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Confusion regarding clearance altitude. Descending to 10,000', controller says cleared to 11,000' and descend to 9000' to avoid traffic.
| Attributes | |
| ACN | 120019 |
| Time | |
| Date | 198908 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : zau |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 15000 flight time type : 1200 |
| ASRS Report | 120019 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 12000 flight time type : 120 |
| ASRS Report | 120174 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
Descending into ord for a landing we were cleared via direct pappi, direct ord. We were cleared to cross 'story' intersection at 10,000'. While leveling at 10,000', center called us and asked us our altitude. The first officer told the controller 10,200' for 10,000'. We were then told to descend immediately to 9000' and to do so within 30 seconds. The controller then advised us that our clearance was to 11,000' only, and that we had traffic at 12 O'clock, 6 mi. We leveled at 9000' within seconds, and saw the traffic well ahead and above us.
Original NASA ASRS Text
Title: CONFUSION REGARDING CLRNC ALT. DESCENDING TO 10,000', CTLR SAYS CLEARED TO 11,000' AND DESCEND TO 9000' TO AVOID TRAFFIC.
Narrative: DESCENDING INTO ORD FOR A LNDG WE WERE CLRED VIA DIRECT PAPPI, DIRECT ORD. WE WERE CLRED TO CROSS 'STORY' INTXN AT 10,000'. WHILE LEVELING AT 10,000', CENTER CALLED US AND ASKED US OUR ALT. THE F/O TOLD THE CTLR 10,200' FOR 10,000'. WE WERE THEN TOLD TO DSND IMMEDIATELY TO 9000' AND TO DO SO WITHIN 30 SECONDS. THE CTLR THEN ADVISED US THAT OUR CLRNC WAS TO 11,000' ONLY, AND THAT WE HAD TFC AT 12 O'CLOCK, 6 MI. WE LEVELED AT 9000' WITHIN SECONDS, AND SAW THE TFC WELL AHEAD AND ABOVE US.
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.