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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ARTCC controller advised the flight crew of a B737 that they were indicating 300 ft low on their assigned altitude. Since the captain's and the first officer's altimeters read the correct altitude, they switched to the #2 transponder and their altitude indicated on assigned altitude by ATC.
| Attributes | |
| ACN | 365540 |
| Time | |
| Date | 199704 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : cgt |
| State Reference | IL |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 13000 flight time type : 210 |
| ASRS Report | 365540 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Cruising en route at FL230, ATC advised us that our altitude was 300 ft low. After checking the captain and first officer altimeters and finding both reading FL230 with no deviations, we selected transponder #2. ATC then advised he was reading FL230 as well. No further problems.
Original NASA ASRS Text
Title: ARTCC CTLR ADVISED THE FLC OF A B737 THAT THEY WERE INDICATING 300 FT LOW ON THEIR ASSIGNED ALT. SINCE THE CAPT'S AND THE FO'S ALTIMETERS READ THE CORRECT ALT, THEY SWITCHED TO THE #2 XPONDER AND THEIR ALT INDICATED ON ASSIGNED ALT BY ATC.
Narrative: CRUISING ENRTE AT FL230, ATC ADVISED US THAT OUR ALT WAS 300 FT LOW. AFTER CHKING THE CAPT AND FO ALTIMETERS AND FINDING BOTH READING FL230 WITH NO DEVS, WE SELECTED XPONDER #2. ATC THEN ADVISED HE WAS READING FL230 AS WELL. NO FURTHER PROBS.
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.