aircanada333
Posts: 458
Joined: Sun Jun 26, 2005 1:16 pm

I'm Wondering About An Alarm On The RJ.

Sat Jun 16, 2007 3:16 pm

EFIS COMP MON. It appears very often when in the middle of a tow move. What does it mean?

Thanks!
De-icing RULZ!!!
 
DashTrash
Posts: 1266
Joined: Mon Aug 21, 2006 8:44 am

RE: I'm Wondering About An Alarm On The RJ.

Sat Jun 16, 2007 6:31 pm

It's a comparator warning. It means that either the ADIs or HSIs do not agree with each other. (Displaying different attitude or heading information).
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: I'm Wondering About An Alarm On The RJ.

Sun Jun 17, 2007 12:53 am

If we're talking about CRJ's the planes have Collins AHRS and it's extremely sensitive to magnetic disturbances like those caused by a tow vehicle.
6 degrees difference between the two systems gets you a warning.
 Smile
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
avt007
Posts: 1989
Joined: Mon Jul 10, 2000 4:51 am

RE: I'm Wondering About An Alarm On The RJ.

Sun Jun 17, 2007 7:38 am

AC Jazz aircraft are going to an all IRS fleet. The AHRS are a pain, and so is the Litton IRS, so they will have a Honeywell Laseref V in every CRJ, whether 100, 200, or 705. AC333, spefically it means EFIS comparison monitor, meaning that a parameter on the two EFIS displays do not agree. It will be accompanied by an amber box annunciator on the PFDs, next to the parameter that is causing the message. Probably heading, as the two fine gentlemen suggested.
 
aircanada333
Posts: 458
Joined: Sun Jun 26, 2005 1:16 pm

RE: I'm Wondering About An Alarm On The RJ.

Sun Jun 17, 2007 12:29 pm

Thanks guys for the quick answers!
De-icing RULZ!!!

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