April 2003 Issue
I enjoyed your article on Battle of the Back-ups. The first thing I look for in any article regarding vacuum pump failures is any comment about a warning light. None being present, I will continue my assertion that this simple, inexpensive item should be a must in any airplane venturing into IMC.
I have had three pump failures in 35 years of flying and I assure you, it is an insidious occurrence, as was well documented in your research project. Fortunately, they were all in VMC. On one occasion, I decided to let it do its thing (on autopilot) and it was soon progressing into a very nice spiral.
It takes 6.7 minutes to recognize a vacuum failure? I would...
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