A (all serial numbers), Model LTP101-600A-1A (prior to S/N 50095), and Model LTP101-700A-1A (prior to S/N 51009)

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

N2 Accessory Idler Gear Assembly

Applicability Source Text

Show captured applicability text from the source AD
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AD Number:
82-20-51
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines
Subject:
N2 Accessory Idler Gear Assembly
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Honeywell International Inc.
Model:
LTP 101-600 | LTP 101-600A | LTP 101-600A-1A | LTP 101-700A-1A
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 82-20-51
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   82-20-51

SUBJECT HEADING:   AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   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.

FOOTER:

Document Text

Show stored source text (verify against official source)
AD Final Rules - DRS_82-20-51.html
Copy URL
Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
82-20-51
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines
Subject:
N2 Accessory Idler Gear Assembly
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Honeywell International Inc.
Model:
LTP 101-600 | LTP 101-600A | LTP 101-600A-1A | LTP 101-700A-1A
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 82-20-51
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   82-20-51

SUBJECT HEADING:   AVCO LYCOMING Model LTP101-600 and LTP101-600A, LTP101-600A-1A, LTP101-700A-1A Engines

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   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.

FOOTER:

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

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