SUBJECT: ALTERNATE AIR CABLE CHAFE INSPECTION AND MODIFICATION
MODELS AFFECTED: PA-44-180 Seminole equipped with Fuel Injected Engines
SERIAL NUMBERS AFFECTED: 4496404 thru 4496649
COMPLIANCE TIME: To coincide with the next regularly scheduled maintenance event, but not to exceed the next 100 hours time in service (TIS).
APPROVAL: The content of this service document has been reviewed and determined to be in accordance with applicable Federal Aviation Regulations.
PURPOSE: In some affected aircraft equipped with fuel injected engines, the LH engine alternate air cable attach clamp may have rotated, allowing for the cable to chafe against the engine mount tube, leading to a certain loss of material from the engine mount tube over time. This service bulletin mandates a one-time inspection, and on condition, repair or replacement of the engine mount. In addition, this document mandates a one-time modification of the alternate air cable installation to reduce chafing damage, regardless of whether the engine mount was repaired or replaced.
EFFECTIVITY DATE: This service bulletin is effective on October 27, 2026.
SUMMARY: Applicable factory participation is limited to new aircraft in warranty at the time of compliance. Factory participation will remain in effect for a period of time not to exceed 180 days from the effectivity date of this service bulletin. Please contact your Piper Approved Service Center to make arrangements for compliance with this service bulletin in accordance with the compliance time indicated.
NOTE: Please notify the factory of any address/ownership corrections. Changes should include aircraft model, serial number, and current owner’s name and address.
Corrections and/or changes should be directed to:
