B737-400 crew and a DC10 had less than legal separation in zan class a airspace.

Attributes
ACN	541898
Time
Date	200203
Day	Sat
Local Time Of Day	0601 To 1200
Place
State Reference	AK
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zan.artcc
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16950 flight time type : 9650
ASRS Report	541898
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action none taken : detected after the fact other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

TCASII RA. Other aircraft descending through our altitude at 2 mi off (left to left, the DC10 had an alert only).

Original NASA ASRS Text

Title: B737-400 CREW AND A DC10 HAD LESS THAN LEGAL SEPARATION IN ZAN CLASS A AIRSPACE.

Narrative: TCASII RA. OTHER ACFT DSNDING THROUGH OUR ALT AT 2 MI OFF (L TO L, THE DC10 HAD AN ALERT ONLY).

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.