Narrative:

We had an ATC clearance to descend from approximately FL220 to 10000 ft in about 2 mins. I was concentrating on the descent, bringing back all power, putting out full air brakes and ensuring airspeed was as high as possible without overspding. I reached 10000 ft and leveled off. ATC told us to climb to our assigned altitude of 10000 ft which was exactly where I was. We told him 'level at 10000 ft' and he said check altimeter. I had forgotten the transition check at FL180 and thus forgot to reset the altimeter. Furthermore, the altimeter setting given to us on the descent was 29.72 and it should have been 29.53. A min later we were asked which radial we were on to smo. We replied the 262 degree radial. He assigned us a heading and then again asked us which radial. We told him which radial and also said we were assigned heading. The winds were strong that day, so he reassigned a new heading. Altimeter setting was a big factor in this case. You definitely need the accurate altimeter setting and it is imperative through your transition altitude. Also, not so much concentration on reaching a crossing restr. Perhaps situation would have been better to let ATC know we were unable to make that quick a descent and therefore would have probably not been as likely to overlook the transition check. Supplemental information from acn 361728: both the first officer and I were surprised we had missed the transition check. I even more so since I normally read back the altimeter setting to the PF during the descent. It pays to be even more diligent with crews that are accustomed to flying together a lot.

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Original NASA ASRS Text

Title: HS25 FLC DEV. ALTDEV ALT OVERSHOT. WRONG ALTIMETER SETTING, HAD QNE INSTEAD OF QNH. MISSED ALTIMETER SETTING PROC AT FL180.

Narrative: WE HAD AN ATC CLRNC TO DSND FROM APPROX FL220 TO 10000 FT IN ABOUT 2 MINS. I WAS CONCENTRATING ON THE DSCNT, BRINGING BACK ALL PWR, PUTTING OUT FULL AIR BRAKES AND ENSURING AIRSPD WAS AS HIGH AS POSSIBLE WITHOUT OVERSPDING. I REACHED 10000 FT AND LEVELED OFF. ATC TOLD US TO CLB TO OUR ASSIGNED ALT OF 10000 FT WHICH WAS EXACTLY WHERE I WAS. WE TOLD HIM 'LEVEL AT 10000 FT' AND HE SAID CHK ALTIMETER. I HAD FORGOTTEN THE TRANSITION CHK AT FL180 AND THUS FORGOT TO RESET THE ALTIMETER. FURTHERMORE, THE ALTIMETER SETTING GIVEN TO US ON THE DSCNT WAS 29.72 AND IT SHOULD HAVE BEEN 29.53. A MIN LATER WE WERE ASKED WHICH RADIAL WE WERE ON TO SMO. WE REPLIED THE 262 DEG RADIAL. HE ASSIGNED US A HDG AND THEN AGAIN ASKED US WHICH RADIAL. WE TOLD HIM WHICH RADIAL AND ALSO SAID WE WERE ASSIGNED HDG. THE WINDS WERE STRONG THAT DAY, SO HE REASSIGNED A NEW HDG. ALTIMETER SETTING WAS A BIG FACTOR IN THIS CASE. YOU DEFINITELY NEED THE ACCURATE ALTIMETER SETTING AND IT IS IMPERATIVE THROUGH YOUR TRANSITION ALT. ALSO, NOT SO MUCH CONCENTRATION ON REACHING A XING RESTR. PERHAPS SIT WOULD HAVE BEEN BETTER TO LET ATC KNOW WE WERE UNABLE TO MAKE THAT QUICK A DSCNT AND THEREFORE WOULD HAVE PROBABLY NOT BEEN AS LIKELY TO OVERLOOK THE TRANSITION CHK. SUPPLEMENTAL INFO FROM ACN 361728: BOTH THE FO AND I WERE SURPRISED WE HAD MISSED THE TRANSITION CHK. I EVEN MORE SO SINCE I NORMALLY READ BACK THE ALTIMETER SETTING TO THE PF DURING THE DSCNT. IT PAYS TO BE EVEN MORE DILIGENT WITH CREWS THAT ARE ACCUSTOMED TO FLYING TOGETHER A LOT.

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.