Narrative:

Back course localizer approach to boi. We were at 9000 ft and picked up boi ATIS prior to handoff with boi approach and it stated to expect ILS runway 10R approach which we set up and briefed. When handed over to approach, they stated 'expect back course localizer runway 28L approach' and immediately said 'descend to 6500 ft, turn to 230 degrees, cleared back course localizer runway 28L approach.' we hurried to reset the FMS and check next altitude and reset the front course on the CDI, then I armed the approach and looked down to review and check and set new MDA and stepdown altitudes and the first officer ran the checklist, at which time he called localizer alive, xchk. Seconds later, he said aircraft turning wrong way, so I hit heading mode and turned back to reintercept the localizer. I rearmed the flight director. I looked down again, and first officer said aircraft turning to the right, at which time he disconnected the autoplt added climb thrust and started a turn to the left. While in the climbing turn, we heard 'terrain, whoop, whoop, pull up' at which time I went to maximum thrust and retracted the flight spoilers. We leveled at 7000 ft at which time I took over and hand flew the rest of the approach to touchdown. We should have asked for a vector so we could have set up for the new approach and not be hurried. In my hurried state of mind, I inadvertently pushed an additional flight director button while arming the system that I would have not normally done, which caused the aircraft to turn the wrong way. Having more set-up time would have prevented this. Prior to being handed off to boi approach we were at 9000 ft with ZLC. We got the ATIS and it stated that boi was using ILS runway 10R. We set up and briefed for that approach. When handed off to boi approach, they told us to 'descend to 6500 ft, turn left to 230 degrees, cleared for back course runway 28L approach.' we were approximately 30 NM out. We hurried to reset the FMS and check transition altitude and set reciprocal inbound course. In my rush and instinct, I armed the approach by selecting back course and navigation mode on the flight control panel. After that, I looked back down to confirm stepdown altitudes and set in new MDA. The first officer said localizer alive and was running checklist. The first officer then stated that the aircraft was turning the wrong direction, so I went to heading mode and started a turn back to 230 degrees to intercept. Again, I armed the flight director. I looked down to confirm our descent altitude and first officer said that aircraft turned right again, at which time he said my aircraft then disconnected the autoplt, went to climb thrust, and turned back reintercept. At that point the egpws went off 'terrain, terrain, pull up,' at which time I added maximum thrust and retracted the flight spoilers. Once the aircraft was level at 7000 ft and back on heading, I said 'my aircraft' and then I hand flew the remainder of the approach. ATC asked us if we would like the VOR approach and we said we could continue with the back course. We landed without any other problems. We should have asked for vectors so we could set up for the new approach and not be so rushed. Boi approach has a habit of slam-dunking at the last min.

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Original NASA ASRS Text

Title: E145 CREW MISSET THE FGS FOR THE LOC BACK COURSE RWY 28L APCH AT BOI AFTER THEY WERE GIVEN A LAST SECOND RWY CHANGE. THE EGPWS 'TERRAIN' WARNING SOUNDED AS THE ACFT TURNED TOWARD HIGH TERRAIN.

