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B737-300 Reduced Thrust Climb

 
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K.Haroon
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Joined: 11 Dec 2005
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PostPosted: Thu Feb 07, 2008 3:18 am    Post subject: B737-300 Reduced Thrust Climb Reply with quote

Engine service life may be extended by operating the engines at less than full climb rated thrust. The FMC provides two reduced thrust climb selections on the N1 limit page.

- CLB 1 Approximately 10 % derate of climb thrust

- CLB 2 Approximately 20 % derate of climb thrust

Reduced thrust climb may also be selected automatically by the FMC depending upon the amount of thrust reduction made for takeoff by either the fixed derate or assumed temperature method.

Climb thrust reductions are gradually removed as the airplane climbs until full climb thrust is restored. If rate of climb should drop below approximately 500 fpm, the next higher climb rating should be selected.

Use of reduced thrust for climb increases total trip fuel and should be evaluated by each operator.
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