Originally Posted by
Check Airman
Some people think too hard. I wait a few seconds before starting the APU, as recommended (A320). I've seen more than one person push the start switch immediately after the master though.
That's exactly what maintenance recommended - slow down and give it a second. AB has it in writing. Guys on the Boeing's came up with other ways to slow the process down and allow the steps to occur. Either leaving it in the ON position for some time or using the 'RUN, RUN' technique. Both seemed to work.
I haven't seen the 'RUN, RUN' technique used in years. I'm guessing holding the selector in START and waiting for the 'RUN, RUN' flash was another way to gain additional time for the start process to work.