Near midair collision between corp small transport X and small aircraft Y at det.

Attributes
ACN	145985
Time
Date	199005
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : det
State Reference	MI
Altitude	agl bound lower : 600 agl bound upper : 600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : det
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	descent : approach other
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 1500 flight time type : 8
ASRS Report	184595
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

We were cleared to land on runway 33 at det. While on the ILS just inside the OM on about a 3/4 mi final a single engine small aircraft Y crossed through the localizer at our altitude about 500' in front of us. As far as we could tell, the aircraft was told to turn a right base, which crossed directly in our flight path. Our aircraft had to make a hard right turn to miss small aircraft Y. We realigned the aircraft on final after being clear of the small aircraft Y and landed on runway 33.

Original NASA ASRS Text

Title: NMAC BETWEEN CORP SMT X AND SMA Y AT DET.

Narrative: WE WERE CLRED TO LAND ON RWY 33 AT DET. WHILE ON THE ILS JUST INSIDE THE OM ON ABOUT A 3/4 MI FINAL A SINGLE ENG SMA Y CROSSED THROUGH THE LOC AT OUR ALT ABOUT 500' IN FRONT OF US. AS FAR AS WE COULD TELL, THE ACFT WAS TOLD TO TURN A RIGHT BASE, WHICH CROSSED DIRECTLY IN OUR FLT PATH. OUR ACFT HAD TO MAKE A HARD RIGHT TURN TO MISS SMA Y. WE REALIGNED THE ACFT ON FINAL AFTER BEING CLR OF THE SMA Y AND LANDED ON RWY 33.

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.