AD Amdt-39-10915

final rule
Data completeness: 70%

Airworthiness Directives; Allison Engine Company 250-B and 250-C Series Turboshaft and Turboprop Engines

AD Number
Amdt-39-10915
Status
final_rule
Effective Date
Product Category
engine
Docket
Docket No. 98-ANE-23-AD
FR Citation
63 FR 66735

Applicability

TypeManufacturerModelDetails
aircraft Bell Various Airworthiness Directives; Allison Engine Company 250-B and 250-C Series Turboshaft and Turboprop Engines
engine Allison Engine Company 250-B and 250-C Series Airworthiness Directives; Allison Engine Company 250-B and 250-C Series Turboshaft and Turboprop Engines

Unsafe Condition

This amendment adopts a new airworthiness directive (AD), applicable to certain Allison Engine Company 250-B and 250-C series turboshaft and turboprop engines, that requires replacing existing beryllium copper main fuel control (MFC) bellows assemblies with Inconel 718 stainless steel welded MFC bellows assemblies. This amendment is prompted by reports of leaking MFC bellows assemblies resulting in an uncommanded minimum fuel flow condition, loss of engine fuel flow control and subsequent for...

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

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