<< >> NASA ASRS Report 227343, November 1992

Small aircraft Y unauthorized VFR descent into TRSA had near midair collision with small aircraft X. Evasive action taken. Pilot deviation.

Attributes
ACN	227343
Time
Date	199211
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mcn
State Reference	GA
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl tracon : mcn
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 9
ASRS Report	227343
Person 2
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental controller : non radar
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	other
Consequence	faa : investigated
Miss Distance	horizontal : 300 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Small aircraft X cae mcn V323 euf mob was in the TRSA overflying. ZTL was providing VFR flight following to small aircraft Y VFR/105. I was working several aircraft into atl when the conflict alert sounded. I then observed small aircraft Y in my airspace, 1 mi away from small aircraft X converging. I immediately issued a traffic alert and advised small aircraft X 'traffic 11-12 O'clock less than a mi converging nwbound, altitude indicates 8000, advise you descend immediately and maintain 7000.' small aircraft X then said traffic insight. I advised my supervisor who called ZTL sinca sector to inquire what happened. ZTL advised there was training in progress and was there a problem? The supervisor informed my supervisor he'd check on it. My supervisor made no entry in the log and apparently neither did ZTL. As per FAA directive, all abnormal sits are required to be put in the log, but there seems to be an attitude of no harm done -- why bother. The ZTL controller providing OJT apparently didn't observe the aircraft descend or the pilot didn't report he was descending.

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Original NASA ASRS Text

Title: SMA Y UNAUTH VFR DSCNT INTO TRSA HAD NMAC WITH SMA X. EVASIVE ACTION TAKEN. PLTDEV.

Narrative: SMA X CAE MCN V323 EUF MOB WAS IN THE TRSA OVERFLYING. ZTL WAS PROVIDING VFR FLT FOLLOWING TO SMA Y VFR/105. I WAS WORKING SEVERAL ACFT INTO ATL WHEN THE CONFLICT ALERT SOUNDED. I THEN OBSERVED SMA Y IN MY AIRSPACE, 1 MI AWAY FROM SMA X CONVERGING. I IMMEDIATELY ISSUED A TFC ALERT AND ADVISED SMA X 'TFC 11-12 O'CLOCK LESS THAN A MI CONVERGING NWBOUND, ALT INDICATES 8000, ADVISE YOU DSND IMMEDIATELY AND MAINTAIN 7000.' SMA X THEN SAID TFC INSIGHT. I ADVISED MY SUPVR WHO CALLED ZTL SINCA SECTOR TO INQUIRE WHAT HAPPENED. ZTL ADVISED THERE WAS TRAINING IN PROGRESS AND WAS THERE A PROB? THE SUPVR INFORMED MY SUPVR HE'D CHK ON IT. MY SUPVR MADE NO ENTRY IN THE LOG AND APPARENTLY NEITHER DID ZTL. AS PER FAA DIRECTIVE, ALL ABNORMAL SITS ARE REQUIRED TO BE PUT IN THE LOG, BUT THERE SEEMS TO BE AN ATTITUDE OF NO HARM DONE -- WHY BOTHER. THE ZTL CTLR PROVIDING OJT APPARENTLY DIDN'T OBSERVE THE ACFT DSND OR THE PLT DIDN'T RPT HE WAS DSNDING.

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.