Near midair collision between a piper PA28 on a 1 mi localizer final and a bell 206 ranger helicopter traversing the final approach path from right to left. The tower gave a TA and the helicopter took evasive action by descending.

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Attributes
ACN	386006
Time
Date	199703
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ful
State Reference	CA
Altitude	msl bound lower : 1000 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ful
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee Arrow IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Jet Ranger/Kiowa/206
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach descent other
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : instructor
Qualification	other other : other pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 770 flight time type : 200
ASRS Report	386006
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 400 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

My instrument student and I were on the ful localizer approach on an IFR clearance. We were VMC, my student under the hood and on the controls and I had the runway in sight. Tower called traffic over the freeway to the south and I reported traffic in sight. The bell 206 helicopter continued crossing left to right and maintained altitude. We were on the non precision descent profile. I could see we were going to get close to the helicopter but expected him to maneuver below us. But the helicopter maintained course and speed until it was about at our 10 O'clock when I observed it make a large pitch change to descend below us. My student continued on the approach and since I could see that we would not collide, I did not take the controls and take any evasive action. This situation probably developed out of complacency on the part of the controller and the helicopter pilot because that helicopter operates daily out of that field and is given a lot of latitude. It just happened that this one time the helicopter failed to avoid the flow of fixed wing traffic.

Original NASA ASRS Text

Title: NMAC BTWN A PIPER PA28 ON A 1 MI LOC FINAL AND A BELL 206 RANGER HELI TRAVERSING THE FINAL APCH PATH FROM R TO L. THE TWR GAVE A TA AND THE HELI TOOK EVASIVE ACTION BY DSNDING.

Narrative: MY INST STUDENT AND I WERE ON THE FUL LOC APCH ON AN IFR CLRNC. WE WERE VMC, MY STUDENT UNDER THE HOOD AND ON THE CTLS AND I HAD THE RWY IN SIGHT. TWR CALLED TFC OVER THE FREEWAY TO THE S AND I RPTED TFC IN SIGHT. THE BELL 206 HELI CONTINUED XING L TO R AND MAINTAINED ALT. WE WERE ON THE NON PRECISION DSCNT PROFILE. I COULD SEE WE WERE GOING TO GET CLOSE TO THE HELI BUT EXPECTED HIM TO MANEUVER BELOW US. BUT THE HELI MAINTAINED COURSE AND SPD UNTIL IT WAS ABOUT AT OUR 10 O'CLOCK WHEN I OBSERVED IT MAKE A LARGE PITCH CHANGE TO DSND BELOW US. MY STUDENT CONTINUED ON THE APCH AND SINCE I COULD SEE THAT WE WOULD NOT COLLIDE, I DID NOT TAKE THE CTLS AND TAKE ANY EVASIVE ACTION. THIS SIT PROBABLY DEVELOPED OUT OF COMPLACENCY ON THE PART OF THE CTLR AND THE HELI PLT BECAUSE THAT HELI OPERATES DAILY OUT OF THAT FIELD AND IS GIVEN A LOT OF LATITUDE. IT JUST HAPPENED THAT THIS ONE TIME THE HELI FAILED TO AVOID THE FLOW OF FIXED WING TFC.

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.