  The paper deals with the theoretical investigation of plasmons in weakly
disordered array of quantum wires, consisting of finite number of quantum
wires, arranged at an equal distance from each other. The array of quantum
wires is characterized by the fact that the density of electrons of one
"defect" quantum wire was different from that of other quantum wires. At the
same time it is assumed that "defect" quantum wire can be arranged at an
arbitrary position in array. It is shown that the amount of plasmon modes in
weakly disordered array of quantum wires is equal to the number of quantum
wires in array. The existence of the local plasmon mode, whose properties
differ from those of usual modes, is found. We point out that the local plasmon
mode spectrum is slightly sensitive to the position of "defect" quantum wire in
the array. At the same time the spectrum of usual plasmon modes is shown to be
very sensitive to the position of "defect" quantum wire.
