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When given clearance for descent with a crossing restriction flight crew believed the clearance to be pilot disretion, whereas ATC intended descent to begin immediately.
| Attributes | |
| ACN | 130765 |
| Time | |
| Date | 198912 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : fak |
| State Reference | VA |
| Altitude | msl bound lower : 27000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zc tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time total : 150 |
| ASRS Report | 130765 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
We were at FL270 when ZDC (127.75) gave a clearance to cross fak at FL230, and then to cross brooke VOR at 11000' and 250 KTS. This initial clearance did not specify to leave FL270 when it was given. At 28 DME south of fak, controller called and issued a turn to 60 degree heading and to leave FL270 for FL230. The initial clearance given by controller and read back to controller was not challenged.
Original NASA ASRS Text
Title: WHEN GIVEN CLRNC FOR DESCENT WITH A CROSSING RESTRICTION FLT CREW BELIEVED THE CLRNC TO BE PLT DISRETION, WHEREAS ATC INTENDED DESCENT TO BEGIN IMMEDIATELY.
Narrative: WE WERE AT FL270 WHEN ZDC (127.75) GAVE A CLRNC TO CROSS FAK AT FL230, AND THEN TO CROSS BROOKE VOR AT 11000' AND 250 KTS. THIS INITIAL CLRNC DID NOT SPECIFY TO LEAVE FL270 WHEN IT WAS GIVEN. AT 28 DME S OF FAK, CTLR CALLED AND ISSUED A TURN TO 60 DEG HDG AND TO LEAVE FL270 FOR FL230. THE INITIAL CLRNC GIVEN BY CTLR AND READ BACK TO CTLR WAS NOT CHALLENGED.
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.