Air carrier medium large transport reversed descent in response to TCASII RA.

Attributes
ACN	190435
Time
Date	199109
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 9800 msl bound upper : 10000
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	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 6000
ASRS Report	190435
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
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
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 300
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were cleared to 9000 ft. Descending through 10000 the TCASII gave us a TA on a VFR target, at 9800 ft it gave us an RA 'climb'. We then climbed back to 10000 when TCASII gave us a monitor vertical speed message followed by a clear of conflict message. Just as we were responding to the RA, approach control advised us of a TA for same traffic. This was their first radio contact with us after switching to their frequency, as they were too busy talking when we switched over to their frequency.

Original NASA ASRS Text

Title: ACR MLG REVERSED DSCNT IN RESPONSE TO TCASII RA.

Narrative: WE WERE CLRED TO 9000 FT. DSNDING THROUGH 10000 THE TCASII GAVE US A TA ON A VFR TARGET, AT 9800 FT IT GAVE US AN RA 'CLB'. WE THEN CLBED BACK TO 10000 WHEN TCASII GAVE US A MONITOR VERT SPD MESSAGE FOLLOWED BY A CLR OF CONFLICT MESSAGE. JUST AS WE WERE RESPONDING TO THE RA, APCH CTL ADVISED US OF A TA FOR SAME TFC. THIS WAS THEIR FIRST RADIO CONTACT WITH US AFTER SWITCHING TO THEIR FREQ, AS THEY WERE TOO BUSY TALKING WHEN WE SWITCHED OVER TO THEIR FREQ.

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.