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737 FMC Stab Trim & VREF for all flaps up.

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737 FMC Stab Trim & VREF for all flaps up.

Old 23rd Feb 2023, 09:20
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737 FMC Stab Trim & VREF for all flaps up.

Why does the calculated STAB trim ball reduce by 1.0 unit around 77 knots during the T/O Roll with no movement on the stabiliser wheel. ?

Why do we fly at VREF40 + 55 for "All Flaps up landing"?
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Old 26th Feb 2023, 21:13
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You're back on the 737 now? I thought you'd gone to the Bus...
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Old 26th Feb 2023, 22:56
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1. Do you mean the stab trim value in the FMC? Never noticed that.

2. That's what Boeing's engineers and test pilots came up with and it assures a safe approach can be flown to a landing.
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Old 28th Feb 2023, 12:42
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Originally Posted by Amadis of Gaul
You're back on the 737 now? I thought you'd gone to the Bus...

Always have been on the 737. Reading the A320 manuals as well.
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