Altitude deviation account TCASII RA to climb.

Attributes
ACN	189667
Time
Date	199109
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oak
State Reference	CA
Altitude	msl bound lower : 6000 msl bound upper : 6900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : private
Experience	flight time last 90 days : 250 flight time total : 16000 flight time type : 3000
ASRS Report	189667
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 700
Supplementary
Air Traffic Incident	other

Narrative:

While level at 6000 ft MSL, on a heading to intercept the oakland, ca, runway 29 ILS, we received a TCASII warning of a traffic conflict. After 5-10 seconds TCASII mandated an immediate climb. We initiated a climb and informed bay approach control. Passing 6300 we saw the twin engine traffic level at 5500 ft MSL going beneath us. We stopped climbing at 6900 ft MSL and then proceeded back down to our assigned altitude and then executed the approach. Later, after talking with approach on the telephone, the twin was restr to 5500 ft MSL and had us in sight during the entire occurrence. Approach never alerted us to conflicting traffic.

Original NASA ASRS Text

Title: ALT DEV ACCOUNT TCASII RA TO CLB.

Narrative: WHILE LEVEL AT 6000 FT MSL, ON A HDG TO INTERCEPT THE OAKLAND, CA, RWY 29 ILS, WE RECEIVED A TCASII WARNING OF A TFC CONFLICT. AFTER 5-10 SECONDS TCASII MANDATED AN IMMEDIATE CLB. WE INITIATED A CLB AND INFORMED BAY APCH CTL. PASSING 6300 WE SAW THE TWIN ENG TFC LEVEL AT 5500 FT MSL GOING BENEATH US. WE STOPPED CLBING AT 6900 FT MSL AND THEN PROCEEDED BACK DOWN TO OUR ASSIGNED ALT AND THEN EXECUTED THE APCH. LATER, AFTER TALKING WITH APCH ON THE TELEPHONE, THE TWIN WAS RESTR TO 5500 FT MSL AND HAD US IN SIGHT DURING THE ENTIRE OCCURRENCE. APCH NEVER ALERTED US TO CONFLICTING TFC.

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.