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Air carrier aircraft received clearance to cross an intersection at 11000 ft. Read back 11000 ft; but descended to 10000 ft.
| Attributes | |
| ACN | 690462 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : oxi.vor |
| State Reference | IN |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar controller : non radar |
| Experience | controller military : 3 controller non radar : 2 controller radar : 16 controller time certified in position1 : 14 |
| ASRS Report | 690462 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | airspace violation : entry altitude deviation : overshoot altitude deviation : crossing restriction not met non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was given a clearance to cross 5 mi southeast of the bearz intersection at 11000 ft. The pilot read it back correctly. When the aircraft got near bearz; I noticed the aircraft at 10000 ft. I questioned the pilot of his altitude and he said 10000 ft. I told him his assigned altitude was 11000 ft. He said he read back 10000 ft. After listening to the tape; everything I did was correct and the pilot read back an altitude of 11000 ft. I only own to 11000 ft. The mdw inbounds are going in at 10000 ft below my airspace. It was just plain luck that there wasn't an aircraft below air carrier X at that time. ATC controllers are being held accountable for catching every missed hearback/readback errors. Pilots should be accountable for missing their readbacks. When a pilot reads a clearance back correctly; there is no way for me to catch a mistake until it is too late.
Original NASA ASRS Text
Title: ACR ACFT RECEIVED CLRNC TO CROSS AN INTXN AT 11000 FT. READ BACK 11000 FT; BUT DSNDED TO 10000 FT.
Narrative: ACR X WAS GIVEN A CLRNC TO CROSS 5 MI SE OF THE BEARZ INTXN AT 11000 FT. THE PLT READ IT BACK CORRECTLY. WHEN THE ACFT GOT NEAR BEARZ; I NOTICED THE ACFT AT 10000 FT. I QUESTIONED THE PLT OF HIS ALT AND HE SAID 10000 FT. I TOLD HIM HIS ASSIGNED ALT WAS 11000 FT. HE SAID HE READ BACK 10000 FT. AFTER LISTENING TO THE TAPE; EVERYTHING I DID WAS CORRECT AND THE PLT READ BACK AN ALT OF 11000 FT. I ONLY OWN TO 11000 FT. THE MDW INBOUNDS ARE GOING IN AT 10000 FT BELOW MY AIRSPACE. IT WAS JUST PLAIN LUCK THAT THERE WASN'T AN ACFT BELOW ACR X AT THAT TIME. ATC CTLRS ARE BEING HELD ACCOUNTABLE FOR CATCHING EVERY MISSED HEARBACK/READBACK ERRORS. PLTS SHOULD BE ACCOUNTABLE FOR MISSING THEIR READBACKS. WHEN A PLT READS A CLRNC BACK CORRECTLY; THERE IS NO WAY FOR ME TO CATCH A MISTAKE UNTIL IT IS TOO LATE.
Data retrieved from NASA's ASRS site as of January 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.