Near midair collision.

Attributes
ACN	188352
Time
Date	199108
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : myf
State Reference	CA
Altitude	msl bound lower : 1800 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : san tower : den
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 60 flight time total : 345 flight time type : 133
ASRS Report	188352
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

After clearance for approach and vectored to intercept localizer, approach notified me of traffic, 2 separate aircraft, just prior to release to CTAF frequency notified that 1 aircraft was no longer a factor, neither aircraft in sight. Announced position inbound over CTAF. Heard another aircraft announce position that was nearby. Looked down, forward and slightly to left, observed navigation lights of high wing aircraft, also inbound, no strobes. Immediately halted descent and veered to right, passed other aircraft and completed landing without further incident. Due to position and track of other aircraft, am convinced that it also was tracking the localizer, of course without ATC communication. As to future prevention, when tower is closed, will likely request 360 from approach (if in VMC) unless other aircraft in view.

Original NASA ASRS Text

Title: NMAC.

Narrative: AFTER CLRNC FOR APCH AND VECTORED TO INTERCEPT LOC, APCH NOTIFIED ME OF TFC, 2 SEPARATE ACFT, JUST PRIOR TO RELEASE TO CTAF FREQ NOTIFIED THAT 1 ACFT WAS NO LONGER A FACTOR, NEITHER ACFT IN SIGHT. ANNOUNCED POS INBOUND OVER CTAF. HEARD ANOTHER ACFT ANNOUNCE POS THAT WAS NEARBY. LOOKED DOWN, FORWARD AND SLIGHTLY TO L, OBSERVED NAV LIGHTS OF HIGH WING ACFT, ALSO INBOUND, NO STROBES. IMMEDIATELY HALTED DSCNT AND VEERED TO R, PASSED OTHER ACFT AND COMPLETED LNDG WITHOUT FURTHER INCIDENT. DUE TO POS AND TRACK OF OTHER ACFT, AM CONVINCED THAT IT ALSO WAS TRACKING THE LOC, OF COURSE WITHOUT ATC COM. AS TO FUTURE PREVENTION, WHEN TWR IS CLOSED, WILL LIKELY REQUEST 360 FROM APCH (IF IN VMC) UNLESS OTHER ACFT IN VIEW.

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.