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Evidence for an Issue 3 pieces of evidence for this issue.

software versions may proliferate (Issue #134) - Different software versions running on the flight management systems (FMSs) of different airplanes may create difficulty for pilots to use them safely and effectively.

  1.  
  2. Evidence Type: Excerpt from Survey
    Evidence: 14 of the 30 (47%) respondents reported a 4 (= agree) or 5 (= strongly agree) with pc134 software versions may proliferate
    Strength: +2
    Aircraft: unspecified
    Equipment: automation
    Source: Lyall, E., Niemczyk, M. & Lyall, R. (1996). Evidence for flightdeck automation problems: A survey of experts. See Resource details

  3.  
  4. Evidence Type: Excerpt from Survey
    Evidence: 1 of the 30 (3%) respondents reported a 1 (=strongly disagree) or a 2 (=disagree) with pc134 software versions may proliferate
    Strength: -1
    Aircraft: unspecified
    Equipment: automation
    Source: Lyall, E., Niemczyk, M. & Lyall, R. (1996). Evidence for flightdeck automation problems: A survey of experts. See Resource details

  5.  
  6. Evidence Type: Excerpt from Survey
    Evidence: "Pilots were asked to describe instances where FMS behavior surprised them and to indicate modes/features of FMS operation that they did not understand. There were no sharp boundaries between the incidents elicited by the two questions. Pilot reports are categorized according to their underlying theme." ... There were 54 reports [54 / 135 = 40%] in the category: "Data Entry ... There was a large number of reports related to the rejection of attempted input into the CDU due to different software versions running on the FMS. While the survey was underway, three slightly different FMS software versions were in use. According to the reports, this resulted most frequently in unsuccessful attempts to enter a new crossing restriction during the approach because the required data entry format and procedure is not the same for the three software versions." (page 307,311)
    Strength: +1
    Aircraft: B737-300
    Equipment: FMS
    Source: Sarter, N.B. & Woods, D.D. (1992). Pilot interaction with cockpit automation: Operational experiences with the Flight Management System. International Journal of Aviation Psychology, 2(4), 303-321. Lawrence Erlbaum Associates. See Resource details
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