Category Archives: PT6A Engine

What is a Hot Section Inspection & Why It’s Important to PT6A Engine Longevity

The Pratt & Whitney PT6 engine has been in use since 1961 and has since logged more than 380 million flight hours, the equivalent of about 250,000 round-trips to the moon.   The most advanced PT6A engine family includes three power levels, “Small”, “Medium”, and “Large” that all have the advantage of turbine cooling, aerodynamic design, and advanced technologies in materials.  Keeping these engines running efficiently and safely wouldn’t be possible without a periodic Hot Section Inspection.

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Aviation Safety: Making Sure You’re Aware of Lancair Mishaps

The Lancair experimental aircraft: beautiful, fast and having what the FAA calls a “disproportionate” number of fatal accidents. There seem to be a higher number of fatal accidents involving Lancairs, which can be powered by the PT6APT6A. We want you to be aware of some statistics and information.

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Why You NEED to Know EDD – Electrostatic Discharge Damage in the PT6A

Last month we disassembled and investigated a 3000 hour time since new PT6A-34AG engine with a #1 bearing failure that appears to be attributable to a phenomenon called: EDD! The damage from the failure combined with damage from the propeller sudden stoppage following the aircraft’s off airport landing has resulted in a BER; an engine that is “Beyond Economic Repair”!

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Understanding Fuel Contamination in the PT6A

The customer had sent in an exchange set of fuel nozzles at his normal change interval of 300 hours. The nozzle set appeared to be reasonably typical in appearance; however, every one of the nozzles exhibited streaking during the spray check as received! Nine of the nozzles cleaned up during the cleaning process and spray checked ok. Five nozzle tips had to be replaced to be able to return the set to service. This was unusual for this operator, and he sought for ideas as to what might be the problem.

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PT6A Engine Maintenance: Basic Stuff, Compressor Bleed-Off-Valve!

The PT6A engines bleed valve lives a tough life! Its job is to get rid of excess air pressure generated by the engine compressor’s first three stages at lower RPMs or power settings. If it doesn’t do its job, the compressor can stall, emitting loud bangs when the pilot tries to accelerate the engine or reduce power, perhaps on approach! If it fails completely, large amounts of power can be lost, even enough to result in off airport landings!

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Tracking Starts And Flights: Understanding Abbreviated Cycles and Full Cycles for PT6 Engine Maintenance

As most of you know, there are life-limited components in a PT6. These components include the CT and PT Disks and the Compressor Disks. After a certain number of cycles they must be replaced.

starts and flights pt6a compressor disk

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