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Potential conflict as 2 opposite direction traffic arcs are allowed to climb descend through occupied altitude.
| Attributes | |
| ACN | 261170 |
| Time | |
| Date | 199401 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cdo airport : sdq |
| State Reference | FO |
| Altitude | msl bound lower : 7800 msl bound upper : 7800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : oak |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : a554 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 22000 flight time type : 2000 |
| ASRS Report | 261170 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Airways clearance received from sdq tower did not include transponder squawk. We were cleared to takeoff from runway 35 sdq with kodix 2 departure. The transponder code would be given after the 5 mi DME, from cdo on W-4. The departure was complied with exactly. Shortly after the DME/cdo, sdq departure asked for our altitude, which was 4300 ft. He then asked inbound air carrier Y their altitude. Which was 13500 ft. He then asked if we were joining A-554, we replied not yet but would be shortly. He then asked air carrier Y his DME from cdo. They replied '30 something'?? All of this led us to think air carrier Y was inbound on W-4, he wasn't. They were in fact inbound on A-554. A min passed then we joined A-554. At this point we got a TA from our TCASII. It was apparent that we would pass clear of air carrier Y. End of event.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT AS 2 OPPOSITE DIRECTION TFC ARCS ARE ALLOWED TO CLB DSND THROUGH OCCUPIED ALT.
Narrative: AIRWAYS CLRNC RECEIVED FROM SDQ TWR DID NOT INCLUDE XPONDER SQUAWK. WE WERE CLRED TO TKOF FROM RWY 35 SDQ WITH KODIX 2 DEP. THE XPONDER CODE WOULD BE GIVEN AFTER THE 5 MI DME, FROM CDO ON W-4. THE DEP WAS COMPLIED WITH EXACTLY. SHORTLY AFTER THE DME/CDO, SDQ DEP ASKED FOR OUR ALT, WHICH WAS 4300 FT. HE THEN ASKED INBOUND ACR Y THEIR ALT. WHICH WAS 13500 FT. HE THEN ASKED IF WE WERE JOINING A-554, WE REPLIED NOT YET BUT WOULD BE SHORTLY. HE THEN ASKED ACR Y HIS DME FROM CDO. THEY REPLIED '30 SOMETHING'?? ALL OF THIS LED US TO THINK ACR Y WAS INBOUND ON W-4, HE WASN'T. THEY WERE IN FACT INBOUND ON A-554. A MIN PASSED THEN WE JOINED A-554. AT THIS POINT WE GOT A TA FROM OUR TCASII. IT WAS APPARENT THAT WE WOULD PASS CLR OF ACR Y. END OF EVENT.
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.