AD 69-18-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | TSIO-520-B | CONTINENTAL Models TSIO-520-B, TSIO-520-D, and TSIO-520-E Engines |
| engine | Continental Motors | TSIO-520-D | CONTINENTAL Models TSIO-520-B, TSIO-520-D, and TSIO-520-E Engines |
| engine | Continental Motors | TSIO-520-E | CONTINENTAL Models TSIO-520-B, TSIO-520-D, and TSIO-520-E Engines |
Unsafe Condition
Failure of the turbocharger lubricating oil scavenge pump due to use of P/N 632597 scavenge pump drive gear and P/N MS 35756-3 Woodruff Key.
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Required Actions
Remove P/N 632597 scavenge pump drive gear and P/N MS 35756-3 Woodruff Key, replace with P/N 636251 scavenge pump drive gear and new P/N MS35756-3 Woodruff Key. Drill a .093 inch diameter hole to a depth of .31 inch in the floor of the gear cavity of the P/N 632602 scavenge body assembly.
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Compliance Time
within the next 100 hours' time-in-service after the effective date of this airworthiness directive, or at or before 400 hours' time-in-service on engines that have less than 300 hours' time-in-service at the effective date
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Affected Aircraft
Continental Motors TSIO-520-B (Serial Numbers 145001 through 145618), TSIO-520-D (Serial Numbers 156001 through 156103), and TSIO-520-E (Serial Numbers 165001 through 165493, 165496, and 165497) engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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