Narrative:

I was the PNF conducting descent checklists and approach briefing. We were over fim VOR and cleared for the ILS runway 25 approach to oxr. An MDA of 4000 ft is called for during the feeder route segment on the 112 degree radial from fim. At localizer intercept an MDA of 3600 ft is mandated. Approximately 2 mi from the localizer intercept the PF descended through the MDA of 4000 ft. At 3700 ft ATC alerted us about our altitude. I looked up from the approach plate to see the PF leveling off at 3600 ft. Immediate climb to 4000 ft was commenced. Normal altitude callouts were initiated prior to the excursion, however, the PNF (me) should have been more alert to the aircraft flight path at this low altitude. The approach plate should have been consulted and briefed before our approach began.

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Original NASA ASRS Text

Title: SMT DSNDED BELOW MEA WHILE ON TRANSITION TO AN ILS APCH.

Narrative: I WAS THE PNF CONDUCTING DSCNT CHKLISTS AND APCH BRIEFING. WE WERE OVER FIM VOR AND CLRED FOR THE ILS RWY 25 APCH TO OXR. AN MDA OF 4000 FT IS CALLED FOR DURING THE FEEDER RTE SEGMENT ON THE 112 DEG RADIAL FROM FIM. AT LOC INTERCEPT AN MDA OF 3600 FT IS MANDATED. APPROX 2 MI FROM THE LOC INTERCEPT THE PF DSNDED THROUGH THE MDA OF 4000 FT. AT 3700 FT ATC ALERTED US ABOUT OUR ALT. I LOOKED UP FROM THE APCH PLATE TO SEE THE PF LEVELING OFF AT 3600 FT. IMMEDIATE CLB TO 4000 FT WAS COMMENCED. NORMAL ALT CALLOUTS WERE INITIATED PRIOR TO THE EXCURSION, HOWEVER, THE PNF (ME) SHOULD HAVE BEEN MORE ALERT TO THE ACFT FLT PATH AT THIS LOW ALT. THE APCH PLATE SHOULD HAVE BEEN CONSULTED AND BRIEFED BEFORE OUR APCH BEGAN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.