An example of how the defects of the F-35 are hidden.
Excerpts from NASA's report on the F-35's hypoxia problems:
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- "It's the new normal. Breathing in this jet is different than sitting here talking to you and breathing. It shouldn’t be, in my opinion, but it is."
- “Sometimes the F-35 just provides a whole bunch of pressure into the mask for unknown reasons, I don’t know why but it does, it makes exhalation difficult”
- “And then sometimes [the expiratory pressure] will change in the same expiration, like you’ll be expiring, against a certain expiratory pressure and then it’ll kick back at you sometimes or sometimes it’ll go away and it can be somewhat variable, even within the same respiratory cycle. 35 things.”
- “When you’re breathing off the mask in the F-35 you feel like you have to work a little bit harder so you’re a more forceful inhalation, sometimes, you have to more forcefully exhale”
- “The positive pressure isn’t really, in my thinking, isn’t so positive. It can be annoying.”
- “Sometimes even in a single exhalation there could be a change in the pressure. So there’s like a kick back and it can actually bite off a radio call.”
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In summary, rather than the breathing system responding to a pilot’s physiological needs, the pilot is forced to adapt to an unpredictable supply system with potentially adverse consequences. One may ask why such events are allowed to continue. Why do the pilots put up with it? In 2012, the NESC conducted an assessment of the F-22 pilot breathing problems. It was observed that:
The F-22 pilot community has come to accept a number of physiological phenomena as a “normal” part of flying the Raptor. These include the “Raptor cough,” excessive fatigue, headaches, difficulty breathing, and delayed ear blockages. The acceptance of these phenomena as “normal” could be seen as “normalization of deviance.”
This normalization of deviance is part of the F-35 culture as well. Pilots interviewed for this report indicate the F-35 community will endure much adversity to be one of the elite that fly the nation’s newest fighter.
Pilot interviews also highlighted an organizational concern to protect the F-35 program, specifying undue pressure to suppress information and ascribe breathing problems to pilots rather than the aircraft. Previously we have emphasized that PEs happen to pilots, not to planes. The end goal is a breathing system which supports pilot breathing requirements, not aircraft-centric provisions. Hence, measuring pilot breathing metrics is the foundational part of understanding this complex problem.
Page 96
Five F-35 pilot interviews were conducted by a team of three NESC PBA researchers: a flight surgeon, an F-35 SME, and a human factors SME. Each interviewee was provided a NASA Privacy Act Notice which indicated the protected status of the interview and all materials associated with the interview. All interviewees provided explicit consent to video/audio NESC Document #: NESC-RP-18-01320, Vol. 2, V.1.2 Page 96 of 260 recording, interview transcription, and inclusion in this report. All data are reported in aggregate to maintain privacy.
Each interview began with the pilot account of events related to the flight that induced a reported or unreported PE with specific information about the in-flight event, post-flight procedures, and recovery. This was followed by a period of question and answers for clarification and expansion. Finally, pilots were asked to provide perceptions of overall concepts across all airframes such as breathing experience, previous symptoms, common symptomology, and current processes.
As supported by data in Section 5 of this report, the asynchronous breathing and pressures observed in the F-35 breathing system are a significant safety hazard to the pilot. This hazard exhibits as causal to acute and chronic health conditions that impact mission performance and impair the pilot.
Pilots report that interactions with the F-35 breathing system generate symptoms ranging from mild discomfort, cough, and fatigue, to confusion, distraction, extreme discomfort, and near incapacitation. Some symptoms resolved in a range of minutes, hours, or days; others are potentially permanent. Multiple pilot statements indicate an adversarial relationship with the JPO and include statements that reflect
a) a significant chilling towards pilot reporting,
b) an organizational bias to indicate non-aircraft related causes, and
c) an organizational bias to attribute causation to the pilot such as psychogenic/psychosomatic origins, poor motivation, insufficient training, or inappropriate biological preparation habits.
Pilot statements indicating concerns regarding the safety and adequacy of the system were provided to the JPO in verbal and written form, as well as in the formal PE reporting process.
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2.2.3 Pilot Interview Conclusions
The excerpts from F-35 pilot interviews, above, suggest that there a number of problems with the F-35. A more comprehensive record of the pilot interviews is included in Appendix 7.1. The breathing experience in the aircraft is unlike anything these pilots had experienced before.
The F35’s breathing system noticeably discourages the normal breathing function via high-pressure, pressure surges, and hyperoxia. However, the pilots’ desire to fly this new fighter, despite the abnormal breathing experience, has led them to try and adapt as best they can both autonomically and cognitively. A mismatch between pilot expectation of the performance of a system and that system’s actual performance can provide warning of a potential problem.
However, if the observed system performance continues to deviate from expected without formal assessment or protocol correction, expectations will recalibrate to consider the deviated performance as normal. This modifies the importance assigned to the system deviation and reduces the effectiveness of the warning system.
This normalization of deviance can undermine the safety of mission, a pilot, and an entire program. Even flying the F-35 on routine sorties has led to symptoms that include dizziness, cognitive confusion, and severe fatigue. Some pilots who report the onset of hypoxia indicate that is markedly different than hypoxia awareness training.
As difficult as the F-35 breathing system is, it can vary significantly between aircraft as described later in this report. Finally, despite highlighting these issues and requesting that the design of the F-35 breathing system be investigated, a number of the pilots interviewed believe that there is undue pressure to ascribe breathing problems to pilots and suppress information about these problems.