Flight crew of air carrier medium large transport aircraft failed to maintain assigned heading resulting in less than standard separation. Potential conflict.

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Attributes
ACN	219230
Time
Date	199208
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : als
State Reference	CO
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise 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 : 240 flight time total : 20500 flight time type : 500
ASRS Report	219230
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Center asked for our heading and the told us to maintain that heading. We were proceeding direct ALS after deviating for WX. After passing over ALS we turned 15 degrees left on course forgetting center's clearance to maintain present heading. Center then turned us 90 degrees right to 050 degrees and turned another air carrier flight 20 degrees right. We were turning at our maximum rate. Center said we had a 4 1/2 NM separation. The problem arose as we were given a clearance to maintain present heading 10-15 mins prior to reaching ALS VOR and the heading took us directly over the VOR. The clearance should have been more specific, i.e., maintain present heading after ALS, and should have included a TA. We should have clarified our clearance before turning direct on course.

Original NASA ASRS Text

Title: FLC OF ACR MLG ACFT FAILED TO MAINTAIN ASSIGNED HDG RESULTING IN LTSS. POTENTIAL CONFLICT.

Narrative: CTR ASKED FOR OUR HDG AND THE TOLD US TO MAINTAIN THAT HDG. WE WERE PROCEEDING DIRECT ALS AFTER DEVIATING FOR WX. AFTER PASSING OVER ALS WE TURNED 15 DEGS L ON COURSE FORGETTING CTR'S CLRNC TO MAINTAIN PRESENT HDG. CTR THEN TURNED US 90 DEGS R TO 050 DEGS AND TURNED ANOTHER ACR FLT 20 DEGS R. WE WERE TURNING AT OUR MAX RATE. CTR SAID WE HAD A 4 1/2 NM SEPARATION. THE PROBLEM AROSE AS WE WERE GIVEN A CLRNC TO MAINTAIN PRESENT HDG 10-15 MINS PRIOR TO REACHING ALS VOR AND THE HDG TOOK US DIRECTLY OVER THE VOR. THE CLRNC SHOULD HAVE BEEN MORE SPECIFIC, I.E., MAINTAIN PRESENT HDG AFTER ALS, AND SHOULD HAVE INCLUDED A TA. WE SHOULD HAVE CLARIFIED OUR CLRNC BEFORE TURNING DIRECT ON COURSE.

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.