Why no single search is complete

Each source has a different scope.

Use multiple sources and reconcile conflicts.

Start with aircraft identity

Before searching, confirm:

• Registration number and prior registrations.
• Manufacturer, model, series, and serial number.
• Ownership and operating history.
• Engine, propeller, rotor, APU, and landing-gear identities.
• Major configuration changes.
• Jurisdictions where the aircraft was registered or operated.

Registration numbers change. Serial number is the central airframe identity, but related component histories need their own identifiers.

Review the logbooks chronologically

Look for explicit terms and indirect signals:

• Major repair.
• Structural repair.
• Skin, spar, frame, rib, bulkhead, or pressure-vessel work.
• Propeller strike or sudden stoppage.
• Hard or overweight landing.
• Gear collapse or runway excursion.
• Bird, hail, lightning, fire, flood, or foreign-object damage.
• Corrosion removal beyond routine blending.
• Special inspection.
• Ferry permit or unairworthy condition.
• Replacement of major assemblies.
• Extensive paint or interior removal around a localized repair.
• Repeated rigging, alignment, vibration, leak, or pressurization findings.

Do not conclude damage from a keyword alone. Trace the event through findings, engineering, repair, inspection, return to service, and later maintenance.

FAA Form 337 and major repairs

FAA Form 337 is used for specified major repairs and alterations. Review:

• Aircraft and owner identity.
• Repair versus alteration indication.
• Affected unit.
• Conformity statement and return-to-service approval.
• Detailed description and attachments.
• Approved data.
• Dates and certificate information.
• Weight and balance or configuration effects.
• Instructions for continued airworthiness.

Search the FAA aircraft file and the onboard records. A form absent from one source may be present in the other, and an absence is not proof that no major repair occurred.

Approved repair data

The evidence package may rely on:

• Structural repair manual data within its limitations.
• Manufacturer-approved engineering.
• FAA-approved data.
• Supplemental Type Certificate data.
• Designated Engineering Representative-approved data.
• Field-approved data where appropriate.
• Other approved technical data for the work.

Confirm effectivity, revision, damage limits, repair location, materials, fasteners, processes, inspections, and any deviations. “Repaired per manual” is not enough if the exact damage fell outside the manual’s limits.

Work-package review

A good work package can answer:

1. How was damage discovered?
2. What was the measured extent?
3. What hidden areas were opened or inspected?
4. Which non-destructive testing was performed?
5. Which engineering or approved data applied?
6. Who performed and inspected the work?
7. Which parts and materials were used?
8. What tests or functional checks followed?
9. What maintenance entry approved return to service?
10. What recurring inspection or limitation remains?

Connect photographs, measurements, drawings, NDT reports, task cards, materials certifications, and signatures to the summary entry.

Physical pre-buy inspection

A qualified inspector should tailor scope to the suspected event and aircraft type. Potential review areas include:

• Skin contour and surface finish.
• Fastener pattern and condition.
• Doublers, splices, patches, or replaced structure.
• Paint variation or overspray.
• Sealant and corrosion protection.
• Alignment, symmetry, and rigging.
• Pressure-vessel repairs.
• Landing-gear attach structure.
• Firewall, mounts, nacelles, and propeller/engine event evidence.
• Hidden structure using appropriate access and inspection methods.
• Conformity to drawings and records.
• Evidence of cracks, fretting, corrosion, distortion, or recurring repair.

The records review should inform the physical inspection, and physical findings should reopen the records review.

Common damage-event review paths

Propeller strike or sudden stoppage

Determine the event definition applicable to the engine and propeller, inspection required by manufacturer instructions or other applicable data, engine teardown or inspection scope, propeller action, accessories affected, and return-to-service evidence.

Hard or overweight landing

Review triggering data or pilot report, manufacturer inspection criteria, landing gear and attach structure, wing and fuselage structure, findings, corrective work, and any recurring action.

