A pre-purchase inspection (PPI) is a comprehensive evaluation of an aircraft's condition, maintenance history, and airworthiness conducted before a sale is finalized. Think of it as a thorough health check for the aircraft. It protects the buyer from acquiring an aircraft with hidden problems and provides a factual basis for final negotiations.
Why the PPI Matters
No matter how good an aircraft looks on paper or in person, only a thorough inspection can reveal its true condition. Common issues discovered during PPIs include:
- Undisclosed prior damage or repairs
- Corrosion hidden in structural areas
- Incomplete or inaccurate maintenance records
- Non-compliance with Airworthiness Directives
- Engine issues not apparent during normal operation
- Avionics equipment nearing end of life
Statistics from major MRO facilities suggest that approximately 30-40% of pre-purchase inspections reveal significant issues that either kill the deal or result in substantial price reductions. This alone makes the cost of a PPI one of the best investments in the acquisition process.
What Gets Inspected
Records Review
The records review is often the most time-consuming part of the PPI, and arguably the most important. Inspectors examine:
- Aircraft logbooks: Every flight hour, cycle, and maintenance entry since the aircraft was manufactured
- Maintenance tracking: Compliance status of all scheduled maintenance, inspections, and service bulletins
- Airworthiness Directives (AD): Verification that all applicable ADs have been complied with
- Service Bulletins (SB): Status of mandatory and recommended service bulletins
- Modification records: Documentation of all STCs and field approvals
- Damage history: Any incidents, accidents, or substantial repairs
- Engine program status: Enrollment and standing on engine maintenance programs like TAP, JSSI, or MSP
Physical Inspection
The physical inspection covers every major system and structural area of the aircraft:
Airframe
- Fuselage structure and skin
- Wing structure, spar, and skin
- Empennage and flight controls
- Landing gear structure and components
- Pressure vessel integrity
- Corrosion inspection of all accessible areas
Engines and APU
- Borescope inspection of all engine stages
- Oil analysis and trending
- Engine performance data review
- Nacelle and thrust reverser condition
- APU condition and hours
- Engine mount and pylon inspection
Avionics and Electrical
- Flight management system functionality
- Autopilot performance
- Communication and navigation equipment
- Radar and weather systems
- Cabin management system
- Wiring condition and routing
Systems
- Hydraulic system pressure and leaks
- Pressurization system performance
- Environmental control system
- Fire protection system
- Fuel system integrity
- Oxygen system condition
Test Flight
A test flight verifies that all systems perform correctly in actual flight conditions. Typical test flight items include:
- Engine start and ground operations
- Takeoff performance verification
- Pressurization check at altitude
- Autopilot engagement and tracking
- Navigation system accuracy
- Environmental system performance at altitude
- Landing gear extension and retraction cycles
- Normal and abnormal approach and landing procedures
Common Findings
Based on industry data, the most frequent PPI findings include:
- Corrosion (found in ~25% of inspections): Particularly in older aircraft, around lavatories, galley areas, and lower fuselage bilge areas.
- Records discrepancies (found in ~30% of inspections): Missing logbook entries, unsigned maintenance items, or incomplete AD compliance records.
- Unapproved repairs (~15%): Repairs that lack proper engineering authorization or FAA approval.
- Avionics issues (~20%): Equipment that is outdated, non-functional, or not compliant with current mandates.
- Cosmetic wear (~40%): Interior wear, paint condition, and window crazing that may not affect airworthiness but do affect value.
Choosing a PPI Facility
Selecting the right facility for your PPI is critical. Consider the following:
- Authorization: The facility should be an authorized service center for the specific aircraft make and model.
- Independence: Ideally, the facility should be independent of both buyer and seller to ensure objectivity.
- Experience: Ask how many PPIs the facility performs annually on your aircraft type.
- Reputation: Check references from previous PPI customers.
- Availability: PPIs require hangar space and technician availability — book well in advance.
Cost and Timeline
Typical PPI Costs by Aircraft Category
- Light jets: $15,000 - $30,000
- Midsize jets: $25,000 - $50,000
- Large cabin jets: $40,000 - $75,000
- Ultra-long-range: $50,000 - $100,000
Timeline typically ranges from 5-15 business days depending on aircraft complexity and facility workload. Large-cabin aircraft with extensive records may take up to three weeks.
What Happens After the PPI
Once the PPI report is delivered, several outcomes are possible:
- Clean bill of health: The aircraft is in the condition represented, and the sale proceeds at the agreed price.
- Minor findings: Small discrepancies are documented, and the buyer and seller negotiate who pays for corrections. This is the most common outcome.
- Major findings: Significant issues are discovered that substantially affect value or airworthiness. The buyer may renegotiate the price, require the seller to make repairs, or walk away from the deal.
- Deal breaker: Undisclosed damage history, pervasive corrosion, or fabricated records may terminate the transaction entirely.
Tips for Buyers
- Never skip the PPI to save money or expedite the deal
- Attend the PPI in person or send a representative
- Request a detailed written report with photographs
- Have your own technical advisor review the findings independently
- Understand the difference between "airworthy" and "good condition" — an aircraft can be legally airworthy while still having significant issues that affect value and reliability
