Field Notes

Notes from the other 10%.

Occasional writing on what changes when software has to hold up: embedded aviation hardware, cabins with no network, and data models that have to survive an audit.

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AviationSeptember 8, 2026 · 7 min

What DAL D actually means for a cabin software team

DO-178C Level D is the lowest assurance level that still has teeth. What it does and doesn't ask of the people writing the code, and why the discipline is worth keeping when nobody is checking.

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EmbeddedSeptember 1, 2026 · 6 min

What shipping software on an LRU actually changes

Software installed in an aircraft as a line-replaceable unit inverts modern app development: no updates, fixed hardware, and a boot that has to be right every time.

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AviationSeptember 1, 2026 · 7 min

Offline-first isn't a feature in a cabin. It's the floor.

At 43,000 feet there is no cloud to fall back on. What that constraint does to state synchronisation, command acknowledgement, and every optimistic UI pattern you have ever shipped.

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DataSeptember 1, 2026 · 6 min

Correct by construction: data models that survive an audit

Most schemas are designed for the queries you have today. Regulated platforms need one designed for the questions an auditor will ask in three years, without paying for it in throughput.

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