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A recent discussion on the Cessna 150-152 Club forum has sparked industry interest in valuing used aircraft engines, particularly regarding a Lycoming O-235-N2C engine with 6,600 total flight hours. The engine has 300 remaining hours before its recommended Time Between Overhaul (TBO), prompting its owner to seek market valuation advice.

The engine in question has accumulated 2,100 hours since its last overhaul and remains in good operational condition, demonstrating smooth performance and normal fuel consumption. A notable recent upgrade includes a replacement cylinder with only 20 hours of service time. Accompanying the engine is a Sensenich 72CKS6-0-54 propeller, recently inspected and confirmed to meet all technical specifications.

The owner reported preliminary interest from an Anchorage-based buyer considering the components for a Cessna 152 restoration project. However, uncertainty about fair market value led to the forum consultation.

A forum participant named Hung provided a detailed valuation approach based on 2007 data from Dodson International Parts. According to this analysis:

• A salvageable O-235-L2C engine core typically ranges between $2,000-$3,000 depending on negotiation
• Overhaul costs average $15,000 (ranging from $12,000 for field overhauls to $18,000 for factory overhauls)
• With a 2,400-hour TBO, each flight hour carries approximately $6 in value

Applying this methodology to the current engine with 300 remaining TBO hours yields a $1,800 time value plus a $2,000 core value, suggesting a $3,800 total valuation. The owner confirmed this aligned with their initial $4,000 estimate.

Aircraft engine valuation involves multiple technical and market considerations:

• Total Time Since New (TTSN): While higher hours generally decrease value, proper maintenance can preserve performance in high-time engines
• Time Before Overhaul (TBO): Remaining operational hours directly impact valuation, with more hours commanding premium pricing
• Maintenance Records: Comprehensive documentation of service history significantly enhances value
• Current Condition: Operational parameters including smooth operation, fuel efficiency, and absence of abnormal vibrations affect pricing
• Component Completeness: Missing accessories like carburetors or magnetos reduce value by necessitating additional purchases
• Market Demand: Regional availability and demand fluctuations create pricing variability for specific engine models

Accompanying propellers require separate evaluation based on:

• Model Compatibility: Must match the intended aircraft's specifications
• Physical Condition: Blade integrity and absence of damage critically impact value and airworthiness
• Certification Status: Only certified propellers maintain legal operational status
• Market Dynamics: Model-specific demand influences pricing similarly to engines

Industry experts emphasize the importance of professional assessments for accurate valuation. Certified aviation appraisers can:

• Conduct comprehensive physical inspections
• Verify maintenance documentation
• Provide current market comparisons
• Offer maintenance and overhaul recommendations

The growing general aviation restoration market has increased demand for quality used components. However, buyers must prioritize:

• Verification of airworthiness certification
• Thorough pre-purchase inspections
• Documentation of service history
• Compatibility with intended aircraft

The forum discussion highlights the aviation community's collaborative approach to technical valuation questions while underscoring the importance of safety in vintage aircraft operations. Proper component evaluation supports both economic efficiency and flight safety in aircraft restoration projects.