Following an all flaps up (no flap) landing, the SPEED BRAKE lever will not move beyond the FLIGHT DETENT and the spoilers will not fully deploy (for reference this is stated in the Fcom 9.20.14 rev 2013).

What is the reason for this? With flap up the speed will be high and if we could use the full deflection, we can reduce the landing distance, so why restrict it?

  • $\begingroup$ The implied assumption is that spoilers fully deployed vs. partially would noticeably reduce the landing distance for the 737, all else being the same. It would be interesting to test that with real data. It seems plausible. However, I'm guessing braking and thrust reversal have a far greater impact and there's a lot less lift to spoil with the flaps up. $\endgroup$
    – AeroAndy
    Commented Jun 5 at 16:40


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