Originally Posted by A33Zab
Ok, try to formulate it another way.......for what reason could Inertial Data be not available? IR part of ADIRU can operate normal even if ADR is providing unreliable information.
What reason, what reason... would you like a +/- 10,000 ft treshold exceeded for inertial vertical speed? It is always the same reason, a designed parameter exceedance.
A baro inertial loop is integrated in the inertial V/S computation to bring the stability in time of the air data (no drift like inertial data). Degraded data: When the inertial vertical speed is not available, the baro vertical speed is automatically displayed. Failure : In case of vertical speed failure, the scale is replaced by a vertical speed flag.
In case of excessive vertical speed, the digital and analog indications
become amber. Excessive V/S when :
- V/S > 6000 ft/mn or V/S < - 6000 ft/mn,
- V/S < -2000 ft/mn below 2500 ft Radio Altimeter,
- V/S < -1200 ft/mn below 1000 ft Radio Altimeter.
But It looks to be set at +/- 10,000 ft in order to show a degraded status.