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Medium large transport crew misset their altimeter by 1 inch. This resulted in the aircraft being 1000 ft low.
| Attributes | |
| ACN | 419441 |
| Time | |
| Date | 199811 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : msp |
| State Reference | MN |
| Altitude | msl bound lower : 3000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 1500 |
| ASRS Report | 419441 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
On approach into msp, we set altimeters to 29.58 passing FL180 on arrival. When turned on final for the ILS runway 12R approach, GS captured as did the localizer. We intercepted the final approach 14 mi out. At that time, when I xrefed the GS intercept with the altimeter, I questioned myself that the altimeter seemed to read high. As we approached the OM, I asked the captain to verify the altimeter setting. He did, and we had to reset the altimeters to 28.58. Our altimeters were reading 1000 ft high though we were on the GS. The altimeter had dropped significantly since our previous arrival the evening before and at 28.58 was abnormally low, thus 29.58 seemed a more appropriate setting. We set the altimeters to what seemed normal, whereas 28.58 is exceptionally low. ATC never asked about our altitude nor did they question our altimeter setting. It was the xrefing once the GS was captured with other instruments that made me aware of the error in altimeter setting.
Original NASA ASRS Text
Title: MLG CREW MISSET THEIR ALTIMETER BY 1 INCH. THIS RESULTED IN THE ACFT BEING 1000 FT LOW.
Narrative: ON APCH INTO MSP, WE SET ALTIMETERS TO 29.58 PASSING FL180 ON ARR. WHEN TURNED ON FINAL FOR THE ILS RWY 12R APCH, GS CAPTURED AS DID THE LOC. WE INTERCEPTED THE FINAL APCH 14 MI OUT. AT THAT TIME, WHEN I XREFED THE GS INTERCEPT WITH THE ALTIMETER, I QUESTIONED MYSELF THAT THE ALTIMETER SEEMED TO READ HIGH. AS WE APCHED THE OM, I ASKED THE CAPT TO VERIFY THE ALTIMETER SETTING. HE DID, AND WE HAD TO RESET THE ALTIMETERS TO 28.58. OUR ALTIMETERS WERE READING 1000 FT HIGH THOUGH WE WERE ON THE GS. THE ALTIMETER HAD DROPPED SIGNIFICANTLY SINCE OUR PREVIOUS ARR THE EVENING BEFORE AND AT 28.58 WAS ABNORMALLY LOW, THUS 29.58 SEEMED A MORE APPROPRIATE SETTING. WE SET THE ALTIMETERS TO WHAT SEEMED NORMAL, WHEREAS 28.58 IS EXCEPTIONALLY LOW. ATC NEVER ASKED ABOUT OUR ALT NOR DID THEY QUESTION OUR ALTIMETER SETTING. IT WAS THE XREFING ONCE THE GS WAS CAPTURED WITH OTHER INSTS THAT MADE ME AWARE OF THE ERROR IN ALTIMETER SETTING.
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.