AD Amdt-39-11422

final rule
Data completeness: 70%

Airworthiness Directives; General Electric Aircraft Engines CF34 Series Turbofan Engines

AD Number
Amdt-39-11422
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. 98-ANE-19-AD
FR Citation
64 FR 63171

Applicability

TypeManufacturerModelDetails
engine General Electric Aircraft Airworthiness Directives; General Electric Aircraft Engines CF34 Series Turbofan Engines

Unsafe Condition

The location of the reworked vent groove is ineffective, and the use of Buna-N O-rings may lead to uncommanded engine accelerations, potentially causing engine overspeed, uncontained engine failure, and damage to the airplane.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Replace Buna-N O-rings with Viton O-rings or reposition the vent groove on the MFC mounting flange. Alternatively, install an MFC with improved overspeed protection.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

General Electric Aircraft Engines CF34 series turbofan engines

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for General Electric Aircraft

Related Airworthiness Directives

2007-19-06

final rule

Airworthiness Directives; General Electric Company Aircraft Engine Group (GEAE) CF6-45A Series, CF6-50A, CF6-50C Series and CF6-50E Series Turbofan Engines

Unsafe Condition: The FAA is adopting a new airworthiness directive (AD) for GEAE CF6-45A, -45A2, -50A, -50C, -50CA, -50C1, -50C2, -50C2B, -50C2D, - 50C2F, -50C2R, -50E, -50E1, - 50E2, and -50E2B turbofan engines. T...

Effective: Oct 23, 2007 Category: aircraft

2007-05-16

final rule

Airworthiness Directives; General Electric Aircraft Engines (GE) CF34-3A1/-3B/-3B1 Turbofan Engines

Unsafe Condition: This action supersedes emergency airworthiness directive (AD) 2007-04-51 that was sent previously to all known U.S. owners and operators of GE CF34-3A1/-3B/-3B1 turbofan engines. That action requir...

Effective: Mar 12, 2007 Category: aircraft

2006-06-51 Recurring

final rule

Airworthiness Directives; General Electric Company Aircraft Engines (GEAE) CT7-8A Turboshaft Engines

Unsafe Condition: This document publishes in the Federal Register an amendment adopting emergency airworthiness directive (EAD) 2006-06-51 that we sent previously to all known U.S. owners and operators of GEAE CT7-8...

Effective: May 2, 2006 Category: aircraft

2004-07-09

final rule

Airworthiness Directives; General Electric Aircraft Engines CT7 Series Turboprop Engines

Unsafe Condition: could result in uncontained PGB failure and internal bulkhead damage, possibly prohibiting the auxiliary feathering system from fully feathering the propeller on certain PGBs.

Effective: May 11, 2004 Category: propeller

View all General Electric ADs →