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The flight crew of a DC9 received a clearance to descend from FL250 to FL220. The clearance was understood to be at pilot's discretion. When the flight crew did not descend, the ARTCC radar controller intervened and issued a vector to the flight crew for traffic.
| Attributes | |
| ACN | 333273 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : har |
| State Reference | PA |
| Altitude | msl bound lower : 25000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star enroute airway : zny |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 14000 flight time type : 3000 |
| ASRS Report | 333273 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 11000 flight time type : 4000 |
| ASRS Report | 333590 |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Center issued clearance to descend to FL220 (from FL250) which we understood as discretion to FL220. Consequently, we did not start down until questioned by ATC and instructed to begin descent along with a 30 degree left turn for traffic.
Original NASA ASRS Text
Title: THE FLC OF A DC9 RECEIVED A CLRNC TO DSND FROM FL250 TO FL220. THE CLRNC WAS UNDERSTOOD TO BE AT PLT'S DISCRETION. WHEN THE FLC DID NOT DSND, THE ARTCC RADAR CTLR INTERVENED AND ISSUED A VECTOR TO THE FLC FOR TFC.
Narrative: CTR ISSUED CLRNC TO DSND TO FL220 (FROM FL250) WHICH WE UNDERSTOOD AS DISCRETION TO FL220. CONSEQUENTLY, WE DID NOT START DOWN UNTIL QUESTIONED BY ATC AND INSTRUCTED TO BEGIN DSCNT ALONG WITH A 30 DEG L TURN FOR TFC.
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.