Narrative:

During approach to runway 10L at billings; the runway was changed to runway 28. This placed our aircraft high and fast for the approach. In an effort to get the aircraft down and slowed; the captain asked for a vector; which was received. We were then vectored back to a dog-leg; 3 miles outside the marker. The aircraft was still high and was not configured. We were given a descent to 5300 ft and a turn to intercept the localizer. During this maneuver; the first officer; an IOE student; lost situational awareness of his descent rate and the fact that he had the speed brakes deployed. I informed him that he was about to descend below 5300 ft. As we descended through 5500 ft; the captain took the airplane and recovered at 5100 ft. At this point; we received a GPWS 'whoop whoop terrain' warning and were forced to execute an escape maneuver. This resulted in a climb to 7000' MSL. We informed approach; who asked us to stop climb at 6000 ft MSL. We were already nose high passing 6600 ft at the time; which we communicated to approach control. Due to our altitude and an impending conflict with other traffic; we were told to turn north and 'expedite' the turn. We complied and then were vectored back around for another; uneventful approach.

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Original NASA ASRS Text

Title: B727 CREW DSNDS BELOW ASSIGNED ALT ON APCH TO BIL AFTER RWY CHANGE. GPWS WARNING OCCURS AND CREW PERFORMS AN ESCAPE MANEUVER.

Narrative: DURING APCH TO RWY 10L AT BILLINGS; THE RWY WAS CHANGED TO RWY 28. THIS PLACED OUR ACFT HIGH AND FAST FOR THE APCH. IN AN EFFORT TO GET THE ACFT DOWN AND SLOWED; THE CAPT ASKED FOR A VECTOR; WHICH WAS RECEIVED. WE WERE THEN VECTORED BACK TO A DOG-LEG; 3 MILES OUTSIDE THE MARKER. THE ACFT WAS STILL HIGH AND WAS NOT CONFIGURED. WE WERE GIVEN A DSCNT TO 5300 FT AND A TURN TO INTERCEPT THE LOCALIZER. DURING THIS MANEUVER; THE FO; AN IOE STUDENT; LOST SITUATIONAL AWARENESS OF HIS DSCNT RATE AND THE FACT THAT HE HAD THE SPD BRAKES DEPLOYED. I INFORMED HIM THAT HE WAS ABOUT TO DSND BELOW 5300 FT. AS WE DSNDED THROUGH 5500 FT; THE CAPT TOOK THE AIRPLANE AND RECOVERED AT 5100 FT. AT THIS POINT; WE RECEIVED A GPWS 'WHOOP WHOOP TERRAIN' WARNING AND WERE FORCED TO EXECUTE AN ESCAPE MANEUVER. THIS RESULTED IN A CLB TO 7000' MSL. WE INFORMED APCH; WHO ASKED US TO STOP CLB AT 6000 FT MSL. WE WERE ALREADY NOSE HIGH PASSING 6600 FT AT THE TIME; WHICH WE COMMUNICATED TO APCH CTL. DUE TO OUR ALT AND AN IMPENDING CONFLICT WITH OTHER TFC; WE WERE TOLD TO TURN NORTH AND 'EXPEDITE' THE TURN. WE COMPLIED AND THEN WERE VECTORED BACK AROUND FOR ANOTHER; UNEVENTFUL APCH.

Data retrieved from NASA's ASRS site as of January 2009 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.