.. with reduced thrust to achieve max RTOW gradients ? ... a good way to see the detail of the countryside.
Last time I did that sort of thing was for a moderate sized 4-engined aircraft proposed to operate into an aerodrome which didn't normally accommodate that size of wee beastie. The level of detail for surrounding obstacle data was such that it was quicker and cheaper to fly the escapes and look rather than do a survey.
Minimum weight and the crew had a ball flying this way and that ... in the jumpseat, I thought it all jolly good fun whilst taking videos and making notes ... the regulatory chap in the other jumpseat kept on shaking his head, muttering ... "I really don't know why we are doing this ..."
.. madness ...