AD 2006-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S.A. CFM56 Series Turbofan Engines |
Unsafe Condition
Failed fuel filters manufactured under parts manufacturer approvals (PMA), specifically Western Filter part numbers WF337661 and WF337017, and PTI Technologies part numbers 7595983-101 and 7588133, can allow unfiltered fuel contamination in fuel components, including fuel nozzles, leading to the loss of engine thrust.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace fuel filters with part numbers WF337661, WF337017, 7595983-101, or 7588133 with filters not listed in this AD. For CFM56-7B engines, this must be done within 600 flight hours or 60 days after the effective date, whichever comes first. For CFM56-2, -3, and -5 series engines, this must be done at the next filter change or 4,000 flight hours after the effective date, whichever comes first. Do not install any of the specified filters after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 600 flight hours or 60 days for CFM56-7B engines; at the next filter change or 4,000 flight hours for CFM56-2, -3, and -5 series engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CFM International CFM56-2 series, -3 series, -5 series, and -7B series engines with fuel filters part numbers WF337661, WF337017, 7595983-101, or 7588133 installed. These engines are installed on, but not limited to, Airbus A320 and A340 series airplanes, Boeing DC8-71, -72, and -73 series airplanes, and Boeing 737 series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.