Multiple runway operation parallel runways air carrier X no adherence to ATC clearance TCASII RA had conflict with VFR aircraft Y. Evasive action taken by aircraft Y. See and avoid concept.

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Attributes
ACN	262130
Time
Date	199401
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pdx
State Reference	OR
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pdx
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent : approach
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 12
ASRS Report	262130
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X (a DH8) was on a visual approach. Air carrier X was crossing from right to left in front and below aircraft Y. Aircraft Y was VFR on approach to a parallel runway at an altitude above air carrier X. Aircraft Y was restr to 4000 ft with air carrier X at 3700 ft descending. Air carrier X received a TCASII alert and climbed into the side of aircraft Y. Aircraft Y took action to avoid a collision with air carrier X. Air carrier X was TCASII equipped, Y was not.

Original NASA ASRS Text

Title: MULTIPLE RWY OP PARALLEL RWYS ACR X NO ADHERENCE TO ATC CLRNC TCASII RA HAD CONFLICT WITH VFR ACFT Y. EVASIVE ACTION TAKEN BY ACFT Y. SEE AND AVOID CONCEPT.

Narrative: ACR X (A DH8) WAS ON A VISUAL APCH. ACR X WAS XING FROM R TO L IN FRONT AND BELOW ACFT Y. ACFT Y WAS VFR ON APCH TO A PARALLEL RWY AT AN ALT ABOVE ACR X. ACFT Y WAS RESTR TO 4000 FT WITH ACR X AT 3700 FT DSNDING. ACR X RECEIVED A TCASII ALERT AND CLBED INTO THE SIDE OF ACFT Y. ACFT Y TOOK ACTION TO AVOID A COLLISION WITH ACR X. ACR X WAS TCASII EQUIPPED, Y WAS NOT.

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.