Thread: AF447
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Old 5th Jun 2009, 06:18   #58 (permalink)
Nero1352


Probationary PPRuNer
 
Join Date: Apr 2009
Location: Europe
Posts: 3
The sequence of ACARS messages shows at 0212 an ADR disagree message.
This massage does not say anything about the number of ADRs that disagreed. Under many conditions the system cannot isolate the faulty ADR. The consequences would be that many systems that rely on inputs from the ADR will show faults (TCAS, Cabin Pressurization Control)) or disengage (AP,ATHR) and the F/CTL system would revert to a degraded mode.
The crew has to find out which indication they can trust and what action to follow. The Airbus 330 OM-B gives an extensiv description of the problems under the title "MISC Unreliable speed indication/ADR Check"

Posible reason for the ADR disagree: damage to the radom by lightning or hail.
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