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Old 13th July 2004 | 21:14
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BOAC
Per Ardua ad Astraeus
 
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
On a 737, 40% is the normal run-up RPM, (70% if engine icing is suspected). 40% gets both large fans over the variable acceleration part of their speed range and they should then both run-up together - which helps to stop the aircraft going sideways
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