Started in 1994 the L3 experiment has been equipped with a forward-backward
muon spectrometer triggered by an RPC system. Made of 192 double-gay RPCs,
it has been working for six years in streamer mode and it will continue to
run at least one year more. We monitored the behaviour of the system durin
g the L3 run periods and in this paper we report on its present status and
long-term performance. (C) 2000 Elsevier Science B.V. All rights reserved.