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out of 36 alerts were missed during the approach and landing phases across 12 pilots. 11 Secondly, the lack of relative motion of the fixed HUD combiner glass and its frame compared with the external scene is also a possible source of problems. Karar and Ghosh supposed that the combiner frame forced pilots to adjust their head position to observe the obscured part of the outside world, resulting in some events being missed on the HUD. 13 Another adverse effect, commonly referred to as cognitive tunneling, occurs when the user’s attention is diverted from important