Just remember old age and treachery beat youth and initiative every time.
When you complain to the Minister, remember that your letter goes down through the management chain all the way to the very person you are complaining about. It is that person who then writes the Ministers letter back to you.
That person also has your file on his desk when he does it, and every piece of correspondence your organisation has ever written to CASA is in it, and its all registered and neatly indexed at his fingertips.
Now along with the letter this joker writes for the Minister to sign, he writes a Ministerial brief, no more than Two pages long at the very maximum. The Ministerial brief explains what the bureaucracy has done to investigate the matter you raised, a recommendation about the resolution of the matter, maybe a point of explanation if necessary, perhaps to explain some terminology or construction in the letter, and finally a recommendation that the Minister sign the attached letter.
Assuming your bosses, who all have to read and approve your brief are happy, and the Ministerial adviser is happy it ain't going to cost votes, the Minister is handed the brief and the letter and signs it as well as initialing the brief, which is then returned to you so you can take copies and post the damn thing.
I am telling you this because unless you are absolutely rock solid in your facts, and can prove misdeeds comprehensively, you are going to be hung drawn and quartered very quickly by the very person you are complaining about, and it will be done in the full light of day, watched by senior bureaucrats and the Minister, and there is not a damn thing you can do to stop it once you have mailed your complaining letter.
You have engaged in a dual with a Public servant. His only resource in the public service is his reputation and personal file. If you succeed in besmirching his escutcheon, his career is finished. He will fight you to the death and he has all the resources of the Department behind him.
That is the meaning of the constant use of the word advice by Government Ministers. They always act on advice from a public servant unless they are, to use "Yes Ministers" Sir Humphrey Appelby word "courageous" meaning stupid.
You would need an overwhelming display of industry solidarity to get anywhere with CASA otherwise you will simply be fobbed off as "Several disgruntled Individuals" and dealt with piecemeal in private. Furthermore, your concerns should be couched in terms of helping CASA and the industry improve safety and efficiency, not just carping about one of many administrative decisions that need to be made by CASA every day that wasn't to your liking.
......and finally, I've been a victim of the Friday 4.30 pm letter/fax (in commercial matters, not with CASA or Government). It is a puerile legal insult, since it is extremely unpleasant having to drop everything at that hour and try and find a lawyer and a judge who will give you an immediate injunction.
I would have thought better of CASA.