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pronh
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The U.S. Air Force is blaming a recent F-35A Joint Strike Fighter crash on a tired pilot, a too-fast landing, a misaligned helmet, and a logic issue with the plane’s computer system.
Tired pilot (om det är den kraschen jag tänker på så var det en av instruktörerna på flygtypen och denne har tidigare vittnat om att de blir ovanligt trötta pga hjälmen bl a)
Här har vi i alla fall den officiella haverirapporten:
https://www.afjag.af.mil/Portals/77/AIB-Reports/2020/May/Eglin%20AFB%20F35A%20AIB%20Report_Signed.pdf
"The MP set and held 202 knots calibrated airspeed (KCAS) throughout the approach and landing.
The aircraft touched down approximately 50 KCAS fast, and was approximately 8 degrees more
shallow than desired for landing, at a 5.2 degree Angle of Attack. The aircraft landing lasted
approximately five seconds before the MP ejected.
The nose of the aircraft drove down at a high rate of speed and the nose gear contacted the runway
immediately after the main landing gear. Next, the MA experienced a significant nose-high
bounce. After the initial bounce, the MP made stick inputs consistent with an attempt to recover
and set a landing attitude. However, the MP’s stick inputs quickly fell out of synch with the aircraft
pitch oscillations and aircraft control cycles. Two seconds after touch down, the MP set and held
aft stick, which would normally bring the nose of the aircraft up. Approximately one second after
commanding aft stick the pilot also commanded full afterburner on his throttle. Both of those
actions are consistent with an attempt to establish an attitude that would have allowed the aircraft
to take off and go-around for another landing attempt. The horizontal stabilizers remained in full
deflection down, which would tend to keep the nose of the aircraft down, despite the pilot holding
aft stick for three seconds. After being unsuccessful in the attempt to go-around after multiple and
progressively worsening bounces, the MP released the stick to eject.
The AIB President found, by a preponderance of the evidence, that the mishap was caused first,
by the MA touching down at 202 KCAS, and second, by the MA flight control surfaces, namely
the tail of the aircraft, conflicting with the MP inputs upon landing, resulting in the MP’s inability
to recover from the aircraft oscillation. The AIB President also found by a preponderance of the
evidence that four additional factors substantially contributed to the mishap. The substantially
contributing factors are: the MP landed with Speed Hold engaged and using an alternate crosscheck
method, the MP Helmet Mounted Display misalignment distracted the MP during a critical phase
of flight, MP experienced cognitive degradation due to fatigue, and the MP lacked systems
knowledge on flight control logic. "
Dvs flygplanet lydde inte pilotens kommandon, ungefär som de berömda filmade krascherna för F22 och Gripen-prototyperna. Piloten var trött pga hjälmsiktet var "misaligned" och flög bl a därför för fort vid landningen.
