<< >> NASA ASRS Report 408738, July 1998

TRACON approach controller reacts to 2 pilot TCASII RA's, initiating turns. One pilot chooses not to react to the TCASII RA. Conflict alert activates from dual pilot actions.

Attributes
ACN	408738
Time
Date	199807
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : msp
State Reference	MN
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msp
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 14
ASRS Report	408738
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

#1 DC9 level flight 11000 ft. #2 DC9 climbing out, receives TCASII RA to descend. #1 TCASII RA to climb. But later, said he saw traffic and disregarded climb RA. This was all unknown to me. Conflict alert goes off, I turn aircraft #1 who I was working to miss aircraft #2 who departure control was working.

Related reports:

• ZID controller and handoff developmental do not observe conf...
• Aircraft in clouds at 6000 ft was assigned descent to 4000 f...
• B737 flight crew issued visual approach but unable to remain...
• After conflict alert activates, ZDC controller takes action ...
• Conflict alert activates when ZID controller misses conflict...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: TRACON APCH CTLR REACTS TO 2 PLT TCASII RA'S, INITIATING TURNS. ONE PLT CHOOSES NOT TO REACT TO THE TCASII RA. CONFLICT ALERT ACTIVATES FROM DUAL PLT ACTIONS.

Narrative: #1 DC9 LEVEL FLT 11000 FT. #2 DC9 CLBING OUT, RECEIVES TCASII RA TO DSND. #1 TCASII RA TO CLB. BUT LATER, SAID HE SAW TFC AND DISREGARDED CLB RA. THIS WAS ALL UNKNOWN TO ME. CONFLICT ALERT GOES OFF, I TURN ACFT #1 WHO I WAS WORKING TO MISS ACFT #2 WHO DEP CTL WAS WORKING.

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.