AD 87-26-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | TSIO-520-BE | TELEDYNE CONTINENTAL MOTORS (TCM) Model TSIO- 520BE and CE Engines |
| engine | Continental Motors | TSIO-520-CE | TELEDYNE CONTINENTAL MOTORS (TCM) Model TSIO- 520BE and CE Engines |
Unsafe Condition
Failure of the crankshaft and piston pins could occur due to improper thru-bolt torque or bearing shift, leading to engine failure.
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Required Actions
Conduct thru-bolt torque checks, replace piston pins, inspect crankshaft bearings, install placards for TSIO-520CE engines, and record compliance in logbooks. Engines must be removed from service if torque rotation force is outside 10-20 pounds, bearing shifts, or end play is absent.
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Compliance Time
Before further flight for TSIO-520BE engines and within the next 25 hours of operation for TSIO-520CE engines.
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Affected Aircraft
Teledyne Continental Motors (TCM) TSIO-520BE and CE engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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