<< >> NASA ASRS Report 578317, March 2003

Flight crew of MD80 reports TCASII RA maneuver at 16500 ft over oly on arrival to sea. TRACON denies having traffic on radar.

Attributes
ACN	578317
Time
Date	200303
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : olm.vortac
State Reference	WA
Altitude	msl single value : 16600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : olm four
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	578317
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical non adherence : required legal separation
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took precautionary avoidance action other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	Weather ATC Human Performance Airspace Structure FAA
Primary Problem	ATC Human Performance

Narrative:

We were cleared for the olympia 4 arrival. Over oly at 17000 ft, seattle approach control cleared us to descend and maintain 12000 ft. We began the descent and turned over oly on the arrival. We got a TCASII RA at 16600 ft commanding a climb to avoid the traffic. We followed the TCASII commands, and advised approach of our climb and the RA. TCASII showed 400 ft separation from the target at closest. We never had visual contact. Approach had no contact with the conflicting traffic either. We advised approach when we were clear of the traffic, and we continued the approach normally.

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Original NASA ASRS Text

Title: FLC OF MD80 RPTS TCASII RA MANEUVER AT 16500 FT OVER OLY ON ARR TO SEA. TRACON DENIES HAVING TFC ON RADAR.

Narrative: WE WERE CLRED FOR THE OLYMPIA 4 ARR. OVER OLY AT 17000 FT, SEATTLE APCH CTL CLRED US TO DSND AND MAINTAIN 12000 FT. WE BEGAN THE DSCNT AND TURNED OVER OLY ON THE ARR. WE GOT A TCASII RA AT 16600 FT COMMANDING A CLB TO AVOID THE TFC. WE FOLLOWED THE TCASII COMMANDS, AND ADVISED APCH OF OUR CLB AND THE RA. TCASII SHOWED 400 FT SEPARATION FROM THE TARGET AT CLOSEST. WE NEVER HAD VISUAL CONTACT. APCH HAD NO CONTACT WITH THE CONFLICTING TFC EITHER. WE ADVISED APCH WHEN WE WERE CLR OF THE TFC, AND WE CONTINUED THE APCH NORMALLY.

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.