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USAF: Frozen, Contaminated Hydraulic Fluid Caused Alaska F-35A Crash, $197 Million Loss

Investigators traced the freezing to water in a maintenance barrel, reflecting procedural lapses at the 355th Fighter Squadron.

A U.S. Air Force F-35 Lightning II, assigned to the 355th Fighter Squadron, takes off during Red Flag-Alaska 24-3 at Eielson Air Force Base, Alaska, Aug. 22, 2024. (U.S. Air Force photo by Senior Airman Julia Lebens)
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F-35A crash at Eileson AFB

Overview

  • The Jan. 28 mishap at Eielson AFB began when the nose landing gear failed to retract and sat canted left after takeoff in subzero temperatures.
  • The pilot held for about 50 minutes as personnel consulted Lockheed Martin engineers, then performed two touch-and-go attempts to recenter the gear.
  • Ice inside the main gear struts led weight-on-wheels sensors to misread the jet as on the ground, triggering ground-mode flight controls while airborne and causing loss of control.
  • The pilot ejected safely and the aircraft, tail number 19-5535, crashed within the base perimeter with no injuries on the ground reported.
  • The investigation found roughly one-third water in the hydraulic service barrel and documented significant procedure and recordkeeping lapses, with a similar nose-gear issue reported on another F-35A nine days later.