experience a ground collision with another aircraft while both aircraft were on the ground?
As with question GE2, this question provides no definition of what constitutes nearly. Parts A through C of this question ask where the near collisions occurred, but provide no definition of near collision. Refer to the explanation above, provided for question GE2.
TU1. During the last (TIME PERIOD), how many times did an aircraft on which you were a crewmember encounter severe turbulence that caused large abrupt changes in altitude, airspeed, or attitude? [Question GTU1 on the GA questionnaire asks for the same information.]
The interpretations of the terms severe turbulence or large abrupt changes in altitude, airspeed, or attitude can vary considerably. Even if definitions had been provided, it is unlikely that the extent of the turbulence or change in altitude, airspeed, or attitude could be verified with needed accuracy without post-flight analysis of the flight data recorder. In addition, question TU1 asks the respondent to combine multiple events into a single response.
WE1. During the last (TIME PERIOD), how many times did an aircraft on which you were a crewmember lack accurate weather information when crewmembers needed it while airborne? [Question GWE3 on the GA questionnaire asks for the same information.]
The question does not provide a definition of what constitutes accurate weather information. The perception of the extent to which the weather information was accurate or sufficiently accurate for their needs is likely to vary among respondents. As noted before, cognitive testing of the question would have been appropriate.