Large transport takes evasive action in near midair collision on descent for approach.

Attributes
ACN	243835
Time
Date	199306
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ttd airport : pdx
State Reference	OR
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pdx
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 175 flight time total : 13500 flight time type : 300
ASRS Report	243835
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 165 flight time total : 6175 flight time type : 650
ASRS Report	244103
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	other
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

On vectoring for mill visual runway 28R at pdx, an small aircraft appeared at 1 O'clock passing to 11 O'clock same altitude with less than 100 ft horizontal separation. Our altitude approximately 4000 ft descending to 3000 ft. Aircraft on autoplt initiated violent climbing right turn to miss traffic. No traffic given by ATC. Near miss reported to pdx approach. Landing completed uneventfully. 2 flight attendants injured while performing cabin check at time of maneuver.

Original NASA ASRS Text

Title: LGT TAKES EVASIVE ACTION IN NMAC ON DSCNT FOR APCH.

Narrative: ON VECTORING FOR MILL VISUAL RWY 28R AT PDX, AN SMA APPEARED AT 1 O'CLOCK PASSING TO 11 O'CLOCK SAME ALT WITH LESS THAN 100 FT HORIZ SEPARATION. OUR ALT APPROX 4000 FT DSNDING TO 3000 FT. ACFT ON AUTOPLT INITIATED VIOLENT CLBING R TURN TO MISS TFC. NO TFC GIVEN BY ATC. NEAR MISS RPTED TO PDX APCH. LNDG COMPLETED UNEVENTFULLY. 2 FLT ATTENDANTS INJURED WHILE PERFORMING CABIN CHK AT TIME OF MANEUVER.

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.