Narrative: BACK COURSE LOC APCH TO BOI. WE WERE AT 9000 FT AND PICKED UP BOI ATIS PRIOR TO HDOF WITH BOI APCH AND IT STATED TO EXPECT ILS RWY 10R APCH WHICH WE SET UP AND BRIEFED. WHEN HANDED OVER TO APCH, THEY STATED 'EXPECT BACK COURSE LOC RWY 28L APCH' AND IMMEDIATELY SAID 'DSND TO 6500 FT, TURN TO 230 DEGS, CLRED BACK COURSE LOC RWY 28L APCH.' WE HURRIED TO RESET THE FMS AND CHK NEXT ALT AND RESET THE FRONT COURSE ON THE CDI, THEN I ARMED THE APCH AND LOOKED DOWN TO REVIEW AND CHK AND SET NEW MDA AND STEPDOWN ALTS AND THE FO RAN THE CHKLIST, AT WHICH TIME HE CALLED LOC ALIVE, XCHK. SECONDS LATER, HE SAID ACFT TURNING WRONG WAY, SO I HIT HDG MODE AND TURNED BACK TO REINTERCEPT THE LOC. I REARMED THE FLT DIRECTOR. I LOOKED DOWN AGAIN, AND FO SAID ACFT TURNING TO THE R, AT WHICH TIME HE DISCONNECTED THE AUTOPLT ADDED CLB THRUST AND STARTED A TURN TO THE L. WHILE IN THE CLBING TURN, WE HEARD 'TERRAIN, WHOOP, WHOOP, PULL UP' AT WHICH TIME I WENT TO MAX THRUST AND RETRACTED THE FLT SPOILERS. WE LEVELED AT 7000 FT AT WHICH TIME I TOOK OVER AND HAND FLEW THE REST OF THE APCH TO TOUCHDOWN. WE SHOULD HAVE ASKED FOR A VECTOR SO WE COULD HAVE SET UP FOR THE NEW APCH AND NOT BE HURRIED. IN MY HURRIED STATE OF MIND, I INADVERTENTLY PUSHED AN ADDITIONAL FLT DIRECTOR BUTTON WHILE ARMING THE SYS THAT I WOULD HAVE NOT NORMALLY DONE, WHICH CAUSED THE ACFT TO TURN THE WRONG WAY. HAVING MORE SET-UP TIME WOULD HAVE PREVENTED THIS. PRIOR TO BEING HANDED OFF TO BOI APCH WE WERE AT 9000 FT WITH ZLC. WE GOT THE ATIS AND IT STATED THAT BOI WAS USING ILS RWY 10R. WE SET UP AND BRIEFED FOR THAT APCH. WHEN HANDED OFF TO BOI APCH, THEY TOLD US TO 'DSND TO 6500 FT, TURN L TO 230 DEGS, CLRED FOR BACK COURSE RWY 28L APCH.' WE WERE APPROX 30 NM OUT. WE HURRIED TO RESET THE FMS AND CHK TRANSITION ALT AND SET RECIPROCAL INBOUND COURSE. IN MY RUSH AND INSTINCT, I ARMED THE APCH BY SELECTING BACK COURSE AND NAV MODE ON THE FLT CTL PANEL. AFTER THAT, I LOOKED BACK DOWN TO CONFIRM STEPDOWN ALTS AND SET IN NEW MDA. THE FO SAID LOC ALIVE AND WAS RUNNING CHKLIST. THE FO THEN STATED THAT THE ACFT WAS TURNING THE WRONG DIRECTION, SO I WENT TO HDG MODE AND STARTED A TURN BACK TO 230 DEGS TO INTERCEPT. AGAIN, I ARMED THE FLT DIRECTOR. I LOOKED DOWN TO CONFIRM OUR DSCNT ALT AND FO SAID THAT ACFT TURNED R AGAIN, AT WHICH TIME HE SAID MY ACFT THEN DISCONNECTED THE AUTOPLT, WENT TO CLB THRUST, AND TURNED BACK REINTERCEPT. AT THAT POINT THE EGPWS WENT OFF 'TERRAIN, TERRAIN, PULL UP,' AT WHICH TIME I ADDED MAX THRUST AND RETRACTED THE FLT SPOILERS. ONCE THE ACFT WAS LEVEL AT 7000 FT AND BACK ON HDG, I SAID 'MY ACFT' AND THEN I HAND FLEW THE REMAINDER OF THE APCH. ATC ASKED US IF WE WOULD LIKE THE VOR APCH AND WE SAID WE COULD CONTINUE WITH THE BACK COURSE. WE LANDED WITHOUT ANY OTHER PROBS. WE SHOULD HAVE ASKED FOR VECTORS SO WE COULD SET UP FOR THE NEW APCH AND NOT BE SO RUSHED. BOI APCH HAS A HABIT OF SLAM-DUNKING AT THE LAST MIN.

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.