AA777-200 From United States of America, joined Jul 1999, 322 posts, RR: 2 Posted (11 years 8 months 5 days 14 hours ago) and read 2171 times:
I am hoping one of the Mechanics can answer this question for me. Today one of our flights called in range and had a Low Speed Flap Indication message on the EICAS. Exactly what is this? MOC said it should only be a write up but it ended up taking about 80 minutes to fix. I notice that alot of our ERJs get this so its something that is not too uncommon I guess. Any help would be appreciated.
Cdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 1, posted (11 years 8 months 5 days 13 hours ago) and read 2152 times:
Flap Low Speed is an advisory EICAS message which is generated when one of the two flap channels is inoperative. The flaps operate at their low-speed setting when this occurs. Both flap channels failed is NO-GO and would generate a Warning message, the highest level.
The MEL capability is contingent on their being
a). no obstacles in the takeoff flight path above level off and
b). the flap motor and brakes of the failed channel are deactivated.
The dispatch procedure involves gaining access to a wing panel and removing a connector to deactivate the failed channel. Not sure exactly how long this takes. I can't imagine it would take that long. Maybe MOC knew something about this airplane and wanted it fixed before further flight.
AA777-200 From United States of America, joined Jul 1999, 322 posts, RR: 2
Reply 2, posted (11 years 8 months 5 days 12 hours ago) and read 2145 times:
Thanks for the answer. I was watching the mechanic when they came in and he had to tear open a panel on the belly just aft of the wings. I saw him unplug one of the channels and put a bag over the end of it. The funny thing was is that he guessed the wrong one and had to go back in and switch it.
Have a Happy New Year
Erj-145mech From United States of America, joined Oct 2001, 306 posts, RR: 1
Reply 3, posted (11 years 8 months 5 days 8 hours ago) and read 2127 times:
The FECU (Flap Electronic Control Unit), the unit that controls the flap operation is located in the panel 193 fairing, just aft of the trailing edge of the wing below the fuselage skin. The FECU primary function is to prevent split flap conditions, one wing flap extends, and the other doesn't. Parker-Hannifin is the manufacturer of these units, and is in the process of upgrading to help prevent failures. The older units (no mod or mod A status) had a fairly high failure rate.