<< >> NASA ASRS Report 808085, October 2008

C172 CFI on IFR flight plan reports near midair collision with VFR traffic maneuvering on the airway. Evasive descent puts reporter in conflict with IFR twin below.

Attributes
ACN	808085
Time
Date	200810
Place
Locale Reference	intersection : angee
State Reference	FL
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma.artcc tower : zzz.tower
Operator	general aviation : personal
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute airway : v492.airway
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise : holding
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 230 flight time type : 95
ASRS Report	808085
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 150 vertical : 100
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While flying along V-492 on an IFR flight plan approximately 5 NM from angee intersection my student and I observed VFR traffic crossing our route ahead of us about a quarter of a mi. At this time I advised ATC that we had VFR traffic and reported the location of the aircraft. ATC advised me that it was maneuvering in the area. Then ATC advised me of IFR traffic below me. I continued to monitor the VFR traffic as it began to change to a parallel heading and losing altitude. The VFR aircraft then began to cross back across our flight route. I took control of the aircraft from the student and descended 100 ft. The closing rate of our aircraft began to increase as the VFR traffic turned back towards our aircraft. In order to avoid collision with the VFR traffic I immediately descended the aircraft an additional 300 ft. I observed a light twin aircraft heading towards our aircraft from the 11 O'clock position and below our altitude. I climbed the aircraft to create a greater separation from the light twin then advised ATC of what had occurred.

Related reports:

• Near midair collision between the reporter in an amateur bui...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: C172 CFI ON IFR FLIGHT PLAN REPORTS NMAC WITH VFR TRAFFIC MANEUVERING ON THE AIRWAY. EVASIVE DESCENT PUTS REPORTER IN CONFLICT WITH IFR TWIN BELOW.

Narrative: WHILE FLYING ALONG V-492 ON AN IFR FLT PLAN APPROX 5 NM FROM ANGEE INTXN MY STUDENT AND I OBSERVED VFR TFC XING OUR RTE AHEAD OF US ABOUT A QUARTER OF A MI. AT THIS TIME I ADVISED ATC THAT WE HAD VFR TFC AND RPTED THE LOCATION OF THE ACFT. ATC ADVISED ME THAT IT WAS MANEUVERING IN THE AREA. THEN ATC ADVISED ME OF IFR TFC BELOW ME. I CONTINUED TO MONITOR THE VFR TFC AS IT BEGAN TO CHANGE TO A PARALLEL HDG AND LOSING ALT. THE VFR ACFT THEN BEGAN TO CROSS BACK ACROSS OUR FLT RTE. I TOOK CTL OF THE ACFT FROM THE STUDENT AND DSNDED 100 FT. THE CLOSING RATE OF OUR ACFT BEGAN TO INCREASE AS THE VFR TFC TURNED BACK TOWARDS OUR ACFT. IN ORDER TO AVOID COLLISION WITH THE VFR TFC I IMMEDIATELY DSNDED THE ACFT AN ADDITIONAL 300 FT. I OBSERVED A LIGHT TWIN ACFT HDG TOWARDS OUR ACFT FROM THE 11 O'CLOCK POS AND BELOW OUR ALT. I CLBED THE ACFT TO CREATE A GREATER SEPARATION FROM THE LIGHT TWIN THEN ADVISED ATC OF WHAT HAD OCCURRED.

Data retrieved from NASA's ASRS site as of May 2009 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.