2010-10 · NASA ASRS report 916181
A CE-750 mis-set altimeter by exactly 1' descending through the transition altitude and descended 1;000 FT below their cleared altitude during the arrival to BFI.
I was the pilot flying as First Officer when the Captain went off frequency to get ATIS. He then returned and we continued our descent on the OLM6 arrival into BFI. We were told to descend to 10;000 FT and cancel the 12;000/250 KTS crossing restriction at ARVAD. We continued down to 10;000 FT and at FOURT we turned to a heading of 340 degrees for vectors to the ILS 13R into BFI. Once on the heading of 340 degrees Approach asked us what our altitude was. We reported back that it was 10;000 FT. He told us our altitude was showing 9;000 FT. A 1;000 FT deviation. We then requested the correct altimeter setting. We realized our error was the incorrect altimeter setting. He then gave us a descent to 4;000 for which we corrected the altimeter and leveled off at the correct altitude of 4;000 FT with the correct altimeter setting.All checklists were followed on descent and I don't know how we had set the wrong altimeter setting. We were on seven hours of flying; icing was reported and I was concentrating on flying the airplane; watching for ice and following the altitude and speed restrictions on the arrival. I really need to pay attention to what the current altimeter is and not rely on the other pilot to hear/set the correct altimeter during our transition checklist. I had a print out of the weather which was 2 hours old; and it would have been a great resource if I had checked it. I didn't think about the altimeter setting being that far off on altitude.
ATIS was received and recorded on the flight log local altimeter setting was 29.35. During the transition phase and checklist 30.35 was set instead of 29.35. Approach asked us why we had descended to 9;000 FT; we were indicating the cleared altitude of 10;000 FT.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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