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Low energy warning with thrust at idle A320
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26th July 2008 | 14:18
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IFixPlanes
Joined:
Apr 2004
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From:
near EDDF
Quoting out of the AMM:
Low Energy Warning
General
The Low Energy Function is to prevent the A/C from entering a low energy situation by alerting the pilot through an audio warning:
"SPEED...SPEED...SPEED".
Pilot has to increase thrust and low energy warning disappears as soon as:
- Thrust level is high enough or
- Alpha floor protection is triggered or
- Pitch go around mode is triggered.
Low energy warning is available in configuration 2, 3 and FULL and between 100 ft and 2000 ft RA.
Warning
A combination of angle-of-attack, flight-path angle and deceleration is computed and compared to a threshold, depending on slat/flap configuration, typically 0.4 deg. to 1 deg. lower than alpha floor threshold.
When the result of the combination is above this threshold for more than 0.5 sec, low energy condition is triggered for at least 3 sec and sent to the FWC that elaborates the audio warning.
System aspects
The low energy detection is not duplicated.
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