What Is a Pre-Buy Inspection?
A pre-purchase inspection — commonly called a pre-buy — is a comprehensive mechanical, airframe, and avionics evaluation of a used aircraft conducted by an FAA-certified mechanic or inspection authorization (IA) holder before the sale closes. It is not the same as an annual inspection, though a well-structured pre-buy will often cover similar ground. The purpose is to give the buyer an independent picture of the aircraft's actual condition before money changes hands.
Pre-buy inspections are not legally required, but any lender financing a used aircraft transaction will require one before funding. From the lender's perspective, the aircraft is the collateral. They need confirmation that the collateral is airworthy, accurately represented, and free of undisclosed damage history before committing to a loan. If a seller resists a pre-buy, that resistance is itself a data point.
What a Pre-Buy Covers
A thorough pre-buy inspection examines the aircraft across several categories:
Airframe and Structures
The inspector will examine the fuselage, wings, and control surfaces for corrosion, cracks, damage history, and evidence of prior repairs. On composite aircraft like a Cirrus, this includes checking for delamination or impact damage that may not be visible on the surface. The logbooks are reviewed to verify that all damage and repairs are properly documented.
Powerplant
Engine compression tests are standard. The inspector will check engine logs for time since new (TSN) and time since major overhaul (SMOH), verify the engine is within its TBO window, look for evidence of oil leaks or metal contamination in the oil filter, and review any AD compliance relating to the engine or propeller.
Avionics and Electrical
All installed avionics are tested for function, including autopilot, GPS, transponder, comm radios, and any installed weather or traffic systems. IFR currency of pitot-static and transponder systems is verified. ADS-B compliance is checked if not already confirmed.
Airworthiness Directives
The inspector will verify compliance with all applicable ADs for the airframe, engine, propeller, and installed components. An open or recurring AD that has not been addressed is a financing concern — lenders will not fund an aircraft with unresolved mandatory airworthiness items.
Logbooks and Documentation
Logbook continuity is examined from the aircraft's first entry forward. Gaps, erasures, or missing entries raise questions about undisclosed events. The FAA registration, airworthiness certificate, weight and balance, and Pilot's Operating Handbook (POH) are verified to be on board and current.
Operational Test Flight
A complete pre-buy should include a test flight (or at minimum, a high-power ground run) piloted by the seller or their agent, with the inspector or buyer observing. This verifies that the autopilot engages, the avionics communicate in the air, and the engine temperatures remain within limits under load.
If a seller resists a pre-buy inspection, that resistance is itself a data point.
Who Performs the Pre-Buy
The buyer selects and pays for the pre-buy inspector — not the seller. This is non-negotiable. A seller-selected mechanic is not independent, regardless of their credentials.
The best choice for most transactions is a shop or mechanic that holds an FAA Inspection Authorization (IA) and has specific experience with the aircraft type you're buying. For Cirrus, use an authorized Cirrus Service Center. For a Van's RV-10, find a mechanic with hands-on EAB experience. For a Pilatus or TBM, use a factory-authorized service center. Generic shops can perform the physical inspection, but type familiarity materially improves the quality of the findings.
Your lender does not select the inspector, but if you use a well-regarded shop the process moves faster. Lenders have seen reports from shops they know — an unfamiliar shop's report may require follow-up.
What a Pre-Buy Costs
Pre-buy costs vary by aircraft type and complexity. As a general guide:
Typical Pre-Buy Cost Ranges
- Simple certified piston (Cessna 172, Cherokee): $500 – $1,500
- Complex certified piston (Cirrus SR22, Mooney, Bonanza): $1,500 – $3,500
- High-performance or turbocharged piston (SR22T, TBM 700-series): $2,500 – $5,000+
- Experimental / EAB (Van's RV series): $800 – $2,500 depending on complexity
- Single-engine turboprop (PC-12, TBM 9-series): $5,000 – $12,000+
- Light jet: $8,000 – $20,000+
These figures do not include ferry costs if the aircraft must be flown to an inspection facility, or the cost of any discrepancy work discovered.
How Pre-Buy Results Affect Your Financing
The pre-buy report is a required document in your loan file. Lenders review it before issuing final approval and funding. Here is how findings affect the transaction:
Clean Report
No discrepancies, all ADs current, logbooks complete, systems functional. The lender proceeds to funding on the agreed timeline. Most straightforward transactions close within 3–7 days of a clean report.
Minor Discrepancies
Typical wear items, minor deferred maintenance, or items that do not affect airworthiness. The lender will generally proceed, sometimes requiring a written acknowledgment that the items will be addressed. The purchase price may be renegotiated to reflect the cost of corrections.
Significant Findings
Structural damage history not disclosed in the listing, open ADs, compression significantly below limits, or major avionics failures. The lender may require repairs before funding, reduce the loan amount, or in some cases decline the aircraft entirely. The buyer at this point can renegotiate the price, require the seller to remedy items before closing, or walk away. Earnest money agreements should address this scenario before the pre-buy begins.
