Notation

Description

Ranges

$T_{PM}$

PM interval (hrs.)

250 - 750

${\eta }_{rpl}$

Replace utilization (%)

20 - 48

${\eta }_{rpr}$

Repair utilization (%)

25 - 51

$L_{E_d}$

Number of Day shift engineers

1 - 3

$L_{E_n}$

Number of Nightshift engineers

1 - 3

$L_{T_d}$

Number of Day shift technicians

1 - 3

$L_{T_n}$

Number of Nightshift technicians

1 - 3