ALTDEV ALT EXCURSION ALT XING RESTR NOT MET WHEN DC9 FLC MISREADS APCH CHART DURING IAP ILS LOC APCH. GS INOP.

Narrative

FLT FROM ORF-DTW. FO FLYING APCH ILS RWY 21L DTW WITH GS OTS. FO HAD LOC DIALED IN FOR APCH RADIO. I USED SVM VOR TO IDENT POS ON LOC. ATC VECTORED US TO INTERCEPT LOC AT 5000 FT; CLRED FOR APCH. FO INTERCEPTED LOC AND I DETERMINED WE WERE INSIDE OF THE SVM 085 DEG RADIAL. I THEN DIALED IN THE SVM 117 DEG RADIAL AND TURNED ON MARKER BEACON SWITCH TO IDENT THE SCOFI FINAL APCH FIX. THIS IS WHERE THE PROB WAS. THE STEPDOWN FIXES; ROBBI; BALAS; NESBI ARE SUPPOSED TO BE IDENTED FROM CRL VOR DME. I WAS USING SVM VOR. UNFORTUNATELY THE DME FOR SVM VOR DOES CORRESPOND TO THE DME'S FOR THE STEPDOWN FIXES. THIS GOT US DOWN TO THE XING ALTS EARLY. WHEN WE GOT TO 2600 FT MSL; ASSUMING WE WERE ABOUT TO CROSS FINAL FIX OF SCOFI; ATC ADVISED US TO CHK OUR ALT. ABOUT SAME TIME WE NOTICED THAT DME FIX TO CROSS SCOFI AND SVM RADIAL 117 DEGS DIDN'T CORRESPOND. WE CLBED TO 3000 FT MSL. WE HAD SLOWED TO APCH SPD SINCE WE THOUGHT WE WERE ABOUT TO CROSS FINAL FIX FOR TIMING. ATC THEN PULLED US OUT OF THE APCH LINE BECAUSE THERE WERE OTHER PLANES BEHIND US. CONTRIBUTING FACTORS: SHORT OVERNIGHT IN ORF AND EACH EAST COAST DEP; SO DIFFERENT TIME ZONE (FATIGUE). COMPANY POLICY OF FULL APCH BRIEF IF WX IS LESS THAN 2000 FT AND 5 MI VISIBILITY (ATIS WX 2500 FT AND 10 MI) WHILE ON APCH WX THEN RPTED 1600 FT AND 10 MI. CONFUSION WITH SVM RADIAL ON APCH CHART. IF WE HAD DONE A FULL APCH BRIEF WE WOULD HAVE PROBABLY CAUGHT THE STEPDOWN FIXES SHOULD HAVE BEEN OFF OF CRL VOR. CORRECTIVE ACTIONS: ELIMINATE SVM RADIALS FROM APCH CHART AND USE DXO VOR DME TO IDENT STEPDOWN FIXES; SINCE IT IS LOCATED AT DTW ARPT AND BETTER REF FOR DISTANCE FROM ARPT.