Logbook Issues
Missing logs, gaps in the entry history, or evidence of alteration are treated seriously. A lender cannot underwrite an aircraft whose maintenance history cannot be verified. If logs are incomplete, the transaction typically cannot proceed without additional documentation from prior owners or maintenance facilities.
What Lenders Specifically Look For
- Written pre-buy report from an IA or authorized service center
- Confirmation that all ADs are current and documented
- Current annual or condition inspection (within 12 months for certified; current condition inspection for EAB)
- Engine time documented and consistent with listing representations
- No open damage history or undisclosed major repairs
- Logbook continuity verified from first entry
The Pre-Buy in the Financing Timeline
Understanding where the pre-buy sits in the transaction sequence avoids costly mistakes:
Step 1
Pre-Qualification
Confirm your credit and income profile before making an offer. Know your budget and loan terms before you spend money on a pre-buy.
Step 2
Letter of Intent / Purchase Agreement
Agree on price, subject to pre-buy. The agreement should explicitly give you the right to walk away or renegotiate based on pre-buy findings.
Step 3
Pre-Buy Inspection
Buyer selects and pays for the inspector. Aircraft is flown or ferried to the inspection facility. Report delivered to buyer — typically 1–5 days depending on aircraft complexity.
Step 4
Report Review and Renegotiation
Buyer and lender review findings. Clean: proceed. Findings: renegotiate, require repairs, or walk away.
Step 5
Title Search
FAA Aircraft Registry title search confirms no liens, encumbrances, or ownership disputes. Typically runs concurrently with the pre-buy.
Step 6
Final Approval and Funding
Clean pre-buy report + clear title = lender issues final approval. Closing documents executed. Funds disbursed. Aircraft registered to buyer.
Choosing a Pre-Buy Shop: What to Ask
When evaluating pre-buy inspection shops, ask these questions before booking:
- Do you hold an FAA Inspection Authorization? Required for signing off an annual inspection. Not required to perform a pre-buy, but it indicates a higher level of credentialing.
- Have you worked on this specific type? Type experience is more important than geographic convenience. An IA who has done fifty Cirrus annuals will find things a generalist misses.
- Will you provide a written report? A verbal summary is not sufficient for a lender. You need a written document with itemized findings.
- What does your fee cover, and what triggers additional charges? Some shops quote a flat rate; others bill by the hour. Understand the billing model before you commit.
- What is your turnaround time? Most transactions have time pressure. A shop that books two weeks out when you have a 30-day purchase agreement window is a problem.
Pre-Buy Inspection: Common Questions
Can the seller's current mechanic perform my pre-buy? +
No. The mechanic performing your pre-buy must be independent of the seller. A shop that has been maintaining the aircraft for the seller has a relationship that compromises their independence, even if they are technically qualified. Select your own inspector.
Does a recent annual inspection substitute for a pre-buy? +
Not exactly. An annual is a regulatory compliance checklist that requires opening every inspection panel. A pre-buy is a targeted financial and safety evaluation designed to find expensive problems (like cam lobe wear or spar corrosion) and verify the seller's representations. While a pre-buy might not open every single panel, it focuses heavily on logbook forensics and high-risk components. If an aircraft is due for an annual anyway, many buyers will negotiate to have the shop perform an 'annual used as a pre-buy' so they start their ownership with a fresh 12-month clock. The two serve different purposes and lenders require a pre-buy in addition to proof of annual currency.
Who pays for repairs found during the pre-buy? +
This is negotiated between buyer and seller. Common outcomes: seller pays for all discrepancies, buyer accepts aircraft as-is with price reduction, or specific items are repaired as a condition of closing. Your purchase agreement should address this before the pre-buy begins. Never agree to buy as-is before you have the pre-buy report in hand.
What happens if the pre-buy finds major damage history? +
It depends on the nature and documentation of the damage. A well-documented, properly repaired major repair that has been flying without incident is different from undisclosed damage with missing logbook entries. Lenders evaluate on a case-by-case basis. Undisclosed damage history that contradicts the listing representations is typically a transaction-ender unless the seller can provide documentation resolving the discrepancy.
Can I use the pre-buy report to renegotiate the price? +
Yes, and this is one of the primary reasons buyers conduct pre-buys. Findings that require remediation have a cost. Buyers routinely use the cost of required repairs to renegotiate the purchase price downward. Your purchase agreement should explicitly preserve this right.
How long does a pre-buy take? +
For a simple certified piston, one to two days of shop time is typical. A complex high-performance single or turboprop can take three to five days. Add travel time if the aircraft must be ferried to the inspection facility. Build at least one week into your purchase agreement timeline for the pre-buy process.
Does my lender need to see the pre-buy report? +
Yes. The written pre-buy report is a required document in the loan file. Your lender will review it before issuing final approval. If you work with FLYING Finance, we will walk you through exactly what needs to be in the report and flag any items that may require follow-up before funding.
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