M20P and GLF2 had near midair collision approximately 1 mi from the end of runway 24 at mvy.

Attributes
ACN	517111
Time
Date	200107
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mvy.airport
State Reference	MA
Altitude	msl single value : 700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mvy.tower
Operator	general aviation : instructional
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 24
Flight Phase	descent : approach
Route In Use	approach : circling
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : mvy.tower
Operator	general aviation : corporate
Make Model Name	Gulfstream II
Operating Under FAR Part	Part 91
Flight Plan	IFR
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 175 flight time total : 8850 flight time type : 65
ASRS Report	517111
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : airborne critical non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action none taken : detected after the fact
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

En route to mvy, I was training an instrument student. I requested a practice ILS 24 with cape approach. They approved this and vectored me onto the localizer about 5 mi out. At approximately 2 1/2 mi out, they handed me off to mvy tower with the instruction of circle to land runway 33. I contacted mvy tower and they cleared me to land on runway 33 with a left break for a right downwind circle to land. About 1 mi from runway 24, I observed a gulfstream slightly to my left at approximately 400 ft above me. I broke right and descended away from the gulfstream and told the tower about the conflict and they cleared me to land on runway 33. I made a right 270 degree turn and made right traffic to land on runway 33. I don't think anyone realized what happened and I didn't say anything. Apparently, that was the end of it. I'm not sure how this occurred or how I could have prevented this situation. I'm glad I was looking outside as the student was doing the practice approach. I should have reported it to the tower, but the incident was over and I don't think the gulfstream pilots knew what happened or mvy tower.

Original NASA ASRS Text

Title: M20P AND GLF2 HAD NMAC APPROX 1 MI FROM THE END OF RWY 24 AT MVY.

Narrative: ENRTE TO MVY, I WAS TRAINING AN INST STUDENT. I REQUESTED A PRACTICE ILS 24 WITH CAPE APCH. THEY APPROVED THIS AND VECTORED ME ONTO THE LOC ABOUT 5 MI OUT. AT APPROX 2 1/2 MI OUT, THEY HANDED ME OFF TO MVY TWR WITH THE INSTRUCTION OF CIRCLE TO LAND RWY 33. I CONTACTED MVY TWR AND THEY CLRED ME TO LAND ON RWY 33 WITH A L BREAK FOR A R DOWNWIND CIRCLE TO LAND. ABOUT 1 MI FROM RWY 24, I OBSERVED A GULFSTREAM SLIGHTLY TO MY L AT APPROX 400 FT ABOVE ME. I BROKE R AND DSNDED AWAY FROM THE GULFSTREAM AND TOLD THE TWR ABOUT THE CONFLICT AND THEY CLRED ME TO LAND ON RWY 33. I MADE A R 270 DEG TURN AND MADE R TFC TO LAND ON RWY 33. I DON'T THINK ANYONE REALIZED WHAT HAPPENED AND I DIDN'T SAY ANYTHING. APPARENTLY, THAT WAS THE END OF IT. I'M NOT SURE HOW THIS OCCURRED OR HOW I COULD HAVE PREVENTED THIS SIT. I'M GLAD I WAS LOOKING OUTSIDE AS THE STUDENT WAS DOING THE PRACTICE APCH. I SHOULD HAVE RPTED IT TO THE TWR, BUT THE INCIDENT WAS OVER AND I DON'T THINK THE GULFSTREAM PLTS KNEW WHAT HAPPENED OR MVY TWR.

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.