Why limit the bank angle to 10° when passing through FL300 on a B737-800?

0

When passing thought FL300, we are instructed to set the bank angle limiter on the MCP to 10°.

I know one of the reasons for this is that we are thrust limited so maneuver capability decreases.

Are there any other reasons?

por Gabo 19.07.2019 / 09:46

1 resposta

One reason that comes to mind is as you get closer to the canto do caixão, the extra G force due to maneuvering could cause a stall. Quoting from "Stall the Pig",

In the thin air at altitude, jets operate within a very narrow airspeed band between MMO (redline) and the low-speed limit, typically a yellow arc that provides a warning zone prior to a stall, indicated by a lower red line. At high altitudes and high weights, this band—known as “coffin corner”—can be quite narrow, leaving you a mere 10 knots of usable airspeed range, for example. Load up the wing in a turn and that lower redline will quickly move upward toward your airspeed.

By limiting the bank angle, you also limit the G forces, and stay farther away from an accelerated stall.

19.07.2019 / 16:16