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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Medium large transport took clearance meant for another aircraft and descended out of his assigned altitude.
| Attributes | |
| ACN | 348490 |
| Time | |
| Date | 199609 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | msl bound lower : 7500 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 tracon : fwa |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 12750 flight time type : 5000 |
| ASRS Report | 348490 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude 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:
Approach control issued a heading and altitude clearance to an air carrier B aircraft. We thought the clearance was for us and read back clearance to ATC. While descending to 4000 ft (the air carrier B clearance) we heard air carrier B advise ATC that an air carrier a aircraft had read back what he thought was his clearance. We stopped descending at 7500 ft MSL, called ATC and asked for a confirmation of our assigned altitude and heading. ATC confirmed what air carrier B had pointed out, we did indeed take his clearance and ATC accepted our readback of air carrier B's clearance without any comment. Frequency was not congested at time -- certainly ATC heard the wrong aircraft respond or the squeal of 2 aircraft broadcasting at the same time, an indication, of readback/hearback error. Similar digits in both acfts' call signs.
Original NASA ASRS Text
Title: MLG TOOK CLRNC MEANT FOR ANOTHER ACFT AND DSNDED OUT OF HIS ASSIGNED ALT.
Narrative: APCH CTL ISSUED A HDG AND ALT CLRNC TO AN ACR B ACFT. WE THOUGHT THE CLRNC WAS FOR US AND READ BACK CLRNC TO ATC. WHILE DSNDING TO 4000 FT (THE ACR B CLRNC) WE HEARD ACR B ADVISE ATC THAT AN ACR A ACFT HAD READ BACK WHAT HE THOUGHT WAS HIS CLRNC. WE STOPPED DSNDING AT 7500 FT MSL, CALLED ATC AND ASKED FOR A CONFIRMATION OF OUR ASSIGNED ALT AND HDG. ATC CONFIRMED WHAT ACR B HAD POINTED OUT, WE DID INDEED TAKE HIS CLRNC AND ATC ACCEPTED OUR READBACK OF ACR B'S CLRNC WITHOUT ANY COMMENT. FREQ WAS NOT CONGESTED AT TIME -- CERTAINLY ATC HEARD THE WRONG ACFT RESPOND OR THE SQUEAL OF 2 ACFT BROADCASTING AT THE SAME TIME, AN INDICATION, OF READBACK/HEARBACK ERROR. SIMILAR DIGITS IN BOTH ACFTS' CALL SIGNS.
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.