<< >> NASA ASRS Report 423029, December 1998

Flight crew of a super MD80 stopped descending and climbed in response to a TCASII alert and noticed another aircraft cross by below their aircraft that had not been given as an advisory by the ARTCC radar controller.

Attributes
ACN	423029
Time
Date	199812
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bdf
State Reference	IL
Altitude	msl bound lower : 14500 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zau
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	423029
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Consequence	Other
Miss Distance	vertical : 600
Supplementary
Air Traffic Incident	Pilot Deviation Operational Deviation other

Narrative:

Location: 20 DME prior to benky-bradford arrival. Descending through 15000 ft to cross benky at 11000 ft, we received a TA. I disconnected the autoplt and autothrottles and began a climbing left turn to avoid the obvious conflict. The TA turned to an RA. We missed VFR traffic at 14500 ft opposite direction on the arrival radial. ATC never called out traffic. Without TCASII and had we been IMC, I feel we would have had a midair collision.

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Original NASA ASRS Text

Title: FLC OF A SUPER MD80 STOPPED DSNDING AND CLBED IN RESPONSE TO A TCASII ALERT AND NOTICED ANOTHER ACFT CROSS BY BELOW THEIR ACFT THAT HAD NOT BEEN GIVEN AS AN ADVISORY BY THE ARTCC RADAR CTLR.

Narrative: LOCATION: 20 DME PRIOR TO BENKY-BRADFORD ARR. DSNDING THROUGH 15000 FT TO CROSS BENKY AT 11000 FT, WE RECEIVED A TA. I DISCONNECTED THE AUTOPLT AND AUTOTHROTTLES AND BEGAN A CLBING L TURN TO AVOID THE OBVIOUS CONFLICT. THE TA TURNED TO AN RA. WE MISSED VFR TFC AT 14500 FT OPPOSITE DIRECTION ON THE ARR RADIAL. ATC NEVER CALLED OUT TFC. WITHOUT TCASII AND HAD WE BEEN IMC, I FEEL WE WOULD HAVE HAD A MIDAIR COLLISION.

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.