Segment
Avionics and flight systems: the parts that must never fail
Aircraft systems are designed around a probability target: the failure conditions that would be catastrophic must be shown to be extremely improbable. Everything in this segment — the triple channels, the dissimilar software, the certification process — follows from that single requirement.
In one sentence
Avionics and flight systems are the electronic and mechanical systems that sense, compute and actuate an aircraft's control, navigation and monitoring functions, engineered and certified to quantified failure probability targets.
The design discipline is unlike consumer or even automotive electronics. A catastrophic failure condition must be shown to be extremely improbable, which is demonstrated through redundant channels, dissimilar implementations, continuous self-monitoring and an analysis showing no single failure — and no plausible combination — reaches the unsafe state.
That discipline is why avionics hardware is generations behind consumer silicon. A part must be available and supported for decades, qualified for the environment, and covered by evidence a regulator will accept. Changing it means re-certifying, which is expensive enough that obsolescence management is a permanent engineering activity.
How this breaks down
Split by function — what computes the control, what the crew sees, and what physically moves.
- Avionics and systemsthis page
- Fly-by-wireRedundant channels, dissimilar implementations, and what a flight envelope protection actually does.Definition pageChokepoint
- Cockpit avionicsWhat the crew sees, how the aircraft knows where it is, and why connectivity became a system.Definition page
- Landing gear and actuationHydraulics, electric actuation and the most heavily loaded structure on the aircraft.Definition pageChokepoint
What this depends on
1 of these is marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
- Supply chainChokepoint
Long-life qualified semiconductors
Parts must be supported for decades and qualified for temperature, vibration and radiation, which rules out most current silicon.
Foundry vs IDM - Standard
Software and hardware assurance standards
Airborne software and complex hardware are developed to prescribed assurance levels; the process is the evidence.
Type certification - Standard
Environmental qualification of equipment
Every box is tested against temperature, altitude, vibration, lightning and radiated fields before it is fitted. Equipment that has not been through it cannot be installed however well it works on a bench.
What depends on this
Other pages in this map that name Avionics and systems as something they cannot do without.
Companies across Avionics and systems
Every company named on a step below this page, ordered by how many of those steps it appears at. Compiled from the pages themselves rather than written separately, so the two cannot disagree. Not a ranking and not a recommendation.
- SafranParis3 steps
- ThalesParis2 steps
- BAE SystemsLondon1 step
3 more companies appear at a single step each; they are named on the pages for those steps.
How these pages are written
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.
Plutux is not an investment adviser. Market data and AI-generated analysis are for information and education only, not investment advice. Disclaimer