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Buying a used PT6 engine can be a cost-effective option, but it requires careful evaluation to ensure you're getting a reliable and efficient engine. Here are the key factors to consider before making a purchase:
- Total Time Since New (TTSN) & Time Between Overhaul (TBO)
TTSN (Total Time Since New): Indicates the overall wear and tear on the engine. A lower TTSN usually means a longer lifespan.
TBO (Time Between Overhaul): PT6 engines typically have a TBO of 3,000 to 6,000 hours depending on the model and operation. If the engine is near its TBO, factor in the cost of an overhaul.
Tip: Engines closer to TBO may seem cheaper but could require a costly overhaul soon.
- Maintenance & Overhaul History
Review logbooks and maintenance records to verify the engine has been properly maintained.
Look for compliance with Pratt & Whitney Canada (P&WC) service bulletins and airworthiness directives (ADs).
Check if the engine has had any major repairs, part replacements, or previous incidents (e.g., foreign object damage or hot starts).
Tip: A well-documented maintenance history is a strong indicator of engine reliability.
- Hot Section Inspection (HSI) Condition
The Hot Section Inspection (HSI) assesses the condition of critical components like the compressor turbine, power turbine, and combustion chamber.
If an HSI is due soon, factor that into the purchase cost.
Tip: Request the latest HSI report to check for excessive wear or damage.
- Engine Cycle Count
PT6 engines have cycle limits on certain components (e.g., compressor and turbine blades).
High cycle counts can mean parts will need to be replaced sooner, increasing costs.
Tip: Choose an engine with a cycle count that allows for extended future use.
- Engine Modifications & Configuration
Some PT6 models have performance upgrades (e.g., enhanced compressor or fuel nozzles).
Ensure the engine configuration matches your aircraft's certification and operational needs.
Tip: Modifications can increase efficiency but should be FAA/EASA-approved and compatible with your aircraft.
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