Aircraft Valuation Factors Every Attorney Should Know

Aircraft show up in a surprising range of legal matters: damage and loss claims, breach of contract disputes, business dissolutions, divorces, bankruptcies, estates, and tax matters. In each one, someone eventually has to answer a deceptively simple question: what was the aircraft worth?

Unlike real estate or vehicles, aircraft value depends on technical details that rarely appear in a purchase agreement or an insurance policy. Two aircraft of the same make, model, and year can be worth very different amounts because of their engines, their maintenance status, or the quality of their records. Attorneys who understand these factors can ask better questions, judge whether an appraisal is complete, and spot problems early.

Here are eight factors that drive aircraft value, and why each one matters in a legal setting.

1. Airframe Total Time

Airframe total time (AFTT) is the total number of hours the aircraft has flown. Higher time generally means more wear, more upcoming inspections, and lower value. For some aircraft, the number of cycles (takeoffs and landings) matters as much as hours.

Why it matters legally: AFTT is usually the first adjustment an appraiser makes against comparable sales. The figure should come from the logbooks, not from a listing or a seller’s summary.

2. Engine and APU Status

Engines are among the most valuable components on any aircraft. Appraisers look at time since new (TSN), time since overhaul (TSO), time remaining until the next hot section inspection (HSI) or overhaul, and the status of the auxiliary power unit (APU).

Enrollment in an engine maintenance program, such as JSSI, Rolls-Royce CorporateCare, or Pratt & Whitney ESP, also affects value, because the program may cover future overhaul costs.

Why it matters legally: An engine close to a major overhaul can change value significantly. If engine times are wrong or unverified, the whole valuation is at risk.

3. Maintenance Programs and Compliance

Appraisers check whether required inspections are current: annual or 100-hour inspections, phase inspections, or A, B, C, and D checks, depending on the aircraft. They also check compliance with Airworthiness Directives (ADs) and the status of manufacturer service bulletins. An aircraft operated under Part 135 (charter) follows stricter maintenance rules than one operated under Part 91 (private use).

Why it matters legally: An overdue inspection or open AD is a real cost a buyer would have to pay. A credible valuation identifies it and accounts for it.

4. Avionics

Avionics affect both what an aircraft can do and what buyers will pay. Equipment required by regulation, such as ADS-B Out, is now expected; aircraft without it are harder to sell. Upgrades such as WAAS/LPV approach capability, modern flight decks, and connectivity can add value, but rarely their full installed cost.

Why it matters legally: Disputes often involve claims that an upgrade added value. An appraiser should be able to explain how much of the cost the market actually recognizes.

5. Interior and Exterior Condition

Paint, interior materials, cabin layout, and overall cosmetic condition all influence what buyers will pay, particularly for business aircraft. Condition should be documented with dated photos and inspection notes.

Why it matters legally: Condition disputes are common in contract and damage claims. Photos and a documented inspection are much more persuasive than general descriptions.

6. Market Conditions

Aircraft values move with the market. Interest rates, fuel prices, global demand, inventory levels, manufacturer delivery delays, and seasonal patterns all affect what an aircraft will sell for.

Why it matters legally: Many cases turn on value at a specific past date, such as the date of loss, breach, or transfer. The valuation must reflect the market on that date, not today’s market.

7. Damage History

Any damage history affects value, even after a proper repair. Appraisers distinguish structural damage from cosmetic damage, review how the repair was done and by whom, and check whether parts are traceable. Sources include NTSB and FAA records, repair station work orders, and photos.

Why it matters legally: Damage history is the basis of diminished value claims. A credible analysis separates the cost of repair from the loss of market value that remains after the repair.

8. Logbooks and Records

Complete, continuous logbooks are essential to aircraft value. Missing logbooks, gaps in the records, or undocumented repairs make buyers cautious and can reduce value substantially.

Why it matters legally: Records are evidence. An appraisal that relies on unverified records is open to challenge.

Bringing It Together

No single factor sets an aircraft’s value. A credible appraisal considers all of them together, supports each adjustment with evidence, and states its conclusions clearly. For attorneys, knowing these factors makes it easier to decide what documents to request, what questions to ask, and whether an appraisal will hold up under scrutiny.

Next in this series: Key Aircraft Valuation Issues in Litigation.