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Old 24th Jan 2009, 10:13
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mcdhu
 
Join Date: Mar 2000
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Absolutely Rick!

The PTU should not run in the normal (as opposed to abnormal) course of events except for a brief self test during the second engine start and on shutdown of the No1 engine on stand if the single engine taxi-in procedure has been used as the No 1 (green) hyd pump (now spooling down) tries to pressurise the yellow system which is no longer pressurised by the yellow electric pump which is switched off immediately before the No 1 eng is shutdown.

Hope that is clear!!

Cheers
mcdhu
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