Near midair collision. Instructor pilot in a C152 failed to direct his flying student to route their aircraft behind an approaching helicopter for the parallel runway to which they were crossing final as requested by the tower. The tower controller turned them away from final and subsequently sent them around in order to maintain adequate separation.

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Attributes
ACN	363833
Time
Date	199703
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hef
State Reference	VA
Altitude	msl bound lower : 1000 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : hef
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing : go around other
Flight Plan	None
Aircraft 2
Make Model Name	Helicopter
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 50 flight time total : 800 flight time type : 200
ASRS Report	363833
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After reporting a 2 mi right base for runway 16L, the tower instructed my students and I to pass behind a helicopter on final for runway 16R. Although we could not see the helicopter, we both assumed he was low and on short final. We also allowed ourselves to be distraction by our lesson objectives. Apparently, the helicopter was below but outside of our base. The tower, fearing that we were descending into his flight path, instructed us to turn left immediately to avoid a conflict. As we began our turn, we saw the helicopter pass below and in front of us. Our separation looked adequate, but the controller was obviously concerned. After we cleared the helicopter we asked the controller if she would like us to execute a 270 degree turn, but she declined. After some maneuvering to become re- established with final, she instructed us to go around, which we did.

Original NASA ASRS Text

Title: NMAC. INSTRUCTOR PLT IN A C152 FAILED TO DIRECT HIS FLYING STUDENT TO RTE THEIR ACFT BEHIND AN APCHING HELI FOR THE PARALLEL RWY TO WHICH THEY WERE XING FINAL AS REQUESTED BY THE TWR. THE TWR CTLR TURNED THEM AWAY FROM FINAL AND SUBSEQUENTLY SENT THEM AROUND IN ORDER TO MAINTAIN ADEQUATE SEPARATION.

Narrative: AFTER RPTING A 2 MI R BASE FOR RWY 16L, THE TWR INSTRUCTED MY STUDENTS AND I TO PASS BEHIND A HELI ON FINAL FOR RWY 16R. ALTHOUGH WE COULD NOT SEE THE HELI, WE BOTH ASSUMED HE WAS LOW AND ON SHORT FINAL. WE ALSO ALLOWED OURSELVES TO BE DISTR BY OUR LESSON OBJECTIVES. APPARENTLY, THE HELI WAS BELOW BUT OUTSIDE OF OUR BASE. THE TWR, FEARING THAT WE WERE DSNDING INTO HIS FLT PATH, INSTRUCTED US TO TURN L IMMEDIATELY TO AVOID A CONFLICT. AS WE BEGAN OUR TURN, WE SAW THE HELI PASS BELOW AND IN FRONT OF US. OUR SEPARATION LOOKED ADEQUATE, BUT THE CTLR WAS OBVIOUSLY CONCERNED. AFTER WE CLRED THE HELI WE ASKED THE CTLR IF SHE WOULD LIKE US TO EXECUTE A 270 DEG TURN, BUT SHE DECLINED. AFTER SOME MANEUVERING TO BECOME RE- ESTABLISHED WITH FINAL, SHE INSTRUCTED US TO GAR, WHICH WE DID.

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.