OPERATIONS MANUAL

Warning Systems
EICAS Messages: (continued)
Takeoff phase warning inhibit
This feature inhibits EICAS warnings during the critical phase of the takeoff.
When the FMC provides a valid V1 speed, the takeoff phase warning inhibit
begins when these two conditions are true:
+ Takeoff alert is enabled
+ ADC computed IAS is valid and greater than V1
When V1 is invalid, the takeoff phase warning inhibit begins when these two
conditions are true:
+ Takeoff alert is enabled
+ IRS pitch attitude is valid and above 5°
Once the takeoff phase warning inhibit has begun, it remains on until either
of these conditions is true:
• 25 seconds have passed since the beginning of the warning inhibit
• Radio altimeter L or R is operative and RA is above 400 ft
Takeoff phase caution inhibit
The takeoff phase caution inhibit deactivates the beeper and the master
caution lights.
The takeoff phase caution inhibit begins when these two conditions are true:
+ Radio altimeters L & R are inoperative or RA is below 400 ft
+ ADC computed IAS is valid and rises through 80 kt
The takeoff phase caution inhibit ends when any of these conditions is true:
• 20 seconds have passed since the IRS pitch attitude rotated through 5°
• Radio altimeter L or R is operative and RA is above 400 ft
• ADC computed IAS is valid and below 75 kt
• ADC computed IAS is invalid
The beeper will sound and the caution lights will illuminate when the takeoff
phase caution inhibit ends while a caution message already exists.
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