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Flight crew of B737-400 undershot their arrival descent by 500 ft due to forgetting to change the altimeter descending through FL180.
| Attributes | |
| ACN | 451750 |
| Time | |
| Date | 199910 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : olm.vortac |
| State Reference | WA |
| Altitude | msl bound lower : 12000 msl bound upper : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : intermediate altitude descent : vacating altitude |
| Route In Use | arrival star : olm.olm2 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 230 flight time total : 8000 flight time type : 3800 |
| ASRS Report | 451750 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 240 flight time total : 12000 flight time type : 3400 |
| ASRS Report | 452197 |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance non adherence other |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The captain was flying the olympia two arrival into seatac airport, wa. He was cleared to cross olm at 250 KTS at 12000 ft for the olympia two arrival north arrival into seattle. Due to preoccupation of briefing, the altimeter was not changed from 29.92 to 30.14 and the checklist that encompasses the altimeter change was accomplished late. ATC did not query the temporary altitude leveloff and the altimeters were set to the proper setting at 30.14 and all checklists accomplished. The episode could have been avoided by calling for the checklist at the proper phase of flight and to intercept the briefing to ensure that the checklist were accomplished.
Original NASA ASRS Text
Title: FLC OF B737-400 UNDERSHOT THEIR ARR DSCNT BY 500 FT DUE TO FORGETTING TO CHANGE THE ALTIMETER DSNDING THROUGH FL180.
Narrative: THE CAPT WAS FLYING THE OLYMPIA TWO ARR INTO SEATAC ARPT, WA. HE WAS CLRED TO CROSS OLM AT 250 KTS AT 12000 FT FOR THE OLYMPIA TWO ARR N ARR INTO SEATTLE. DUE TO PREOCCUPATION OF BRIEFING, THE ALTIMETER WAS NOT CHANGED FROM 29.92 TO 30.14 AND THE CHKLIST THAT ENCOMPASSES THE ALTIMETER CHANGE WAS ACCOMPLISHED LATE. ATC DID NOT QUERY THE TEMPORARY ALT LEVELOFF AND THE ALTIMETERS WERE SET TO THE PROPER SETTING AT 30.14 AND ALL CHKLISTS ACCOMPLISHED. THE EPISODE COULD HAVE BEEN AVOIDED BY CALLING FOR THE CHKLIST AT THE PROPER PHASE OF FLT AND TO INTERCEPT THE BRIEFING TO ENSURE THAT THE CHKLIST WERE ACCOMPLISHED.
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.