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A B767 pilot set qnh of 29.98 when the actual setting was 998. Consequently the aircraft was 480 ft low on approach to a foreign airport when questioned by ATC.
| Attributes | |
| ACN | 800309 |
| Time | |
| Date | 200808 |
| Place | |
| Locale Reference | atc facility : zzzz.tracon |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : xxl |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 800309 |
| Person 2 | |
| Affiliation | government : foreign |
| Function | controller : approach |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On descent for ILS to runway xxl; approach advised altimeter setting of 998. Both pilots confirmed and set 29.98. We then were vectored for the ILS to runway xxl and cleared to descend to 2500 ft. When we leveled off approach control requested our current altitude and if we received the qnh of 998. We then reset our altimeters and returned to 2500 ft. Because we set 29.98 altimeter setting and not qnh 998 we ended up descending to 2040 ft instead of our assigned altitude of 2500 ft. When outside us be aware of qnh altimeter settings.
Original NASA ASRS Text
Title: A B767 PILOT SET QNH OF 29.98 WHEN THE ACTUAL SETTING WAS 998. CONSEQUENTLY THE ACFT WAS 480 FT LOW ON APCH TO A FOREIGN ARPT WHEN QUESTIONED BY ATC.
Narrative: ON DSCNT FOR ILS TO RWY XXL; APCH ADVISED ALTIMETER SETTING OF 998. BOTH PLTS CONFIRMED AND SET 29.98. WE THEN WERE VECTORED FOR THE ILS TO RWY XXL AND CLRED TO DSND TO 2500 FT. WHEN WE LEVELED OFF APCH CTL REQUESTED OUR CURRENT ALT AND IF WE RECEIVED THE QNH OF 998. WE THEN RESET OUR ALTIMETERS AND RETURNED TO 2500 FT. BECAUSE WE SET 29.98 ALTIMETER SETTING AND NOT QNH 998 WE ENDED UP DSNDING TO 2040 FT INSTEAD OF OUR ASSIGNED ALT OF 2500 FT. WHEN OUTSIDE US BE AWARE OF QNH ALTIMETER SETTINGS.
Data retrieved from NASA's ASRS site as of May 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.