EASA SIB AV-2009-01: Pratt & Whitney Canada PT6A Engines - Handling of External Tubes and Fittings

What to do

Operators, aircraft maintenance engineers, and repair facilities should review and comply with Pratt & Whitney's Service Information Letter Gen. PT6A-026 and the engine maintenance manual's standard practices. Careful alignment and loosening of rigid tubes at both ends before installation are essential to prevent tube distortion. Any defects or malfunctions should be reported to Transport Canada Continuing Airworthiness as per CAR 591 requirements.

Summary

Transport Canada Civil Aviation Service Difficulty Advisory No. AV-2009-01 addresses handling issues related to Pratt & Whitney Canada PT6A engines, specifically focusing on external fuel by-pass tubes and fittings, part number 3011849. The advisory highlights reports of cracking in these tubes that can lead to fuel leaks, engine compressor ingestion, and cabin contamination. It reminds maintenance personnel to follow proper procedures to avoid damage during handling and installation.

What changed

This advisory introduces a non-mandatory notification emphasizing the correct handling and alignment of external tubes and fittings on PT6A engines to prevent cracking and fuel leaks. It references Pratt & Whitney's Service Information Letter Gen. PT6A-026 and maintenance manual chapter 70 for detailed guidance. The advisory does not issue an airworthiness directive but serves as a caution to operators and maintenance providers.

Why it matters

Proper handling of PT6A engine external tubes is critical to prevent fuel leaks that can compromise engine performance and cabin safety. Aviation professionals, including operators and maintenance organizations, must be aware of the risks of tube damage during maintenance to avoid costly repairs and potential safety hazards. Adhering to recommended procedures helps maintain engine reliability and airworthiness.