Each sequence was taken separately, but as training proceeded it was incorporated in later sequences, e.g., it was necessary for forced landing practice on which Lowe was engaged when the crash occurred to carry out gliding, descending, climbing and gliding turns, and side-slipping, all of which preceded "forced landings" in the sequences. It was very important that a trainee should do many forced landing descents. These were not complete landings: trainees were instructed not to fly solo below 200 feet, i.e., above any obstacles on the ground, if the field for the exercise has been selected by the trainee himself. The trainee's aim was to reach a position 1,000 feet above the ground on the approach side of the field from which point he could carry out a cross-wind descent to 500 feet immediately opposite the approach path into the field, where he completed his turn into the field, then making the simulated forced landing. By the time he reached 200 feet from the ground above obstacles he should have known whether he could safely land in the field if he continued; but whether he knew this or not at that height he should then have opened the throttle and resumed normal flying: he was not at liberty to go below 200 feet to make sure. Before undertaking this solo exercise, the trainees were instructed about this 200 feet limitation, because of "possible dangers of concentrating too hard on final approach". At the stage that Lowe had reached in his training when this crash occurred, a trainee was "well versed and practised in judging a height of 200 feet". Lowe in fact was very near completion of the whole course.