<< >> NASA ASRS Report 537884, February 2002

ZKC controller questions DC9 flight crew about assigned turn direction as they receive a TCASII alert.

Attributes
ACN	537884
Time
Date	200202
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : alo.airport
State Reference	IA
Altitude	msl bound lower : 26000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc.artcc tower : msp.tower
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zkc.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 7500 flight time type : 1500
ASRS Report	537884
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : tcas other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 21000
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

On radar vectors to alo. Trying to find a smooth altitude, due to turbulence. ZKC gave turn ('turn left 10 degrees for traffic'). As PNF, I repeated instructions. A few mins later, center asked which way we turned and I repeated clearance and direction we turned. Center stated HSI clearance as being a 'right turn' clearance and that we had traffic going in opposite direction off our left side. Approximately at the same time center turned us back to the right, the TCASII gave a TA symbol and audible. After this correction, center passed us on to the next sector.

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Original NASA ASRS Text

Title: ZKC CTLR QUESTIONS DC9 FLC ABOUT ASSIGNED TURN DIRECTION AS THEY RECEIVE A TCASII ALERT.

Narrative: ON RADAR VECTORS TO ALO. TRYING TO FIND A SMOOTH ALT, DUE TO TURB. ZKC GAVE TURN ('TURN L 10 DEGS FOR TFC'). AS PNF, I REPEATED INSTRUCTIONS. A FEW MINS LATER, CTR ASKED WHICH WAY WE TURNED AND I REPEATED CLRNC AND DIRECTION WE TURNED. CTR STATED HSI CLRNC AS BEING A 'R TURN' CLRNC AND THAT WE HAD TFC GOING IN OPPOSITE DIRECTION OFF OUR L SIDE. APPROX AT THE SAME TIME CTR TURNED US BACK TO THE R, THE TCASII GAVE A TA SYMBOL AND AUDIBLE. AFTER THIS CORRECTION, CTR PASSED US ON TO THE NEXT SECTOR.

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.