<< >> NASA ASRS Report 613041, March 2004

Unauthorized airspace penetration and potential conflict between an outbound VFR GA aircraft and a descending MD88 on vectored arrival 10 mi west of dab, fl.

Attributes
ACN	613041
Time
Date	200403
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dab.airport
State Reference	FL
Altitude	msl bound lower : 1600 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dab.tracon
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 7l
Flight Phase	descent : holding descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : dab.tracon
Make Model Name	Small Aircraft
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : private pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 3000
ASRS Report	613041
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	airspace violation : entry altitude deviation : overshoot conflict : airborne critical non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued new clearance controller : separated traffic flight crew : took precautionary avoidance action
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

During radar vector to ILS approach runway 7L at dab received TCASII advisory on an aircraft 500 ft below us. We were on radar vector turn to base leg with clearance to descend through the conflicting aircraft's altitude. I (PNF) saw the aircraft. We appeared to be turning towards it with clearance to descend through its altitude. I immediately told the first officer to level off and stop the turn. Then I notified approach control of the visual sighting and TCASII alert. The controller told us to 'maintain visual separation.' moments later the controller assigned us an immediate turn to intercept the localizer. I am not aware of any loss of separation conflict, but assume the 'immediate turn' vector was to avoid a different aircraft. TCASII showed 500 ft vertical separation from the sighted aircraft. I assume the sighted aircraft was not under ATC control but do not know its status. It appeared to be a light single propeller aircraft of some sort.

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Original NASA ASRS Text

Title: UNAUTH AIRSPACE PENETRATION AND POTENTIAL CONFLICT BTWN AN OUTBOUND VFR GA ACFT AND A DSNDING MD88 ON VECTORED ARR 10 MI W OF DAB, FL.

Narrative: DURING RADAR VECTOR TO ILS APCH RWY 7L AT DAB RECEIVED TCASII ADVISORY ON AN ACFT 500 FT BELOW US. WE WERE ON RADAR VECTOR TURN TO BASE LEG WITH CLRNC TO DSND THROUGH THE CONFLICTING ACFT'S ALT. I (PNF) SAW THE ACFT. WE APPEARED TO BE TURNING TOWARDS IT WITH CLRNC TO DSND THROUGH ITS ALT. I IMMEDIATELY TOLD THE FO TO LEVEL OFF AND STOP THE TURN. THEN I NOTIFIED APCH CTL OF THE VISUAL SIGHTING AND TCASII ALERT. THE CTLR TOLD US TO 'MAINTAIN VISUAL SEPARATION.' MOMENTS LATER THE CTLR ASSIGNED US AN IMMEDIATE TURN TO INTERCEPT THE LOC. I AM NOT AWARE OF ANY LOSS OF SEPARATION CONFLICT, BUT ASSUME THE 'IMMEDIATE TURN' VECTOR WAS TO AVOID A DIFFERENT ACFT. TCASII SHOWED 500 FT VERT SEPARATION FROM THE SIGHTED ACFT. I ASSUME THE SIGHTED ACFT WAS NOT UNDER ATC CTL BUT DO NOT KNOW ITS STATUS. IT APPEARED TO BE A LIGHT SINGLE PROP ACFT OF SOME SORT.

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.