Nav Adr Disagree
I'm going for a high altitude stall. Flying at night, through very bad weather, slowing down the airspeed because of the turbulence, and then suddenly ice formation that clogges the pitot-static system and causes amongst other failures an ADR DISAGREE:
NAV ADR DISAGREE (A320)
This Topic is relevant to the following aircraft: 2662, 3123, 3304, 3374
If one ADR is faulty, or has been rejected by the ELAC, and if there is a speed or alpha disagrement between the 2 remaining ADRs, alternate law becomes active, and protections are lost.
-AIR SPD X CHECK
IF SPD DISAGREE :
-ADR CHECK PROC APPLY
Refer to the ADR CHECK PROC paper procedure to determine the faulty ADR.
IF NO SPD DISAGREE:
AOA DISCREPANCY
F/CTL ALTN LAW
(PROT LOST) -MAX SPEED 320 KT
STATUS
-MAX SPEED 320 KT
APPR PROC
-FOR LDG USE FLAP 3
Do not select CONF FULL, so as not to degrade handling qualities.
-GPWS LDG FLAP 3 ON
Displayed, when CONF 3 is selected.
APPR SPD VREF + 10
LDG DIST PROC APPLY
Refer to the QRH part 2, or to the FCOM 3.02.80.
ALTN LAW : PROT LOST
WHEN L/G DN : DIRECT LAW
At landing gear extension, control reverts to direct law in pitch, as well as in roll (see DIRECT LAW procedure 3.02.27).
IF NO SPD DISAGREE:
RISK OF UNDUE STALL WARN