Close proximity air carrier-large transport GA-sam over EMI VOR.

Attributes
ACN	143117
Time
Date	199004
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : emi airport : bwi
State Reference	MD
Altitude	msl bound lower : 7500 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi tower : cle
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival star : star enroute airway : v166
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17500 flight time type : 4500
ASRS Report	143117
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : private pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 0 flight time total : 6000 flight time type : 0
ASRS Report	143376
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 300 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were on the westminster 1 arrival to bwi and had just crossed the EMI VOR, descending through 7500', when a tan small transport was observed off our left wing within 300' horizontal and about the same heading. Bwi approach said they had not observed traffic in the area. I called the bwi approach supervisor on the ground and he said there may be a blind spot in the ewi area due to construction at bwi. I filed a verbal near miss to him over the phone. I feel that the small transport should have had a transponder and mode C in that area. Also we were cleared to 4000' almost 30 mi from bwi in a 'blind spot' area.

Original NASA ASRS Text

Title: CLOSE PROX ACR-LGT GA-SAM OVER EMI VOR.

Narrative: WE WERE ON THE WESTMINSTER 1 ARR TO BWI AND HAD JUST CROSSED THE EMI VOR, DSNDING THROUGH 7500', WHEN A TAN SMT WAS OBSERVED OFF OUR LEFT WING WITHIN 300' HORIZ AND ABOUT THE SAME HDG. BWI APCH SAID THEY HAD NOT OBSERVED TFC IN THE AREA. I CALLED THE BWI APCH SUPVR ON THE GND AND HE SAID THERE MAY BE A BLIND SPOT IN THE EWI AREA DUE TO CONSTRUCTION AT BWI. I FILED A VERBAL NEAR MISS TO HIM OVER THE PHONE. I FEEL THAT THE SMT SHOULD HAVE HAD A XPONDER AND MODE C IN THAT AREA. ALSO WE WERE CLRED TO 4000' ALMOST 30 MI FROM BWI IN A 'BLIND SPOT' AREA.

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.