Thanks for the answers so far...so are we saying Boeing went to the trouble of utilising an APU fire warning horn....in the wheel well to let us know we can't align the IRS.
It obviously does the job.....also tells the entire airport that the guy doing the cockpit checks has got his check sequence wrong
Just curious as to why they wouldn't consider the on DC light enough of a warning.
Is EW73 onto something? The "Therefore my answer to you is yes" has thrown me
