strangely enough every time i hear the noise going away i look at the press page and see the extract valve in amber closing then closed green.
don't look at it anymore as i assumed it is the valve.
now looking at the fcom i see if the oat is above 35c the extract valve will be in partial open until the air cools to below 32c during climb maybe thats why the valve shows half open in amber before the noise goes away.
(ok amber means.. in transit or partially open)
what do you think..
Last edited by MD83FO; 6th Dec 2010 at 09:19.