Near midair collision with TCASII RA creating an altitude deviation altitude excursion.

Attributes
ACN	187538
Time
Date	199108
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bhm
State Reference	AL
Altitude	msl bound lower : 7000 msl bound upper : 7800
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bhm
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 4000
ASRS Report	187538
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac inflight encounter : vfr in imc non adherence : clearance non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were assigned 7000 ft. Approach control issued traffic at '6400 ft below'. Our TCASII gave us a TA. Later, TCASII gave us an RA command to climb. We climbed to approximately 7800 ft, TCASII commanded 'monitor vertical speed'. We leveled off. We advised approach control of our altitude deviation. We returned to 7000 ft. No further incident.

Original NASA ASRS Text

Title: NMAC WITH TCASII RA CREATING AN ALT DEV ALT EXCURSION.

Narrative: WE WERE ASSIGNED 7000 FT. APCH CTL ISSUED TFC AT '6400 FT BELOW'. OUR TCASII GAVE US A TA. LATER, TCASII GAVE US AN RA COMMAND TO CLB. WE CLBED TO APPROX 7800 FT, TCASII COMMANDED 'MONITOR VERT SPD'. WE LEVELED OFF. WE ADVISED APCH CTL OF OUR ALT DEV. WE RETURNED TO 7000 FT. NO FURTHER INCIDENT.

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.