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A loss of separation occurs when ZDC ARTCC radar controller permits flight to climb through occupied altitude.
| Attributes | |
| ACN | 461614 |
| Time | |
| Date | 200001 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : vills |
| State Reference | NJ |
| Altitude | msl single value : 22400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j37.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 250 |
| ASRS Report | 461614 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | flight crew : took precautionary avoidance action |
| Miss Distance | horizontal : 300 vertical : 1500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
Captain flying, autoplt engaged, established at FL180 on J37. ZNY cleared us to FL240, which we acknowledged and began climb to FL240. A few seconds later, ZNY issued us a frequency change to ZDC on 121.02, which we also acknowledged. We called ZDC and reported leaving FL195 for FL240 which they acknowledged. At FL224, TCASII issued a TA. I disconnected autoplt and autothrottles, reduced my rate of climb, and a few seconds later I observed opposite direction traffic (aircraft Y) pass overhead. ATC asked us what flight level we were at and we replied 'FL225.' after a few seconds of radio silence, ATC told us to climb to FL240, which we acknowledged. Flight continued to destination uneventfully.
Original NASA ASRS Text
Title: A LOSS OF SEPARATION OCCURS WHEN ZDC ARTCC RADAR CTLR PERMITS FLT TO CLB THROUGH OCCUPIED ALT.
Narrative: CAPT FLYING, AUTOPLT ENGAGED, ESTABLISHED AT FL180 ON J37. ZNY CLRED US TO FL240, WHICH WE ACKNOWLEDGED AND BEGAN CLB TO FL240. A FEW SECONDS LATER, ZNY ISSUED US A FREQ CHANGE TO ZDC ON 121.02, WHICH WE ALSO ACKNOWLEDGED. WE CALLED ZDC AND RPTED LEAVING FL195 FOR FL240 WHICH THEY ACKNOWLEDGED. AT FL224, TCASII ISSUED A TA. I DISCONNECTED AUTOPLT AND AUTOTHROTTLES, REDUCED MY RATE OF CLB, AND A FEW SECONDS LATER I OBSERVED OPPOSITE DIRECTION TFC (ACFT Y) PASS OVERHEAD. ATC ASKED US WHAT FLT LEVEL WE WERE AT AND WE REPLIED 'FL225.' AFTER A FEW SECONDS OF RADIO SILENCE, ATC TOLD US TO CLB TO FL240, WHICH WE ACKNOWLEDGED. FLT CONTINUED TO DEST UNEVENTFULLY.
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.