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B737 flight crew level off 1000 ft low with the wrong altimeter setting on descent into ord.
| Attributes | |
| ACN | 689978 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 190 flight time total : 17000 flight time type : 3000 |
| ASRS Report | 689978 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 18000 flight time type : 6000 |
| ASRS Report | 690045 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : company policies non adherence : far |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Descending on vector into ord on the kokomo 1 arrival. Vector to bearz intersection. Had been given a descent to 11000 ft MSL. Altimeter setting was low at 29.24. Company procedures out of FL180 is to do preliminary checklist where the approach is briefed and altimeters; airspeed bugs; autobrakes; etc; are set. Because we hadn't received a runway yet; we delayed the checklist. We had done the items via cockpit flow patterns but no briefing or reading of the checklist was accomplished. Captain had set 29.34; but first officer who was flying; set 30.24 by error. Captain nor first officer caught this error. First officer leveled off at 11000 ft but in reality we were at 10000 ft. Our altitude alerter never went off to remind us since it was tied to the first officer's flight director. Everything looked normal. Captain was not paying close enough attention and all looked normal. We were 1000 ft low. Center questioned our altitude; and there was confusion at first. Who was right? Why had the altitude alerter not gone off. Discovering our altimeter discrepancy; we went back up to 11000 ft with the correct altimeter set in both altimeters. No conflicts were mentioned. We overlooked company procedures at FL180 regardless if you know the approach. Good lesson learned and won't be complacent again.
Original NASA ASRS Text
Title: B737 FLT CREW LEVEL OFF 1000 FT LOW WITH THE WRONG ALTIMETER SETTING ON DSCNT INTO ORD.
Narrative: DSNDING ON VECTOR INTO ORD ON THE KOKOMO 1 ARR. VECTOR TO BEARZ INTXN. HAD BEEN GIVEN A DSCNT TO 11000 FT MSL. ALTIMETER SETTING WAS LOW AT 29.24. COMPANY PROCS OUT OF FL180 IS TO DO PRELIMINARY CHKLIST WHERE THE APCH IS BRIEFED AND ALTIMETERS; AIRSPD BUGS; AUTOBRAKES; ETC; ARE SET. BECAUSE WE HADN'T RECEIVED A RWY YET; WE DELAYED THE CHKLIST. WE HAD DONE THE ITEMS VIA COCKPIT FLOW PATTERNS BUT NO BRIEFING OR READING OF THE CHKLIST WAS ACCOMPLISHED. CAPT HAD SET 29.34; BUT FO WHO WAS FLYING; SET 30.24 BY ERROR. CAPT NOR FO CAUGHT THIS ERROR. FO LEVELED OFF AT 11000 FT BUT IN REALITY WE WERE AT 10000 FT. OUR ALT ALERTER NEVER WENT OFF TO REMIND US SINCE IT WAS TIED TO THE FO'S FLT DIRECTOR. EVERYTHING LOOKED NORMAL. CAPT WAS NOT PAYING CLOSE ENOUGH ATTN AND ALL LOOKED NORMAL. WE WERE 1000 FT LOW. CTR QUESTIONED OUR ALT; AND THERE WAS CONFUSION AT FIRST. WHO WAS RIGHT? WHY HAD THE ALT ALERTER NOT GONE OFF. DISCOVERING OUR ALTIMETER DISCREPANCY; WE WENT BACK UP TO 11000 FT WITH THE CORRECT ALTIMETER SET IN BOTH ALTIMETERS. NO CONFLICTS WERE MENTIONED. WE OVERLOOKED COMPANY PROCS AT FL180 REGARDLESS IF YOU KNOW THE APCH. GOOD LESSON LEARNED AND WON'T BE COMPLACENT AGAIN.
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.