EASA AD US-2022-05-08
Engine - Strainer Assembly Screen - Inspection
Summary
The Federal Aviation Administration's Airworthiness Directive 2022-05-08 addresses certain General Electric Company CF34-10E model turbofan engines. It requires inspections and replacement of the stationary oil seal at the No. 1 forward bearing due to Teflon material contamination found in the A-sump oil strainer screen, which has caused in-flight shutdowns and unscheduled engine removals. This directive applies to engines with specific stationary oil seals installed or repaired after August 2014 and used with certain oil types.
What Changed
This new airworthiness directive introduces mandatory initial and repetitive visual inspections of the strainer assembly screen and requires replacement of the stationary oil seal as a terminating action. The applicability was refined to include only engines with stationary oil seals repaired or installed after August 2014 and exposed to high thermal stability or high performance capability oils for 56 flight hours or more. The directive also removed the previous requirement to perform inspections only at engine shop visits, allowing on-wing inspections.
Why It Matters
This directive is critical for aviation professionals to prevent engine failures caused by deteriorated stationary oil seals that release Teflon particles into the oil system. Operators and maintenance organizations must ensure compliance to avoid in-flight shutdowns and unscheduled engine removals, which can impact flight safety and operational reliability. Understanding the specific affected engine serial numbers and part numbers helps streamline maintenance planning and regulatory adherence.
What To Do
Operators must perform initial and repetitive visual inspections of the strainer assembly screen following the procedures in GE CF34-10E Service Bulletin 72-0365 R04 or earlier revisions. If contamination is found, the stationary oil seal, part number B1316-00453 or B1316-01274, must be replaced. Compliance with this directive is required by April 11, 2022, the effective date of the AD.
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