An astra corporate PIC's report on a possible near midair collision with a G2 turning final for runway 11 while 3 mi out on ILS final approach to runway 11 at bed, ma.

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Attributes
ACN	457348
Time
Date	199912
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bed.airport
State Reference	MA
Altitude	agl bound lower : 1500 agl bound upper : 2000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bed.tower
Operator	general aviation : corporate
Make Model Name	IAI1125 (Astra)
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 11
Flight Phase	descent : vacating altitude descent : approach
Route In Use	approach : circling approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : bed.tower
Operator	general aviation : corporate
Make Model Name	Gulfstream II
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	approach : visual approach : traffic pattern
Flight Plan	VFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 12000 flight time type : 250
ASRS Report	457348
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne critical non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Miss Distance	horizontal : 1200 vertical : 500
Supplementary
Problem Areas	Airspace Structure Weather Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

My aircraft was cleared for a runway 11 ILS, circle to runway 5, then changed to straight in ILS runway 11. Inside LOM we got a TCASII warning and then RA as we broke out of the clouds. We saw a G2 turning base into and under us about 500 ft below. Being visual and with tower telling us to enter runway 5 pattern, we completed the landing on runway 5 as aircraft Y rolled out runway 11. There was a bad lack of coordination between boston and hanscom field tower allowing a VFR G2 to turn into a cleared astra on ILS final. This could have been an accident very easily. Please emphasize coordination between approach facilities and towers. Callback conversation with reporter revealed the following information: the reporter, PIC, stated that they had made a call to the tower after the LOM had been passed, by about 1 mi or so. About that time they were breaking into VMC conditions, seeing the G2 on a right base. They performed a go around evasive action and the G2 landed runway 11 as planned. Reporter believes that the incident was based upon a lack of coordination between A90 approach controller and the tower at bed. The G2 was always there on a training flight. It was a marginal VFR day. Horizontal miss distance was about 1/4 mi or less.

Original NASA ASRS Text

Title: AN ASTRA CORPORATE PIC'S RPT ON A POSSIBLE NMAC WITH A G2 TURNING FINAL FOR RWY 11 WHILE 3 MI OUT ON ILS FINAL APCH TO RWY 11 AT BED, MA.

Narrative: MY ACFT WAS CLRED FOR A RWY 11 ILS, CIRCLE TO RWY 5, THEN CHANGED TO STRAIGHT IN ILS RWY 11. INSIDE LOM WE GOT A TCASII WARNING AND THEN RA AS WE BROKE OUT OF THE CLOUDS. WE SAW A G2 TURNING BASE INTO AND UNDER US ABOUT 500 FT BELOW. BEING VISUAL AND WITH TWR TELLING US TO ENTER RWY 5 PATTERN, WE COMPLETED THE LNDG ON RWY 5 AS ACFT Y ROLLED OUT RWY 11. THERE WAS A BAD LACK OF COORD BTWN BOSTON AND HANSCOM FIELD TWR ALLOWING A VFR G2 TO TURN INTO A CLRED ASTRA ON ILS FINAL. THIS COULD HAVE BEEN AN ACCIDENT VERY EASILY. PLEASE EMPHASIZE COORD BTWN APCH FACILITIES AND TWRS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR, PIC, STATED THAT THEY HAD MADE A CALL TO THE TWR AFTER THE LOM HAD BEEN PASSED, BY ABOUT 1 MI OR SO. ABOUT THAT TIME THEY WERE BREAKING INTO VMC CONDITIONS, SEEING THE G2 ON A R BASE. THEY PERFORMED A GAR EVASIVE ACTION AND THE G2 LANDED RWY 11 AS PLANNED. RPTR BELIEVES THAT THE INCIDENT WAS BASED UPON A LACK OF COORD BTWN A90 APCH CTLR AND THE TWR AT BED. THE G2 WAS ALWAYS THERE ON A TRAINING FLT. IT WAS A MARGINAL VFR DAY. HORIZ MISS DISTANCE WAS ABOUT 1/4 MI OR LESS.

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.