To: BLACKSHEEP
True Lu, but each part of the industry acts independently. I know of no case, in any of the four operators that I've worked for over the past thirty four years, where we failed to act on engineering information directly concerning air safety as soon as the information was received.
This is true regarding relatively simple changes to a system such as re wiring or installing a switch or a placard. However, on major design changes such as installing an inerting system in a fuel cell or the redesign of a rudder PCU, the FAA will determine the man-hours to effect the change, the cost of the modification itself, and the lost revenue to the airline(s). With these figures in hand they will perform a cost benefit analysis. This will be done to determine if the cost in human lives and the cost due to hull loss is less than the costs to the airline(s) to effect the change then the FAA will recommend against the change.
If public uproar is strong enough they may reverse their decision.
