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Large transport flight crew has confusion in altimeter due to using hectar pascals verses inches of mercury.
| Attributes | |
| ACN | 296143 |
| Time | |
| Date | 199502 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ams |
| State Reference | FO |
| Altitude | msl bound lower : 1750 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ams |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 2000 |
| ASRS Report | 296143 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared to descend to altitude 2000 ft. Altimeter setting 0999 hectar pascals (mbs). PF set 29.99 in hg. PNF set 0999 mbs but did not cross check PF setting of 29.99 in hg. Relief pilot did not check either. Descended to 1750 ft before all 3 pilots realized error. Climbed back to altitude 2000 ft and completed the approach. ATC said nothing. Emphasizes how easy it is to make this mistake when flying USA and europe.
Original NASA ASRS Text
Title: LGT FLC HAS CONFUSION IN ALTIMETER DUE TO USING HECTAR PASCALS VERSES INCHES OF MERCURY.
Narrative: CLRED TO DSND TO ALT 2000 FT. ALTIMETER SETTING 0999 HECTAR PASCALS (MBS). PF SET 29.99 IN HG. PNF SET 0999 MBS BUT DID NOT CROSS CHK PF SETTING OF 29.99 IN HG. RELIEF PLT DID NOT CHK EITHER. DSNDED TO 1750 FT BEFORE ALL 3 PLTS REALIZED ERROR. CLBED BACK TO ALT 2000 FT AND COMPLETED THE APCH. ATC SAID NOTHING. EMPHASIZES HOW EASY IT IS TO MAKE THIS MISTAKE WHEN FLYING USA AND EUROPE.
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.