Near midair collision.

Attributes
ACN	167813
Time
Date	199101
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bzn
State Reference	MT
Altitude	agl bound lower : 700 agl bound upper : 700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	approach : visual
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 240 flight time total : 8000 flight time type : 2500
ASRS Report	167813
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 280 flight time total : 7000 flight time type : 1000
ASRS Report	167582
Events
Anomaly	non adherence : far non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Miss Distance	horizontal : 150 vertical : 35
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Visibility approach to runway 12 bzn on ILS course. 28 mi out approach clearance was received by ZLC for visibility approach bzn. We switched to CTAF frequency 123.65 and all required radio calls were made. Bzn radio responded with WX and all known traffic. At approximately 700' AGL on the ILS runway 12, an small aircraft Y was sighted also flying the ILS course. An abrupt hard right-hand turn, followed by a go around was initiated by the captain, who was flying and first sighted the aircraft. The aircraft was flying extremely slow. It was white and blended in perfectly with the snow covered ground. No required/advisory calls were made by the aircraft. Subsequent conversation face-to-face with pilot of the small aircraft (2 children and wife on board) suggested that the pilot of the small aircraft Y had not observed proper radio procedure. Supplemental information from acn 167582: bzm should have an operating tower and aircraft should have TCAS installed.

Original NASA ASRS Text

Title: NMAC.

Narrative: VIS APCH TO RWY 12 BZN ON ILS COURSE. 28 MI OUT APCH CLRNC WAS RECEIVED BY ZLC FOR VIS APCH BZN. WE SWITCHED TO CTAF FREQ 123.65 AND ALL REQUIRED RADIO CALLS WERE MADE. BZN RADIO RESPONDED WITH WX AND ALL KNOWN TFC. AT APPROX 700' AGL ON THE ILS RWY 12, AN SMA Y WAS SIGHTED ALSO FLYING THE ILS COURSE. AN ABRUPT HARD RIGHT-HAND TURN, FOLLOWED BY A GAR WAS INITIATED BY THE CAPT, WHO WAS FLYING AND FIRST SIGHTED THE ACFT. THE ACFT WAS FLYING EXTREMELY SLOW. IT WAS WHITE AND BLENDED IN PERFECTLY WITH THE SNOW COVERED GND. NO REQUIRED/ADVISORY CALLS WERE MADE BY THE ACFT. SUBSEQUENT CONVERSATION FACE-TO-FACE WITH PLT OF THE SMA (2 CHILDREN AND WIFE ON BOARD) SUGGESTED THAT THE PLT OF THE SMA Y HAD NOT OBSERVED PROPER RADIO PROC. SUPPLEMENTAL INFO FROM ACN 167582: BZM SHOULD HAVE AN OPERATING TWR AND ACFT SHOULD HAVE TCAS INSTALLED.

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.