4 19 6 ish unknown IS1 IS2 IS3 IS4 ISCLOCKRUNNING Normal Restricted IT1 IT2 IT3 IT4 IMCURRENTTIME IMRATEFACTOR IH1 Head 1 IH2 Head 2 IH3 Head 3 IH4 Head 4 IF$vsm:AAR-1946:PL-2-high($0001) Mast 1 IF$vsm:AAR-1946:PL-2-high($0002) Mast 2 IF$vsm:AAR-1946:PL-2-high($0003) Mast 3 IF$vsm:AAR-1946:PL-2-high($0004) Mast 4 500 Mast 1 Mast 2 Comment on 1 - 2 yes no no no no no IT2 closed IT3 thrown IT4 thrown IS2 inActive IS3 active Mast 3 Advance Approach