这个问题的答案并不在程序里,而是在系统章节的相关 Normal Operation 中,个人觉得至少应该有个 “Ref to”,否则根本想不到。
具体请参考 TechRequest 原文:
Q:
In SOP of PARKING, there's fuel check with the description:
Check that the sum of the fuel on board and the fuel used is consistent with the fuel on board at departure. If the flight crew detects a discrepancy that is not usual, maintenance action is due.
How to determine "not usual"?