Instument failures asides, the levels of alcohol must have been a large contributer to this accident.
I carry an alcohol tester with me when flying or driving for any stopovers that will include alcohol the evening before as I can not trust my judgement on levels the following day and would not want to lose my licences or worse.
We are quite often sensitive with our comments regarding accidents on these threads but this one seems to have been waiting to happen.
My apologies if this upsets anyone and if required I can pull the post but I think its relevant.
We must not ever consider flying when under the influence, there are quite often innocent parties involved who are relying on our judgement and skills. If we want to kill ourselves then fine, but this was a needless loss of life.