Comments by "Keit Hammleter" (@keithammleter3824) on "The Kegworth Air Disaster | British Midland flight 92" video.

  1. I'm not a commercial pilot, but I am an engineer. I am surprised that the vibration indication is an uncalibrated 0 to 5 display, given that engine vibration due to a dislodged fan blade may be life threatening. In any engineering field where 1) not taking action may result in further major machinery damage, and/or not taking action may result in person injured or killed, it is well know that the relevant trouble indication shall be a) clear as to its significance, and b) have only just sufficient resolution. For fuel tank capacity, you want lots of resolution, so you can calculate remaining endurance. But for lots of things, they have only 3 possible indications, eg Normal, Abnormal - action required, Danger - take immediate action, or, as in some fields, Normal, Non-Urgent, and Urgent. An indication of 0-10 is rarely if ever used - that level of precision just gives more decision uncertainty and a longer time for the humans to comprehend. In this case, what is the difference between Vibration 4 and Vibration 5? Does 5 require immediate shutdown and 4 does not? What should the pilot do if it's 2 or 3? Take action or just note it for the engineers to look into after landing? Does vibration 5 mean the engine must be shutdown no matter what and vibration 4 means best shut it down unless the other engine has failed completely? It should clearly say so. Perhaps this is covered in training, but that was not and could not be of benefit to the poor pilots in the case of Midland Flight 92.
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