EASA SIB 2007-07R1: FAA SAIB NE-07-23R1 - Thompson Engine-driven Fuel Pumps

What to do

Aircraft owners, operators, and maintenance organizations should inspect Thompson engine-driven fuel pumps, P/N TF-1900, within the next 100 hours time-in-service for specific labels or markings indicating unauthorized repair. If such markings are present, the fuel pump must be replaced and quarantined. If not, the drive shaft must be inspected for shape irregularities, with replacement required if a square-shaped shaft is found. Parts suppliers and distributors should also inspect their inventories accordingly.

Summary

FAA Special Airworthiness Information Bulletin NE-07-23R1 addresses safety concerns related to Thompson engine-driven fuel pumps, part number TF-1900, which were improperly maintained and approved for return to service by Thunderbird Aircraft Parts, Inc. This bulletin applies to Raytheon Aircraft Company Beech models 35 through 35R and various Teledyne Continental Motors engines including E225, E165, and E185 series. The document alerts aviation stakeholders to inspect these fuel pumps for specific markings indicating unauthorized repair and potential safety risks.

What changed

This revision updates the list of affected engine models and reinforces the inspection and replacement recommendations for Thompson engine-driven fuel pumps, P/N TF-1900. It highlights the identification of unapproved repairs by Thunderbird Aircraft Parts, Inc., and provides detailed inspection criteria for the fuel pump drive shaft and labeling. The bulletin also references prior Unapproved Parts Notification UPN No. 2004-00053 for compliance guidance.

Why it matters

This bulletin is critical for aviation professionals because the affected fuel pumps have been linked to engine stoppages and at least one accident due to drive gear shaft failures causing loss of fuel pressure. Ensuring these pumps are inspected and replaced if necessary helps maintain engine reliability and flight safety. Maintenance organizations, operators, and parts suppliers must be vigilant to avoid using potentially unsafe components that could compromise aircraft operation.