AD 97-26-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | IO-360-A | 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 |
| engine | Continental Motors | IO-360-AB | 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 |
| engine | Continental Motors | IO-360-B | 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 |
| engine | Continental Motors | IO-360-C | 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 |
| engine | Continental Motors | IO-360-D | 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 |
| engine | Continental Motors | IO-360-DB | 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 |
| engine | Continental Motors | IO-360-E | 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 |
| engine | Continental Motors | IO-360-ES | 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 |
| engine | Continental Motors | IO-360-G | 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 |
| engine | Continental Motors | IO-360-GB | 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 |
Unsafe Condition
Crankshaft failure and subsequent engine failure due to crankshafts manufactured using the airmelt process or unknown manufacturing process.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
At the next engine overhaul or crankshaft removal, determine if the crankshaft was manufactured using the airmelt or VAR process. Replace airmelt crankshafts with VAR ones. Conduct ultrasonic inspections on VAR crankshafts before installation, performed by qualified inspectors. Submit alternative compliance requests through FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next engine overhaul, or whenever the crankshaft is next removed from the engine, after the effective date of this AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Teledyne Continental Motors and Rolls-Royce plc IO-360, TSIO-360, LTSIO-360, IO-520, LIO-520, LTSIO-520, and TSIO-520 series engines built on or before December 31, 1980; rebuilt engines with serial numbers lower than CSB96-8; factory overhauled engines with serial number 901203H or lower; and Rolls-Royce engines of any serial number.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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