Narrative:

On the approach to mtn talking to potomac approach; I received ATIS information and runway 15 in use. Potomac approach asked if we could accept runway 33 and we acknowledged that we could. The controller was also in contact with a military aircraft approximately 5 miles in trail for the same airport and advised us to keep our speed up and cleared us direct to the airport. Approximately 7 miles south of the field; we called the field in sight and we were cleared for the visual approach to runway 33 and contact the tower. No frequency was given so I had to look it up quickly. The PIC acknowledged he had the airport; but did not commence a descent right away and we were level at 3;000 feet and 200 KTS. As I was looking up the tower frequency heads down; 'traffic' alert sound from the TCAS. I glanced up to the mfd and saw a target 11 o'clock same altitude; moments later we had an RA alert to descend. The PIC flying did not respond to the RA command and I pushed the yoke to commence an immediate descent. The [military aircraft] passed over us between 200-300 feet. I contacted the tower and realized the PIC had overflown the final approach course. We requested runway 15 and entered a downwind for; but was requested if we could still land runway 33 due to military requirements. We made a 180 and entered a right base for runway 33 and landed with no further incident.

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Original NASA ASRS Text

Title: CJ-3 First Officer reported an NMAC on approach to MTN when the flying pilot failed to descend on the glide slope as cleared.

Narrative: On the approach to MTN talking to Potomac Approach; I received ATIS information and Runway 15 in use. Potomac Approach asked if we could accept Runway 33 and we acknowledged that we could. The controller was also in contact with a military aircraft approximately 5 miles in trail for the same airport and advised us to keep our speed up and cleared us direct to the airport. Approximately 7 miles south of the field; we called the field in sight and we were cleared for the visual approach to Runway 33 and contact the Tower. No frequency was given so I had to look it up quickly. The PIC acknowledged he had the airport; but did not commence a descent right away and we were level at 3;000 feet and 200 KTS. As I was looking up the tower frequency heads down; 'traffic' alert sound from the TCAS. I glanced up to the MFD and saw a target 11 o'clock same altitude; moments later we had an RA alert to descend. The PIC flying did not respond to the RA command and I pushed the yoke to commence an immediate descent. The [military aircraft] passed over us between 200-300 feet. I contacted the Tower and realized the PIC had overflown the final approach course. We requested Runway 15 and entered a downwind for; but was requested if we could still land runway 33 due to military requirements. We made a 180 and entered a right base for Runway 33 and landed with no further incident.

Data retrieved from NASA's ASRS site 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.