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Airworthiness Directive

AD 2011-25-51 76 FR 77382 Active

Federal Aviation Administration · 14 CFR part 39

Requires replacing affected CMI starter adapters with starter adapters eligible for installation.

Federal Register (opens in a new tab)

FR document
2011-31794
Amendment
39-16891
Published
2011-12-13
Effective
2011-12-28
Models covered
2

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/2011-25-51 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

2011-25-51

FR doc 2011-31794 · 76 FR 77382

AD 2011-25-51Published 2011-12-13Effective 2011-12-28

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires replacing affected CMI starter adapters with starter adapters eligible for installation.

Full official abstract

We are adopting a new airworthiness directive (AD) for certain Continental Motors, Inc. (CMI) models TSIO-520, TSIO-550-K, TSIOF-550K, and IO-550-N series reciprocating engines. This emergency AD was sent previously to all known U.S. owners and operators of these engines. This AD requires replacing affected CMI starter adapters with starter adapters eligible for installation. This AD was prompted by 5 reports received of fractures in starter adapter shaft gears in certain part number (P/N) CMI starter adapters. We are issuing this AD to prevent failure of the starter adapter gear shaft, leading to an inoperable oil scavenge pump and engine in-flight shutdown.

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All Continental IO-520 directives

View on Federal Register (opens in a new tab) Search DRS manually for AD 2011-25-51 (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 2 models in our index