97-26-17
FR doc 97-33142 · 62 FR 66502AD 97-26-17Published 1997-12-19Effective 1998-01-23
Requires ultrasonic inspection for subsurface fatigue cracks in crankshafts installed in TCM IO-520 and TSIO-520 series engines and replacement of the crankshaft if a crack is found.
1 correction to this AD FAA · 1998-03-09
Correction published 1998-03-09
- Issued by
- Federal Aviation Administration
- Published
- 1998-03-09
- Document
- Federal Register 98-5798 · Final rule; correction
- Corrects
- the version published December 19, 1997 at 62 FR 66502
This document makes a correction to airworthiness directive (AD) 97-26-17 applicable to certain Teledyne Continental Motors (TCM) IO-520 and TSIO-520 engines that was published in the Federal Register on December 19, 1997 (62 FR 66502). The address information for the contact engineer in the For Further Information Contact section and the manufacturer's telephone number in the Addresses section and paragraph (f) of the Compliance Section is incorrect. This document corrects that information. In all other respects, the original document remains the same.
A correction restates part of an AD that was published incorrectly. It is not an additional requirement and it does not change the AD number or its effective date.
Source: Federal Register document 98-5798, retrieved 2026-08-15
Full official abstract
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Teledyne Continental Motors (TCM) IO-520 and TSIO-520 series reciprocating engines, that currently requires ultrasonic inspection for subsurface fatigue cracks in crankshafts installed in TCM IO-520 and TSIO-520 series engines and replacement of the crankshaft if a crack is found. This amendment adds a requirement to remove crankshafts manufactured using the airmelt process and replace them with crankshafts manufactured using the vacuum arc remelt (VAR) process, incorporates new ultrasonic inspection criteria in the AD, adds engine series TCM IO-360, TSIO-360, LTSIO-360, IO-520, LIO- 520, TSIO-520, LTSIO-520 and Rolls-Royce, plc IO-360 and TSIO-360 to the applicability, and revises the economic impact analysis. This amendment is prompted by reports of crankshaft failures due to subsurface fatigue cracking on engines that had been inspected in accordance with the current AD. The actions specified by this AD are intended to prevent crankshaft failure and subsequent engine failure.