Avioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11 Reply 2, posted (6 years 5 months 3 weeks 3 days 1 hour ago) and read 1876 times:
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.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
Avt007 From Canada, joined Jul 2000, 2132 posts, RR: 5 Reply 3, posted (6 years 5 months 3 weeks 2 days 18 hours ago) and read 1785 times:
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.