I have to chime in on this subject. First I disagree with FNFAL on the 2500 hour requirement. Your time in your logbook alone is not a good judge of your piloting skills. I know people with thousands of hours and I hesitate to call them pilots. I know a few people with much less time logged who have skills that can't be denied. I have just over 540 hours in my log book and have failed two checkrides. I failed the Private, and commercial multi.
The commercial multi checkride was failed because the examiner noticed the database was expired on the GPS. The examiner waited until I was airbourne and after I entered the airport and procedure into the Garmin 430 he shut off the GPS map screen. I didn't put the VOR frequency in use to back up the GPS and he instantly failed me. I deserved the failure and went back up with the instructor for an hour and did several approaches with the GPS screen blanked out. The problem is that when you turn off the screen you lose DME as well.
I went into the office of the DE the morning of my second attempt and told the examiner that the GPS is still out of date but I have cross radials that I could use for situational awareness (psuedo dme). The cross radials will tell me when I am in the zone of ambiguity while tracking to a VOR for a VOR approach. The DE said that I couldn't do that. This was at 9:00 am and my ride was to be at 12:00 pm. I said to the examiner that if he wasn't going to let me use the GPS or cross radials for the approach which is legal, that he must just want to fail me again. I was angry to no end.
The DE hopped in the plane and I started the engines. I was still angry with him and I knew that no matter what I did or how well I fly, he is still going to fail me. Having nothing to lose, I turned on the GPS and then turned to the examiner and warned him that if he touched the GPS I was going to break his arm. I stated that I know that he is going to fail me but when we are done, I would be the only one getting out of the plane with two working arms. He didn't touch the GPS and passed me as well.
Here is where the story gets real interesting. I was training for my CFII/MEI ratings and asked the CFI if I could get a different DE instead of the DE we used before. He said no, just don't give the DE a hard time again and I would be fine. I had to call the DE and schedule the ride and I gave him my name. He asked me if I remembered what happened 6 months earlier with him and I told him I did. I also told him that I would bring enough money to pay for four checkrides instead of two as I was convinced that he would fail me on both the CFII and the MEI. I am pleased to say that he passed me the first time on both rides and he still has the use of both arms.
The moral of the story is that the DE could have given me a minute to put the VOR frequencies in the box as well instead he pulled the trigger the second he turned off the screen. It was an A Hole move but he did teach me a lesson. All the time during my training for various ratings, I never had airplanes with GPS or DME. Upon getting an airplane with GPS, I got lazy and didn't put he frequencies to VOR's to use. I deserved the failure and I even thanked him for pointing out my error, but the way he treated me on the re-test was uncalled for.