Is AD 97-33142 a recurring Airworthiness Directive?

No — AD 97-33142 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 97-33142

Q: Which aircraft does AD 97-33142 apply to?

AD 97-33142 applies to Teledyne Continental Motors, Rolls-Royce — models IO-360, LTSIO-360, TSIO-360, IO-520, LIO-520, LTSIO-520, TSIO-520. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 97-33142 · 1997-12-19 · reciprocating engine

Airworthiness Directives; Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, IO-520, LIO-520, TSIO-520, LTSIO-520 Series, and Rolls-Royce plc IO-360 and TSIO-360 Series Reciprocating Engines

What this AD requires

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.

Which aircraft AD 97-33142 applies to

MakesTeledyne Continental MotorsRolls-Royce

ModelsIO-360, LTSIO-360, TSIO-360, IO-520, LIO-520, LTSIO-520, TSIO-520

Serial-conditional — narrows to serials ?–901203H.

Applies to TCM IO-360/LTSIO-360/TSIO-360/IO-520/LIO-520/LTSIO-520/TSIO-520 engines built on or before Dec 31, 1980, or rebuilt engines with serial numbers lower than those listed in TCM Critical Service Bulletin CSB96-8, or factory-overhauled engines with serial number 901203H and lower; also Rolls-Royce plc IO-360 and TSIO-360 engines with any serial number.

Whether AD 97-33142 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 97-33142 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.