As a company pilot, no matter how good one is you only have access to AFM, FCOM, FCTM. While that's good enough to understand manufacturer's procedures but not enough to modify them because all the software, hardware , wind tunnel results that developed the design philosophy are not accessible. Besides as a manufacturer Airbus reach to airlines is global. So if someone wants to change something in Korea then that already may have been tried and is a cause of an incident in Argentina. So manufacturer's consent can avoid a repeat. I have stated many times before an example of Jetstar Australia changing the FMA call, during go around to only after gear up. In poor visibility in a go around the Capt inadvertently pushed thrust levers short of TOGA and due to changed procedure waited for gear up to check the FMA. Copilot couldn't call gear up because he kept waiting for +ve climb as aircraft kept descending in approach mode. They reached 30ft before they pulled up. There were two more airlines that had the same incident. In worst case they were 14ft from runway and confused as to why aircraft is not climbing. All changed their procedures back to previous. So innocuous change of FMA call can become a tragedy.
Last edited by vilas; 28th Sep 2021 at 09:37.