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An LJ36 crew, on approach to einn, misunderstood ATC, setting their altimeters to 29.94, when in fact ATC had given a .994 millibar setting.
| Attributes | |
| ACN | 536764 |
| Time | |
| Date | 200202 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : einn.airport |
| State Reference | FO |
| Altitude | msl bound lower : 3550 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : eisn.artcc tower : det.tower |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 36 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 2000 |
| ASRS Report | 536764 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | flight crew : returned to assigned altitude other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor ATC Human Performance Airspace Structure |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During approach into shannon, ireland, for a technical fuel stop, we were on a radar vector and descending through transition altitude to assigned altitude of 4000 ft MSL. Shannon assigned 4000 ft and gave altimeter setting of 994. Crew understood altimeter to be 29.94 because controller failed to say 994 millibars. Crew set altimeter setting and approach said we were lower than assigned altitude. Crew selected proper altimeter of .994 millibars and was about 450 ft low. Approach advised he gave us .994 millibars and nothing else was said. We leveled at 4000 ft and landed.
Original NASA ASRS Text
Title: AN LJ36 CREW, ON APCH TO EINN, MISUNDERSTOOD ATC, SETTING THEIR ALTIMETERS TO 29.94, WHEN IN FACT ATC HAD GIVEN A .994 MILLIBAR SETTING.
Narrative: DURING APCH INTO SHANNON, IRELAND, FOR A TECHNICAL FUEL STOP, WE WERE ON A RADAR VECTOR AND DSNDING THROUGH TRANSITION ALT TO ASSIGNED ALT OF 4000 FT MSL. SHANNON ASSIGNED 4000 FT AND GAVE ALTIMETER SETTING OF 994. CREW UNDERSTOOD ALTIMETER TO BE 29.94 BECAUSE CTLR FAILED TO SAY 994 MILLIBARS. CREW SET ALTIMETER SETTING AND APCH SAID WE WERE LOWER THAN ASSIGNED ALT. CREW SELECTED PROPER ALTIMETER OF .994 MILLIBARS AND WAS ABOUT 450 FT LOW. APCH ADVISED HE GAVE US .994 MILLIBARS AND NOTHING ELSE WAS SAID. WE LEVELED AT 4000 FT AND LANDED.
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.