Near midair collision between small aircraft X and small bizjet near mht.

Attributes
ACN	177347
Time
Date	199104
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mht
State Reference	NH
Altitude	msl bound lower : 5500 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mht
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 25000 flight time type : 5
ASRS Report	177347
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Light aircraft, level at 5500', squawking 1200 VFR and overflying an air traffic area. I believed I was monitoring departure control, when in fact I had inadvertently misset audio sel panel and isolated communications for several mins. I then noticed a small biz jet beneath us, within approximately 200'. To the best of my knowledge both aircraft were apparently legal on their respective flight paths. The problem may have been departure control audio had been properly monitored and in addition had departure control not issued a vector to the biz jet in conflict with the VFR target.

Original NASA ASRS Text

Title: NMAC BETWEEN SMA X AND SMALL BIZJET NEAR MHT.

Narrative: LIGHT ACFT, LEVEL AT 5500', SQUAWKING 1200 VFR AND OVERFLYING AN ATA. I BELIEVED I WAS MONITORING DEP CTL, WHEN IN FACT I HAD INADVERTENTLY MISSET AUDIO SEL PANEL AND ISOLATED COMS FOR SEVERAL MINS. I THEN NOTICED A SMALL BIZ JET BENEATH US, WITHIN APPROX 200'. TO THE BEST OF MY KNOWLEDGE BOTH ACFT WERE APPARENTLY LEGAL ON THEIR RESPECTIVE FLT PATHS. THE PROB MAY HAVE BEEN DEP CTL AUDIO HAD BEEN PROPERLY MONITORED AND IN ADDITION HAD DEP CTL NOT ISSUED A VECTOR TO THE BIZ JET IN CONFLICT WITH THE VFR TARGET.

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.