Near midair collision with same direction traffic.

Attributes
ACN	187530
Time
Date	199108
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : baf
State Reference	MA
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : baf tower : baf
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	VFR
Person 1
Affiliation	Other
Function	observation : observer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 19000 flight time type : 0
ASRS Report	187530
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 50 flight time total : 358 flight time type : 150
ASRS Report	187527
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	other
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

I was acting as safety observer on an instrument training flight. We were being vectored for a VOR approach to runway 2 at westfield/barnes airport by bradley approach control. We were cleared to 2500 ft and for the approach, and told that we were 8 mi out and had VFR traffic to the same runway at 10 mi out. We were then cleared to baf tower and told to report decar intersection. Just as we reported decar intersection, another aircraft passed underneath us at approximately 100-150 ft. That aircraft was given an immediate left turn and told to enter a left base for runway 2 at baf. We landed uneventfully a little shaken by the experience. We had been maintaining 100 KIAS throughout the vectoring and the approach and did not foresee being overtaken by another aircraft. The other aircraft was a single engine. I could not make out the model.

Original NASA ASRS Text

Title: NMAC WITH SAME DIRECTION TFC.

Narrative: I WAS ACTING AS SAFETY OBSERVER ON AN INST TRAINING FLT. WE WERE BEING VECTORED FOR A VOR APCH TO RWY 2 AT WESTFIELD/BARNES ARPT BY BRADLEY APCH CTL. WE WERE CLRED TO 2500 FT AND FOR THE APCH, AND TOLD THAT WE WERE 8 MI OUT AND HAD VFR TFC TO THE SAME RWY AT 10 MI OUT. WE WERE THEN CLRED TO BAF TWR AND TOLD TO RPT DECAR INTXN. JUST AS WE RPTED DECAR INTXN, ANOTHER ACFT PASSED UNDERNEATH US AT APPROX 100-150 FT. THAT ACFT WAS GIVEN AN IMMEDIATE L TURN AND TOLD TO ENTER A L BASE FOR RWY 2 AT BAF. WE LANDED UNEVENTFULLY A LITTLE SHAKEN BY THE EXPERIENCE. WE HAD BEEN MAINTAINING 100 KIAS THROUGHOUT THE VECTORING AND THE APCH AND DID NOT FORESEE BEING OVERTAKEN BY ANOTHER ACFT. THE OTHER ACFT WAS A SINGLE ENG. I COULD NOT MAKE OUT THE MODEL.

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.