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Medium large transport flight crew received and read back clearance to FL230. On level off center said cleared to FL220.
| Attributes | |
| ACN | 121791 |
| Time | |
| Date | 198909 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : yxu |
| State Reference | ON |
| Altitude | msl bound lower : 22000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : czyz |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 18000 flight time type : 10000 |
| ASRS Report | 121791 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 7000 flight time type : 1500 |
| ASRS Report | 121786 |
| Events | |
| Anomaly | altitude deviation : overshoot other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Flight from yyz to dtw center issued clearance to what was understood as FL230. First officer acknowledged clearance to FL230 and set altitude alerter to 230 (captain understood clearance to FL230 also and acknowledged first officer's action of setting 230 in altitude alerter). Upon level off at FL230, controller asked, 'identification where are you going, you were assigned FL220'. First officer replied, 'we understood we were cleared to FL230'. Controller replied, 'descend to and maintain FL220'. If in fact FL220 was initially assigned, both the first officer and myself understood the clearance as FL230, which the first officer acknowledged to center as. No correction or transmission was received from his readback. No distractions, unusual workloads or uncertain clearance receipt were a factor in this situation.
Original NASA ASRS Text
Title: MLG FLT CREW RECEIVED AND READ BACK CLRNC TO FL230. ON LEVEL OFF CENTER SAID CLEARED TO FL220.
Narrative: FLT FROM YYZ TO DTW CENTER ISSUED CLRNC TO WHAT WAS UNDERSTOOD AS FL230. F/O ACKNOWLEDGED CLRNC TO FL230 AND SET ALT ALERTER TO 230 (CAPT UNDERSTOOD CLRNC TO FL230 ALSO AND ACKNOWLEDGED F/O'S ACTION OF SETTING 230 IN ALT ALERTER). UPON LEVEL OFF AT FL230, CTLR ASKED, 'ID WHERE ARE YOU GOING, YOU WERE ASSIGNED FL220'. F/O REPLIED, 'WE UNDERSTOOD WE WERE CLRED TO FL230'. CTLR REPLIED, 'DESCEND TO AND MAINTAIN FL220'. IF IN FACT FL220 WAS INITIALLY ASSIGNED, BOTH THE F/O AND MYSELF UNDERSTOOD THE CLRNC AS FL230, WHICH THE F/O ACKNOWLEDGED TO CENTER AS. NO CORRECTION OR XMISSION WAS RECEIVED FROM HIS READBACK. NO DISTRACTIONS, UNUSUAL WORKLOADS OR UNCERTAIN CLRNC RECEIPT WERE A FACTOR IN THIS SITUATION.
Data retrieved from NASA's ASRS site as of August 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.