Flight crew of an medium large transport air carrier aircraft deviated from assigned altitude in res...

Attributes
ACN	247600
Time
Date	199307
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 4000 msl bound upper : 4300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
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 : 15410 flight time type : 10000
ASRS Report	247600
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe 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
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While being vectored for approach to bwi's runway 33 at 4000 ft, we received a TA on an aircraft at approximately 12 O'clock, 600 ft below, with a climbing trend. Almost immediately we received a climb RA. Around the same time the first officer got the high wing aircraft in sight. We had already started to climb. We then got a descent RA. We pushed over and started a descent when we got another climb RA. We finally went back to 9000 ft, our assigned altitude. The whole event took place in less than 2 mins, and during the event the TCASII never stopped issuing commands, reversing itself every time.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: WHILE BEING VECTORED FOR APCH TO BWI'S RWY 33 AT 4000 FT, WE RECEIVED A TA ON AN ACFT AT APPROX 12 O'CLOCK, 600 FT BELOW, WITH A CLBING TREND. ALMOST IMMEDIATELY WE RECEIVED A CLB RA. AROUND THE SAME TIME THE FO GOT THE HIGH WING ACFT IN SIGHT. WE HAD ALREADY STARTED TO CLB. WE THEN GOT A DSCNT RA. WE PUSHED OVER AND STARTED A DSCNT WHEN WE GOT ANOTHER CLB RA. WE FINALLY WENT BACK TO 9000 FT, OUR ASSIGNED ALT. THE WHOLE EVENT TOOK PLACE IN LESS THAN 2 MINS, AND DURING THE EVENT THE TCASII NEVER STOPPED ISSUING COMMANDS, REVERSING ITSELF EVERY TIME.

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 air carrier aircraft deviated from assigned altitude in response to a TCASII RA.