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DC8 flight crew perceive and read back climb clearance to FL290. When level, toronto ARTCC states assigned altitude was FL280. Flight crew descends to FL280.
| Attributes | |
| ACN | 426839 |
| Time | |
| Date | 199901 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : yyz |
| State Reference | ON |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 70 |
| Flight Phase | cruise other |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 95 flight time total : 5200 flight time type : 820 |
| ASRS Report | 426839 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 90 flight time total : 3200 flight time type : 460 |
| ASRS Report | 426840 |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight was cleared to climb to FL290 by toronto center during climb. Crew acknowledged clearance to climb to FL290 with toronto center. Approximately 5 mins after leveling off at FL290, toronto center questioned our altitude and said we had been cleared to only FL280. Crew responded that we had heard and read back FL290 on the initial clearance. Toronto center then instructed flight to descend to FL280. Crew complied and descended to FL280 and apologized for their part, if any, during the communication confusion. The controller responded with 'no problem' and provided frequency change to ZOB.
Original NASA ASRS Text
Title: DC8 FLC PERCEIVE AND READ BACK CLB CLRNC TO FL290. WHEN LEVEL, TORONTO ARTCC STATES ASSIGNED ALT WAS FL280. FLC DSNDS TO FL280.
Narrative: FLT WAS CLRED TO CLB TO FL290 BY TORONTO CTR DURING CLB. CREW ACKNOWLEDGED CLRNC TO CLB TO FL290 WITH TORONTO CTR. APPROX 5 MINS AFTER LEVELING OFF AT FL290, TORONTO CTR QUESTIONED OUR ALT AND SAID WE HAD BEEN CLRED TO ONLY FL280. CREW RESPONDED THAT WE HAD HEARD AND READ BACK FL290 ON THE INITIAL CLRNC. TORONTO CTR THEN INSTRUCTED FLT TO DSND TO FL280. CREW COMPLIED AND DSNDED TO FL280 AND APOLOGIZED FOR THEIR PART, IF ANY, DURING THE COM CONFUSION. THE CTLR RESPONDED WITH 'NO PROB' AND PROVIDED FREQ CHANGE TO ZOB.
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.