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During a low altimeter period, an air carrier PF inadvertently set the altimeter 1 inch higher than the local setting. The aircraft's descent below assigned altitude while on a turn to final approach, was caught by approach controller.
| Attributes | |
| ACN | 327210 |
| Time | |
| Date | 199602 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : anc |
| State Reference | AK |
| Altitude | msl bound lower : 1400 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : anc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 327210 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Low altimeter reported on sequence WX and on ATIS as 28.88 inches. During descent set 29.88 inches in altimeter. Did not catch error during approach check where altimeter setting was verified. During turn to final, approach asked us to confirm altimeter setting and altitude. We were in a slow descent and immediately began climb and reset altimeter. We probably got 200 ft below assigned altitude of 1600 ft. WX was a contributing factor as we were concerned about 20-25 KT crosswind and were talking about reference speed additive. Also during approach check, a full readout of altimeter 28.88 inches should have been made instead of '88' which I may have said.
Original NASA ASRS Text
Title: DURING A LOW ALTIMETER PERIOD, AN ACR PF INADVERTENTLY SET THE ALTIMETER 1 INCH HIGHER THAN THE LCL SETTING. THE ACFT'S DSCNT BELOW ASSIGNED ALT WHILE ON A TURN TO FINAL APCH, WAS CAUGHT BY APCH CTLR.
Narrative: LOW ALTIMETER RPTED ON SEQUENCE WX AND ON ATIS AS 28.88 INCHES. DURING DSCNT SET 29.88 INCHES IN ALTIMETER. DID NOT CATCH ERROR DURING APCH CHK WHERE ALTIMETER SETTING WAS VERIFIED. DURING TURN TO FINAL, APCH ASKED US TO CONFIRM ALTIMETER SETTING AND ALT. WE WERE IN A SLOW DSCNT AND IMMEDIATELY BEGAN CLB AND RESET ALTIMETER. WE PROBABLY GOT 200 FT BELOW ASSIGNED ALT OF 1600 FT. WX WAS A CONTRIBUTING FACTOR AS WE WERE CONCERNED ABOUT 20-25 KT XWIND AND WERE TALKING ABOUT REF SPD ADDITIVE. ALSO DURING APCH CHK, A FULL READOUT OF ALTIMETER 28.88 INCHES SHOULD HAVE BEEN MADE INSTEAD OF '88' WHICH I MAY HAVE SAID.
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.