Gas Turbine Gage for measuring HPCS Actuation. NSN 5220-01-141-8931. GE Part Number 3C3177G01. Ex-military. Excellent condition, with padded hard-shell case. Gage assembly, hpcs actuation ring, igv, st;consists of 2 modified dial indicator gages, 1 is used to measure from the O.D. of the igv and stage 3 actuation ring to the case wear pads and is 2.25 in. dia.-dial gage, 2ND gage consist of A 2.25 in. dia. dial gage;assembled plunger is surrounded by A 3/8 in. O.D. stationary tube that is rigidly attached to the base of the indicator by A standard collet, total range of the gage is in., gages are graduated in 0.001 in. dimensions W/0.100 in. ranged per revolution, both have revolution counters, set master is included for initial setting and periodic calibration. R3B9 13388