Potential conflict as 2 opposite direction traffic arcs are allowed to climb descend through occupie...

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.

Potential conflict as 2 opposite direction traffic arcs are allowed to climb descend through occupied altitude.