# Proposed AD 98-ANE-27-AD: Textron Lycoming and Teledyne Continental Motors Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-17-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 11, 1998, 63 FR 25781
- Comments due: June 10, 1998
- Became: [AD 98-17-11](https://openairdocs.org/ad/98-17-11)
- Docket: 98-ANE-27-AD
- FR document: 98-12353
- Official PDF: https://openairdocs.org/files/sha256/ef/8a/ef8ac795484fb1605b6893e3602dc33a3b7609336489f594fdd47737399e4271 (from https://www.govinfo.gov/content/pkg/FR-1998-05-11/pdf/98-12353.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/05/11/98-12353/airworthiness-directives-textron-lycoming-and-teledyne-continental-motors-reciprocating-engines
- Page: https://openairdocs.org/proposed/98-ANE-27-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Textron Lycoming and Teledyne Continental Motors reciprocating engines that had crankshafts repaired by Nelson Balancing Service, Repair Station Certificate No. NB7R820J, Bedford, Massachusetts. This proposal would require removal from service of affected crankshafts, or a visual inspection, magnetic particle inspection, and dimensional check of the crankshaft journals, and, if necessary, rework or removal from service of affected crankshafts and replacement with serviceable parts. This proposal is prompted by reports of crankshafts exhibiting heat check cracking of the nitrided bearing surfaces which led to crankshaft cracking and subsequent failure. The actions specified by the proposed AD are intended to prevent crankshaft failure due to cracking, which could result in an inflight engine failure and possible forced landing.

## Notices in this docket

- May 11, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-12353, comments due Jun 10, 1998 (https://www.federalregister.gov/documents/1998/05/11/98-12353/airworthiness-directives-textron-lycoming-and-teledyne-continental-motors-reciprocating-engines)

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