MMHi

Mean maintenance man-hours required for the ith maintenance task (preparation, fault isolation, disassembly, reassembly, etc.)

Ti

average time to perform the ith maintenance task (see Mct definition above)

MPi

Manpower required for the ith maintenance task

K

number of maintenance tasks required (preparation, fault isolation, disassembly, reassembly, etc.)

MMHPREPj

average preparation MMH

MMHISOj

average fault isolation MMH.

MMHD/Rj

average disassembly / reassembly MMH

MMHR/Rj

average MMH of remove / replace (Interchange)

MMHCALj

average calibration MMH.

MMHVERj

average verification MMH

MMHSTj

average start-up MMH

N

number of replaceable items on the next lower level of the product tree.

λj

failure rate of the jth replaceable item

S

ambiguity factor