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“SPEED, SPEED, SPEED” Warning

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“SPEED, SPEED, SPEED” Warning

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Old 5th Mar 2018, 11:28
  #61 (permalink)  
 
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Originally Posted by Dupre
Sorry to seem uninformed, but why is this so clearly the wrong response?

As I can see, you need to add energy into the aircraft... if in thr idle then adding 10kt doesn't achieve the aim, but if you are in speed mode it will give you a boot full of thrust which surly is what you want?
The SPEED SPEED SPEED warning activates just prior to alpha floor autothrust protection. If you don't increase thrust sharpish then the aircraft is going to do it for you! As a general rule when this warning activates it's time to hit TOGA and get out of there.
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Old 5th Mar 2018, 14:26
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As a general rule when this warning activates it's time to hit TOGA and get out of there.
Not necessarily! There are different situations. The first is where ATHR is lagging behind due to turbulence etc. That is where one could use manual thrust to reduce the variations. The second situation where the flight path is shallow with gear and full flaps, high LW. Here the thrust would already be at CLB and only way to check speed reduction is to increase descent. This warning is likely to come in normal circumstances in manual thrust where speed is not properly monitored.
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Old 9th Mar 2018, 08:33
  #63 (permalink)  
 
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Originally Posted by CaptainMongo
Giggit...

The warning has nothing to do with airspeed. It independent of protections. It has nothing to do with VLS, this warning can trigger at any airspeed within its reporting envelope. The warning indicates thrust is limited. If flying AT off, increase thrust, if flying AT on, you must push the TL's past the climb detent.

“A low energy warning alerts pilots when aircraft energy is insufficient to achieve a climbing flight path through pitch control alone. The “SPEED, SPEED, SPEED” voice alert repeats every 5 seconds while the condition exists. Thrust must be increased to achieve a climbing flight path. The low energy warning is computed by the FACs. It is available inconfigurations 2, 3, and FULL and is based on aircraft configuration, airspeed deceleration rate, and flight path angle.”
Only between 100 and 2000'
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