EMB190 Erroneous Radio Altimeter Indications

[clarkieboy]

Hi,
Not just the L/H, can happen occasionally with the R/H. Happens a lot, usually rapid fluctuations around the 760 ft mark, after power up.
Various theories, including reflections off the painted lines, especially in the wet.
Nobody worries about it, the crews are used to it. It usually stops after a while. never happens in flight.
Hope that helps.
Cheers!
From the FIM :
NOTE Objects (for example: tools, tool carts/boxes, stairs, drainage grates, pipes, metal covers on the ground, etc.) or structures near the Rad Alt antennas can cause the Rad Alt system to oscillate and show values different from 0 ft with the aircraft on the ground..

NOTE:Objects (for example: tools, tool carts/boxes, stairs, drainage grates, pipes, metal covers onthe ground, etc.) or structures near the Rad Alt antennas can cause the Rad Alt system tooscillate and show values different from 0 ft with the aircraft on the ground.FAULT ISOLATIONMANUALEmbraer 195 - FIM 321134-31-00810-813-A/200Page 2 of 17Rev 49 - Jul 22/22Copyright © by Embraer S.A. All rights reserved - See title page for details.