- ALT DISAGREE Message info:
Notes:
ALT DISAGREE shows when ADIRU left and right altitude disagrees by more than 200 feet for more than five seconds.
ALT DISAGREE Message Possible Causes:Make sure the barometric setting on the Captain and F/O EFIS control panels is the same. Before replacing any component perform BITE if available (CDS-Current Status, ADIRU-Current Status or inflight Faults).
1.ADIRU
2.Pitot or Static ADMs
3.EFIS Control Panel
4.DEU
5.AOA Sensor
6.Static leak or blockage
7.Pitot leak or blockage
8.Water in pitot or static tubing
ALT DISAGREE Flag:
Circuit Breakers:ADIRU Left (AC): P18-1 = E7.
ADIRU Left (DC): P18-1 = E5.
ADIRU Left EXC: P18-2 = E8.
ADIRU Right (AC): P6-1 = C14.
ADIRU Right (DC): P6-1 = C17.
ADIRU Right EXC: P6-1 = C15.
Capt EFIS Control Panel: P18-2 = D1.
F/O EFIS Control Panel: P6-1 = E13.
DEU#1 HOLD UP: P6-1 = D10.
DEU#1 PRIMARY: P18-2 = D5.
DEU#2 HOLD UP: P6-1 = D9.
DEU#2 PRIMARY: P6-1 = D11.
Applicable deferrals None