Light transport and small aircraft have near midair collision on approach to ykm.

Attributes
ACN	93342
Time
Date	198808
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ykm
State Reference	WA
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ykm
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 9000 flight time type : 600
ASRS Report	93342
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our flight was cleared for approach following an small aircraft Z on short final. The tower informed us that an small aircraft Y was inbound. Subsequent radio transmissions indicated that the aircraft had us in sight. We turned final and at 2 mi the tower again informed both aircraft of each others position. At approximately 1 mi and 1000' AGL I saw the small aircraft Y converging from my right and above at a distance of 100' or less. I then initiated evasive action by rapidly descending the aircraft and then completed the landing west/O further incident.

Original NASA ASRS Text

Title: LTT AND SMA HAVE NMAC ON APCH TO YKM.

Narrative: OUR FLT WAS CLRED FOR APCH FOLLOWING AN SMA Z ON SHORT FINAL. THE TWR INFORMED US THAT AN SMA Y WAS INBND. SUBSEQUENT RADIO TRANSMISSIONS INDICATED THAT THE ACFT HAD US IN SIGHT. WE TURNED FINAL AND AT 2 MI THE TWR AGAIN INFORMED BOTH ACFT OF EACH OTHERS POS. AT APPROX 1 MI AND 1000' AGL I SAW THE SMA Y CONVERGING FROM MY R AND ABOVE AT A DISTANCE OF 100' OR LESS. I THEN INITIATED EVASIVE ACTION BY RAPIDLY DSNDING THE ACFT AND THEN COMPLETED THE LNDG W/O FURTHER INCIDENT.

Data retrieved from NASA's ASRS site as of August 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.