<< >> NASA ASRS Report 299967, March 1995

Air carrier X TCASII RA had near midair collision possible less than standard separation with aircraft Y. Evasive action taken climb.

Attributes
ACN	299967
Time
Date	199503
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sna
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 200
ASRS Report	299967
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot conflict : nmac non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Air carrier X (B-757) slc-sna. Socal approach issued left turn to 270 degrees and descent to 3000 ft. Passing approximately 4000 ft approach issued right turn to 330 degrees 'for traffic avoidance.' within seconds a TCASII RA occurred directing a climb requiring a 2000-2500 FPM rate. Approach control was immediately advised of TCASII evasive maneuver by PNF (captain) as the maneuver was in progress. Traffic was never visually sighted. Recovery from the 'clear of conflict' message was accomplished at about 6000 ft. Socal approach issued instructions for an intercept vector to ILS runway 19R at sna. Normal approach and landing were accomplished. It was my impression that due to controller error we were vectored into the path of known IFR traffic. TCASII answered to break the chain of events which would have otherwise ended in disaster.

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Original NASA ASRS Text

Title: ACR X TCASII RA HAD NMAC POSSIBLE LTSS WITH ACFT Y. EVASIVE ACTION TAKEN CLB.

Narrative: ACR X (B-757) SLC-SNA. SOCAL APCH ISSUED L TURN TO 270 DEGS AND DSCNT TO 3000 FT. PASSING APPROX 4000 FT APCH ISSUED R TURN TO 330 DEGS 'FOR TFC AVOIDANCE.' WITHIN SECONDS A TCASII RA OCCURRED DIRECTING A CLB REQUIRING A 2000-2500 FPM RATE. APCH CTL WAS IMMEDIATELY ADVISED OF TCASII EVASIVE MANEUVER BY PNF (CAPT) AS THE MANEUVER WAS IN PROGRESS. TFC WAS NEVER VISUALLY SIGHTED. RECOVERY FROM THE 'CLR OF CONFLICT' MESSAGE WAS ACCOMPLISHED AT ABOUT 6000 FT. SOCAL APCH ISSUED INSTRUCTIONS FOR AN INTERCEPT VECTOR TO ILS RWY 19R AT SNA. NORMAL APCH AND LNDG WERE ACCOMPLISHED. IT WAS MY IMPRESSION THAT DUE TO CTLR ERROR WE WERE VECTORED INTO THE PATH OF KNOWN IFR TFC. TCASII ANSWERED TO BREAK THE CHAIN OF EVENTS WHICH WOULD HAVE OTHERWISE ENDED IN DISASTER.

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.