A pre-purchase inspection (PPI) is the single most important step in any aircraft acquisition. It provides an independent, technical assessment of the aircraft before you commit to the purchase, identifying maintenance issues, damage history, and compliance concerns that may not be apparent from records alone.
Skipping or cutting corners on a pre-purchase inspection is a false economy. The cost of a thorough PPI is a fraction of the expense of discovering significant issues after the transaction has completed.
What a Pre-Purchase Inspection Covers
Records Review
The inspection begins with a detailed review of the aircraft logbooks and maintenance records. The inspector will verify:
- Total time since new on the airframe, engines, and propellers
- Compliance with all Airworthiness Directives (ADs) and Service Bulletins (SBs)
- Maintenance programme compliance and continuity
- Any history of damage, repair, or major modification
- Component life limits and overhaul status
- Engine trend monitoring data
Gaps in maintenance records are a significant red flag. Complete, continuous records from new are expected for any aircraft of meaningful value, and their absence should prompt caution.
Physical Inspection
The physical inspection involves a thorough examination of the airframe, engines, systems, and interior. Depending on the scope agreed, this may include:
- External visual inspection for corrosion, skin damage, and repair evidence
- Landing gear inspection including tyre condition and brake wear
- Engine borescope inspection (examining internal turbine components)
- Avionics functionality testing
- Flight control rigging and operation checks
- Pressurisation system testing
- Interior condition assessment
- Paint condition and thickness measurement
Ground Run and Test Flight
A ground run confirms engine start, idle, and systems operation. A test flight, while not always included in a standard PPI, provides the most comprehensive assessment of aircraft performance and handling. For high-value transactions, a test flight is strongly recommended.
Choosing an Inspection Facility
The PPI should be conducted at an independent maintenance facility that is type-rated for the aircraft and has no commercial relationship with the seller. For UK-based inspections, the facility should hold a CAA Part-145 approval (or equivalent EASA approval for aircraft on European registries).
The buyer typically selects the facility, though the seller must agree to release the aircraft for inspection. Common choices for UK-based inspections include manufacturer-authorised service centres and reputable independent MRO facilities.
Costs and Duration
Pre-purchase inspection costs vary significantly by aircraft type and scope:
- Single-engine piston or turboprop: £5,000 to £15,000
- Light jet: £15,000 to £30,000
- Midsize jet: £25,000 to £50,000
- Large-cabin jet: £40,000 to £80,000
The inspection typically takes three to ten working days depending on aircraft complexity and facility availability. Engine borescope inspections add time but are strongly recommended for turbine aircraft.
Interpreting the Results
A PPI report will typically categorise findings as:
- Airworthiness items: Defects that must be rectified before the aircraft can legally fly
- Recommended items: Issues that should be addressed but do not ground the aircraft
- Cosmetic items: Interior or exterior condition issues that do not affect safety or operations
No aircraft will emerge from a PPI with zero findings. The question is whether the findings are consistent with the aircraft age, utilisation, and asking price. Your broker should help you assess the commercial significance of each finding and use the results to inform negotiations with the seller.
Common Issues Found During Inspections
Experienced inspectors frequently identify:
- Corrosion in areas prone to moisture accumulation
- Undisclosed previous damage or repairs
- Outstanding Airworthiness Directives or Service Bulletins
- Engine performance below manufacturer specifications
- Avionics components approaching or past their service life
- Interior wear beyond what is normal for the stated utilisation
Each of these findings can have significant financial implications. A single engine requiring premature overhaul can represent a cost of £500,000 or more, which is why the inspection investment is so critical relative to the potential downside.
Aviator Aircraft Sales manages the pre-purchase inspection process on behalf of all our buyer clients. We select appropriate facilities, define inspection scopes, review findings, and use the results to negotiate fair outcomes. Browse our current aircraft for sale or contact us to discuss your requirements.