No Engine Bleed Takeoff B737
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Join Date: Aug 2002
Location: Northern Europe
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No Engine Bleed Takeoff B737
Hi!
My company operates all takeoffs as No Engine Bleed takeoffs to save the engines (B737 Classic + NG).
There has been no documentation put forward to help explain to us how much we actually save by doing this in terms of EGT/saved maintenance costs. Considering the extra fuel burn to the APU and the associated higher maintenance costs - is this really cost effective?
With max derate and assumed temperature of 60 - how much is then saved by using this procedure?
My company operates all takeoffs as No Engine Bleed takeoffs to save the engines (B737 Classic + NG).
There has been no documentation put forward to help explain to us how much we actually save by doing this in terms of EGT/saved maintenance costs. Considering the extra fuel burn to the APU and the associated higher maintenance costs - is this really cost effective?
With max derate and assumed temperature of 60 - how much is then saved by using this procedure?
Per Ardua ad Astraeus
Join Date: Mar 2000
Location: UK
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Quite significant I would guess in terms of TBO on the motors due to the reduced max temperatures achieved - they could always 'drop' the APU and go no bleeds!
Shortly after we introduced the laptop performance calculation tool I had a tower controller ask if we had had an engine failure! The view from the sharp end has changed completely on some takeoffs with long runways and a short sector.
