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737NG - Go Around bugged MAGENTA speed?

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737NG - Go Around bugged MAGENTA speed?

Old 22nd May 2020, 09:02
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Join Date: May 2020
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737NG - Go Around bugged MAGENTA speed?

Brand new to type..... Sorry
After electing to go around, pressing TOGA, and calling for flaps 15, I am slightly unclear how / what the FMC is subsequently displaying as the magenta speed. It (obviously!) is always be a higher speed than the manoeuvring speed for flaps 5 and flap 1. I never approach that speed until clean and bugging up.

But what is it in the initial flap 15, 15 degrees stable climb??? Hope that makes sense!
AirbusBoeing1974 is offline  
Old 22nd May 2020, 16:54
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Target speed in TO/GA mode is flap manuevering speed for next flap setting at MTOW, e.g. with flaps 15, it will give you flaps 5 manuevering speed at MTOW.

Last edited by FlyingStone; 22nd May 2020 at 20:59.
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Old 22nd May 2020, 20:54
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Almost, bugged speed is commanded to the MTOM manoeuvring speed for the selected flap e.g. you select TOGA and F15, the magenta bug moves to the F15 manoeuvring speed (at MTOM).

It’s worth noting this speed may not be what you expect, the MTOM used to calculate this speed is set in the FMC by the operator and may not be the same as the MTOM used on the line (many airlines artificially reduce the MTOM to avoid Nav charges for heavier aircraft but the FMC MAY have the structural limit MTOM).



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Old 27th May 2020, 12:17
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Thanks. That makes sense. A TRI on course recently confessed not knowing and stated it might be manoeuvring speed for NEXT stage of flap but Im not sure. So overspeeding the flaps would take some effort.
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