Storage & Data Systems for Aviation MRO 2026 — Borescope Video, Engine Trends & Airworthiness Records

Ask an MRO IT manager about storage and the conversation starts with capacity; it should start with retention and traceability. An aviation maintenance organisation operates under a paper-equivalent regulatory regime — EASA Part-145 and Part-M for the European side, FAA Part 145 and its record-keeping rules for the US — in which every inspection, repair and part installation must be reconstructable, by an auditor, years later, often for the life of the aircraft plus a margin. That single fact reshapes the storage design: the requirement is not "big enough" but "provable, immutable and retrievable," and the hardware has to serve a hangar floor where the dust, temperature swings and fuel-tank entry rules are closer to an industrial plant than an office. This guide sizes the storage stack from the data classes up.

The Data Classes Drive Everything

MRO data is not one stream. It is a handful of very different classes, each with its own size driver, retention clock and access pattern — and mixing them on one tier is what makes budgets explode. The video and image classes dominate capacity and are write-heavy and rarely read; the records classes are small but must survive for decades and never be silently altered.

Borescope Video Is the Capacity Hog — Do the Arithmetic First

The instinct is to size storage from the records database; the reality is that a single engine borescope inspection can generate several gigabytes of 4K video that must be stored, reviewed and kept until the next equivalent check — multiplied by the engine count, the inspection frequency and every life-limited part on the airframe. Before buying anything, compute the steady-state ingest: (engines × inspections per year × GB per inspection) plus the analytic stores, then multiply by the retention horizon rather than the fiscal year. A fleet operator who sizes for one year of borescope video and discovers a five-year retention obligation is buying the same capacity twice. The upshot is a familiar industrial pattern: fast hot storage for capture and review, a nearline tier for recent history, and an immutable archive for the retention tail — with the archive, not the hot tier, carrying the bulk of the terabyte count.

Retention, WORM and Chain of Custody

Once a record may be presented to a regulator, "deleted by accident" is not an acceptable failure mode. Airworthiness records demand write-once, read-many behaviour, an audit trail of who accessed what and when, and a chain of custody that survives system migration. That is a governance requirement that translates directly into hardware and software choices: object or tape-based archives with immutability enforced at the storage layer, retention locks the operators themselves cannot override, and cryptographic integrity checks so a bit-rot event surfaces as a failed checksum rather than a falsified record. This is stricter than ordinary enterprise backup, because the adversary is not only hardware failure but also, occasionally, the pressure to make a record say something it does not.

The Hangar Floor Is an Industrial Environment

The capture side runs in a hangar, not a data centre. Ambient temperature swings with the doors; dust, metal swarf and cleaning chemicals are normal; and a fuel-tank or wing-tank entry is a hazardous area where only certified equipment is permitted. A fanless, wide-temperature edge appliance with an industrial SSD is the right capture buffer — spinning disks and commercial-grade SSDs fail here in exactly the way that loses an inspection. Where the work crosses into defence or state aircraft, the storage also inherits ITAR/export-control and data-residency constraints, so the archive may be required to stay on-shore and on-premises rather than in a public cloud region. Each of these is a specification line, not an afterthought, and each has a cheaper commercial alternative that quietly fails the audit.

The Metadata Is the Product

A terabyte of borescope video is worthless to an auditor unless it can be tied to a specific aircraft, engine, serial-numbered part and date. The storage design that matters most is therefore the one around metadata, not the one around bytes: every object needs an immutable association with the airframe and component it documents, a signed operator identity, and a timestamp that survives timezone and clock changes. Where an inspection is re-performed, the system must preserve the superseded record rather than overwrite it, so the history of the decision — not just its final state — is reconstructable. Build the metadata schema and its immutability into the archive from day one; retrofitting provenance onto an existing video store is expensive, and retrofitting it onto a record that has already been questioned is impossible.

Sizing Rules

• Start from the retention obligation, not the capacity quote — the regulatory clock, not the budget year, sets the terabyte count.
• Compute borescope-video ingest explicitly: engines × inspections per year × GB per inspection × retention horizon.
• Put the capture buffer on a fanless wide-temp appliance with an industrial PLP SSD; commercial hardware loses inspections.
• Enforce immutability at the storage layer with WORM and retention locks the operators cannot override.
• Keep a fast nearline tier sized for the next inspection so review never bottlenecks the hangar.
• Log every access with chain-of-custody granularity, and verify integrity with end-to-end checksums.
• Plan for on-prem or on-shore residency where defence or export-control rules apply.