F-35 Full Mission Capable Rate Collapses to 25%; GAO Cites Sustained Readiness Decline
The FMC collapse exposes a deeper industrial problem: Lockheed Martin's sustainment model assumes a mature, stable supply chain for 5,000+ line-replaceable units across 19 allied air forces. If 75% of the fleet is down at any moment, spare parts demand spikes unpredictably, and the supplier base — already fragmented across 2,000+ contractors — cannot absorb the variance without price escalation or delivery delay.
This forces a choice: either the Pentagon funds a 40% increase in F-35 sustainment spending (estimated $800M-$1.2B annually across DoD and allies), or operational availability stays at 25% FMC indefinitely.
Lockheed Martin's F-35 program now delivers a platform where three of four jets cannot perform their assigned mission on any given day — a readiness floor that forces INDOPACOM, USAF, and allied air forces to size inventories upward by 30-40% just to field equivalent operational strength.
The 25% FMC rate means a 48-aircraft carrier air wing operates like a 12-aircraft wing; a 72-aircraft fighter squadron behaves like an 18-aircraft squadron.
This cascades into force structure planning: if USAF needs 200 combat-ready F-35As but only 25% are mission-capable on average, the service must procure roughly 800 airframes to sustain that requirement — a hidden cost multiplier that hasn't yet surfaced in the FYDP.
Watch the FY27 Program Objective Memorandum (due to Congress in February 2026) for whether Air Force and Navy adjust inventory targets upward or hold the line and accept degraded operational availability.
What is the root cause distribution? The GAO report likely breaks down the 25% FMC rate by failure category (avionics, engine, sensor, structural, supply chain). Which single failure mode is the binding constraint — the one that, if fixed, would unlock the fastest readiness gain?
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