The pre-buy inspection, explained: what happens before you buy a pre-owned business jet

Somewhere between the handshake and the closing, every pre-owned jet sale pauses for the same ritual: the pre-buy inspection. It is the buyer's last chance to find out what they are actually acquiring, and it is the seller's last chance to stand behind what they claimed. Nothing else in the transaction is quite as consequential, yet it remains one of the least understood steps in aircraft acquisition.

What the pre-buy is, and is not

First, the clarification that matters most: the pre-buy is not an official regulatory inspection. Its scope is agreed in advance between buyer and seller, which means no two are exactly alike. Per AIN, the work is typically performed by an MRO or technical-services firm independent of the seller, often an OEM-authorized facility, so the eyes on the aircraft have no stake in the outcome.

The most common regime is two-stage, per the CCB Journal. Stage one is a document review and ground inspection to confirm the aircraft is as represented: correct make, model and equipment, substantially complete records, and a damage history that matches what the seller disclosed. Only when that checks out does the deeper technical inspection begin.

What the inspectors actually check

A thorough evaluation is exhaustive by design. The core elements, per AviationPros and CLA Aviation:

• A nose-to-tail visual inspection equivalent in depth to an annual-type inspection.
• A borescope inspection of each engine, unless the engines are enrolled in an OEM program whose administrator does not require one.
• A full logbook chronology going back to the aircraft's birth, verifying manufacturer-recommended inspections, airworthiness limitations and component overhauls.
• Verification of every applicable FAA Airworthiness Directive.
• Fluid and fuel leak checks, windows and windshields, and a corrosion inspection.
• Functional checks of avionics and aircraft systems.
• A technical and aesthetic review of exterior paint and the interior.

Test flights are commonly included as well, so the inspector can assess flight controls, engine operation and overall flightworthiness, particularly where the physical inspection raised questions.

Timing: not a weekend job

Buyers in a hurry should recalibrate. Per CLA Aviation and AIN, the inspection itself can take from a few weeks to a few months depending on the aircraft's size and the depth of the agreed scope. One MRO reports producing its discrepancy list, the squawk list, in about 10 to 14 days. The gap between the inspection's completion and the aircraft's return to service then ranges from days to months, depending on how efficiently buyer and seller communicate and how quickly parts can be sourced.

The report, the negotiation, and the letter of intent

Findings go into a detailed report, and that report is a negotiating instrument. Per AIN and Acumen, the seller generally performs repairs within the agreed scope, but significant cost increases can reopen the price negotiation. A surprise no one budgeted for is still leverage.

All of this is why the buyer's letter of intent should establish the inspection facility, the scope, test flights, timing, who pays the inspection and ferry costs, and each party's rights after a successful or unsuccessful inspection, per the CCB Journal. As AIN notes, a reputable broker will not recommend buying without a detailed pre-buy performed by someone who knows that make and model.

The inspection also feeds directly into valuation. Vref lists the inputs it informs: airframe hours, engine hours, AD compliance, damage history, paint and interior condition, and maintenance-program enrollment. Get the pre-buy right and the price you pay is anchored in evidence rather than optimism.

The pre-owned market keeps this machinery busy. Basel-based Air Doc Services completed its 75th business-aircraft pre-purchase inspection in August 2025, per AIN, averaging one every two weeks over three years, a fair indicator of sustained transaction activity.

Photography: via Wikimedia Commons, CC BY