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ARTCC radar controller gave wrong altimeter setting to flight crew during descent to 11000 ft. When aircraft was level, controller asked their altitude at which time it was discovered the altimeter was 1000 ft off.
| Attributes | |
| ACN | 329570 |
| Time | |
| Date | 199603 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bdf airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zau |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 329570 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 329571 |
| Events | |
| Anomaly | altitude deviation : overshoot other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Approaching bdf at FL240, ZAU cleared us to 16000 ft with an altimeter setting of 30.61 inches. I read back 30.61 inches. During descent, cleared to cross benky at 11000 ft. When level at 11000 ft on our altimeters, center questioned our altitude and said he had us at 10000 ft. That was when we realized the altimeter setting should have been 29.61. Cleared to maintain 10000 ft. No traffic conflict occurred.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR GAVE WRONG ALTIMETER SETTING TO FLC DURING DSCNT TO 11000 FT. WHEN ACFT WAS LEVEL, CTLR ASKED THEIR ALT AT WHICH TIME IT WAS DISCOVERED THE ALTIMETER WAS 1000 FT OFF.
Narrative: APCHING BDF AT FL240, ZAU CLRED US TO 16000 FT WITH AN ALTIMETER SETTING OF 30.61 INCHES. I READ BACK 30.61 INCHES. DURING DSCNT, CLRED TO CROSS BENKY AT 11000 FT. WHEN LEVEL AT 11000 FT ON OUR ALTIMETERS, CTR QUESTIONED OUR ALT AND SAID HE HAD US AT 10000 FT. THAT WAS WHEN WE REALIZED THE ALTIMETER SETTING SHOULD HAVE BEEN 29.61. CLRED TO MAINTAIN 10000 FT. NO TFC CONFLICT OCCURRED.
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.