Hill depot repairs legacy F-16 components to sustain fleet

Official Statements

• Hill Air Force Base, November 10: “HILL AIR FORCE BASE, Utah — When an aging F-16 electronic component fails, replacing it is not always as simple as ordering a new part.

  More than four decades after the F-16 fighter jet entered Air Force service, sustaining individual legacy components can require solutions beyond normal commercial replacement. One example is the F-16’s Signal Acquisition Unit, or SAU.

  Many of the microcircuits and circuit card assemblies inside the unit are no longer commercially produced. At Hill Air Force Base, technicians with the 523rd Electronics Maintenance Squadron repair those legacy units, helping return serviceable assets to F-16 customers across the Air Force.

  The SAU works with the F-16 flight data recorder, commonly known as the aircraft’s “black box.” The recorder retains critical tactical and mishap data, while the SAU collects flight parameters, engine data, structural-load information and stress telemetry.

  “While the Black Box retains critical tactical/mishap data, the SAU acts as the data harvester,” said Scott Brown, 523rd EMXS Electronic Systems Flight chief. “Originally manufactured decades ago, many of the microcircuits and circuit card assemblies inside the SAU are out of production. Standard commercial suppliers no longer fabricate these parts.”

  That obsolescence requires a repair process beyond routine replacement. “Technicians clean, inspect, and troubleshoot the hardware down to the component level,” Brown said. “The unit is placed on specialized test benches to simulate the environment of an F-16 cockpit.”

  During the depot-level maintenance process, technicians replace degraded circuit card assemblies, capacitors and wiring before certifying serviceable units for return to the field. The work includes micro-soldering, circuit card assembly repair, radio frequency and digital testing, and software programming and verification.

  In fiscal 2026, the SAU program met every scheduled delivery commitment, achieving 100% on time delivery while completing 82 shipments to F-16 units worldwide.

  When an SAU cannot be repaired cost-effectively, Brown said the 523rd EMXS can rely on recoverable units from the 309th Aerospace Maintenance and Regeneration Group, or AMARG, to help sustain the repair pipeline.

  Located at Davis-Monthan AFB, Arizona, AMARG is a geographically separated unit of the Ogden Air Logistics Complex that preserves and stores aircraft and provides sustainment services, including parts reclamation. For the F-16 SAU effort, technicians at AMARG remove legacy units from retired aircraft and send them to Hill AFB, where they can enter the depot repair pipeline as repairable units or sources of components needed to restore another SAU to service.

  This collaboration pairs AMARG’s reclamation expertise with the 523rd EMXS’s component-level repair and testing capability.

  “Overcoming obsolescence requires teamwork across the entire Ogden ALC footprint,” said Dan Marcom, 523rd EMXS Avionics Squadron director. “Teaming our specialized technicians with AMARG’s reclamation experts gives retired assets new life.

  “That agility keeps the supply pipeline flowing,” he said.”