Corrosion

Establish location, depth and extent, removal method, remaining thickness, repair basis, environmental cause, corrosion-prevention restoration, and recurrence inspection.

Lightning or hail

Review structural surfaces, composites, bonding, static wicks, radome, flight controls, avionics, fuel-system concerns, and required special inspections.

Gear-up or runway excursion

Trace structural, skin, antenna, engine, propeller, nacelle, landing-gear, and systems effects—not only visible lower-fuselage repairs.

Accident and incident research

Search authoritative government sources using serial number, current and prior registrations, dates, location, owner/operator names, and aircraft description.

Remember:

• Reportability definitions do not include every damage event.
• A reported event may involve minor or no enduring damage.
• An unreported or nonreportable event can still involve important repairs.
• Registration-number reuse and data-entry errors can create false matches.
• Preliminary reports can differ from final findings.

Verify that a result belongs to the exact aircraft.

Distinguish event, damage, and repair

Keep three separate facts:

1. Event: what occurred.
2. Damage: which structure, system, engine, propeller, or component was affected.
3. Repair: what action returned the product to service.

A bird strike with no damage is different from a repaired leading edge. A repaired crack discovered during inspection may have no discrete accident event. Do not collapse them into one label.

Assess repair quality

A technical reviewer should evaluate:

• Approved-data basis.
• Repair versus damage limits.
• Workmanship and conformity.
• Inspection and NDT results.
• Return-to-service authority.
• Configuration and weight-and-balance updates.
• Instructions for continued airworthiness.
• Repeat findings or adjacent deterioration.
• Effect on fatigue, pressure cycles, corrosion, access, or maintainability.
• Current physical condition.

Well-documented repair history is often easier to evaluate than an unexplained physical repair with “clean” summary records.

Valuation and transaction treatment

Damage history may affect:

• Buyer population.
• Lender or insurer acceptance.
• Appraised value.
• Future inspection cost.
• Resale time and disclosure burden.
• Export acceptance.
• Engine or component program treatment.
• Lease return.

The magnitude is aircraft- and market-specific. Compare similar repaired aircraft where possible, document repair quality and evidence, and avoid an arbitrary universal discount.

Use the aircraft valuation projection model to compare disclosed scenario assumptions; do not treat a modeled adjustment as a substitute for repair evidence or an accepted appraisal.

Transaction documents should define representations, disclosure, inspection rights, acceptance conditions, and remedies with qualified aviation counsel.

Red flags

• Physical repair with no matching record.
• Logbook gap around an ownership or registration change.
• Vague “repaired as necessary” entry.
• Missing approved data or attachments.
• Serial-number mismatch on a Form 337.
• Repair outside published damage limits without separate approval.
• No evidence of required engine action after a propeller event.
• Repeated cracking, corrosion, rigging, or pressure findings near a repair.
• Status report says “no damage” while work records show structural action.
• Seller restricts reasonable records or physical access.

A red flag is a prompt for investigation, not an automatic verdict.

Damage-history review checklist

• [ ] Aircraft serial number and prior registrations confirmed.
• [ ] Complete logbooks reviewed chronologically.
• [ ] FAA aircraft file and Form 337 records obtained.
• [ ] Accident and incident sources searched and identity-checked.
• [ ] Structural and special-inspection keywords traced.
• [ ] Work packages and approved data reviewed.
• [ ] Major component histories reconciled.
• [ ] Physical pre-buy scope reflects record findings.
• [ ] Repair conformity and current condition assessed.
• [ ] Continued-airworthiness actions added to tracking.
• [ ] Valuation, lender, insurer, and contract effects reviewed.
• [ ] Open questions documented before acceptance.

Sources and further reading

• FAA AC 43.9-1G, Form 337 instructions
• FAA AC 43-9D, maintenance records
• 14 CFR Part 43 Appendix A
• 14 CFR 91.417, maintenance records
• FAA field approval process