Saturday, March 9, 2013

✈ What is the Climb Rate of a 737 ✈

Pilots technical answers for - what the normal climb rate of a Boeing 737 would be.

First things first, climb rates depends on temperature, humdity, air pressure, the aircrafts center of gravity (passenger placement/weight, fuel weight/placement, cargo placement/weight) and cost v. speed considernations..

The initial climb rates can be in excess of 3000FPM, but the Boeing 737 can't sustain that rate of climb above roughly 7000 feet due to the air density. However 1800 is about average climb rate from around 12000 up to the flight levels. Depending on load.

1800 speed is considiered a "normal climb rate" and also found in the manual. You can of course increase the speed if you'd like, but you would have to watch out for stalls. Aircraft are set up in such a way so that you don't want to slow down too much while making your climb.

I'll usually start at about 2000fpm in the Boeing 737. Until around 30000 ft, when the speed starts dropping. To get to cruise of 35,000 or above, I find I have to drop the fpm down to 1000 to prevent stalling..

The below climb profile is SIMPLIFIED and not 100% real-world.
Boeing 737 climb rate - climb profile.

Set throttle to 98% N1 and takeoff at V2+10 (about 150kts) and hold this till ~1500' above the runway.

At 1500’ pitch down by 1/2 whatever v/s you needed to hold 150kts. (ex., if you were climbing at 3000 v/s pitch down to 1500 v/s) and reduce throttles/thrust to engine N1 at 92%. as the aircraft accelerates retract flaps (all up no later than 200-210kts) and as you approach 250kts increase pitch so you hold 250kts. watch the engine N1 as it may change. adjust throttles as necessary to hold about 92% N1.

As you continue climb adjust pitch to hold 250kts.

At 10000' (USA) pitch down by 1/2 whatever v/s you are at to hold 250kts to accelerate to 300kts. pitch up to hold 300kts. watch the engine N1 as it may change. adjust throttles as necessary to hold about 92% N1.

As you continue to climb adjust pitch as required to hold 300kts. watch the engine N1 as it may change. adjust throttles as necessary to hold about 92%.

When the aircraft reaches M0.74 (somewhere between 25000' and 27000') begin following M0.74 (and allow the indicated knots to fall -THIS IS NORMAL!).

Keep M0.74 for the rest of the climb. adjust pitch as required. watch the engine N1 as it may change. adjust throttles as necessary to hold about 92%.

When you reach cruise altitude NG someplace between 35000' and 40000'. Allow the aircraft to accelerate to M0.78-M0.80 and then hit the speed hold button on the autopilot.

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