Flight crew of an medium large transport descended below assigned altitude in response to a TCASII R...

Attributes
ACN	293859
Time
Date	199501
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bna
State Reference	TN
Altitude	msl bound lower : 9500 msl bound upper : 10000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ric
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : bna
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer
ASRS Report	293859
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2250 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the arrival into bna we were descending to 10000 ft MSL when center advised of VFR traffic at 11 O'clock. In clouds until level at 10000 ft traffic showed up on TCASII at 10800 ft descending. Switched to approach control and they advised traffic was no factor. Picked up traffic visually. At that time altitude was 10600 ft descending with a converging flight path. We got a TCASII TA/RA to descend. Advised approach center on conflict and descended to approximately 9500 ft MSL after passing traffic we climbed back to 10000 ft MSL and continued the arrival.

Original NASA ASRS Text

Title: FLC OF AN MLG DSNDED BELOW ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: ON THE ARR INTO BNA WE WERE DSNDING TO 10000 FT MSL WHEN CTR ADVISED OF VFR TFC AT 11 O'CLOCK. IN CLOUDS UNTIL LEVEL AT 10000 FT TFC SHOWED UP ON TCASII AT 10800 FT DSNDING. SWITCHED TO APCH CTL AND THEY ADVISED TFC WAS NO FACTOR. PICKED UP TFC VISUALLY. AT THAT TIME ALT WAS 10600 FT DSNDING WITH A CONVERGING FLT PATH. WE GOT A TCASII TA/RA TO DSND. ADVISED APCH CTR ON CONFLICT AND DSNDED TO APPROX 9500 FT MSL AFTER PASSING TFC WE CLBED BACK TO 10000 FT MSL AND CONTINUED THE ARR.

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.

Flight crew of an medium large transport descended below assigned altitude in response to a TCASII RA.