Altitude deviation altitude excursion from assigned in evasive action climb after TCASII RA.

Attributes
ACN	241022
Time
Date	199304
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bna
State Reference	TN
Altitude	msl bound lower : 10000 msl bound upper : 10600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bna
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 4000 flight time type : 200
ASRS Report	241022
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12500
ASRS Report	240032
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On descent TCASII TA alerted for aircraft 3 mi and 1000 ft below us and climbing. TCASII changed to RA directing a climb of 1500 FPM to an altitude of 10600 ft. Traffic was sighted passing right side of our aircraft 1/2 mi away at our altitude. RA went away and we descended back to our assigned altitude. Bna approach issued no advisories on traffic and voiced no concern about our altitude deviation. Traffic was climbing east into sun and probably never saw us. Aircraft was orange colored twin propeller with no air carrier markings. TCASII worked! Otherwise a much closer conflict/near miss may have occurred.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION FROM ASSIGNED IN EVASIVE ACTION CLB AFTER TCASII RA.

Narrative: ON DSCNT TCASII TA ALERTED FOR ACFT 3 MI AND 1000 FT BELOW US AND CLBING. TCASII CHANGED TO RA DIRECTING A CLB OF 1500 FPM TO AN ALT OF 10600 FT. TFC WAS SIGHTED PASSING R SIDE OF OUR ACFT 1/2 MI AWAY AT OUR ALT. RA WENT AWAY AND WE DSNDED BACK TO OUR ASSIGNED ALT. BNA APCH ISSUED NO ADVISORIES ON TFC AND VOICED NO CONCERN ABOUT OUR ALTDEV. TFC WAS CLBING E INTO SUN AND PROBABLY NEVER SAW US. ACFT WAS ORANGE COLORED TWIN PROP WITH NO ACR MARKINGS. TCASII WORKED! OTHERWISE A MUCH CLOSER CONFLICT/NEAR MISS MAY HAVE OCCURRED.

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.