Originally Posted by
DozyWannabe
You don't know that - the change itself may be minor, but the surrounding modules must all be tested to make sure there are no adverse effects. The development process is considerably different to any other software development methodology - even other real-time systems.
Testing is part of an upgrade, and it is proportional in all aspects to the type of system, and the type of manufacturer. Don't get into assumptions territory with my knowledge base, and let's keep things at their real scale and/or proportions. It's up to Airbus to have a clean, efficient, straight forward process, or a complicated mess. It is expected that theirs is not bellow - actually it could be very well above - the level that is considered norm in such type of critical systems - appropriate level of automation/simulation, etc.. .