Large transport has TCASII RA to descend at 1200 ft on takeoff. Levels off, RA stops.

Attributes
ACN	203463
Time
Date	199203
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : oak
State Reference	CA
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : oak
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 19000 flight time type : 120
ASRS Report	203463
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Departing oak, VMC, runway 29 with OAK4 departure. At about 1200 MSL received TCASII descend RA. Lowered nose to comply with pitch command and advised ATC. Advisory ceased almost immediately. ATC confirmed no known existing conflict and continued normal departure. Follow up comments from ATC indicated probable source was known IFR GA departure off north complex. Comments of personal opinion: there any many more of these irritant RA's occurring than current statistics indicate. This type RA has potential for disruption and harm. The same situation but operating in only TA provides the disruption but no benefit of possibly needed resolution, hence a quandary. These problems with TCASII will not be solved until ATC traffic control parameters and TCASII computer parameters are compatible. Passenger listening on channel 9 could become apprehensive. TCASII evolution is now in a stage similar to early GPWS. There is work yet to be done.

Original NASA ASRS Text

Title: LGT HAS TCASII RA TO DSND AT 1200 FT ON TKOF. LEVELS OFF, RA STOPS.

Narrative: DEPARTING OAK, VMC, RWY 29 WITH OAK4 DEP. AT ABOUT 1200 MSL RECEIVED TCASII DSND RA. LOWERED NOSE TO COMPLY WITH PITCH COMMAND AND ADVISED ATC. ADVISORY CEASED ALMOST IMMEDIATELY. ATC CONFIRMED NO KNOWN EXISTING CONFLICT AND CONTINUED NORMAL DEP. FOLLOW UP COMMENTS FROM ATC INDICATED PROBABLE SOURCE WAS KNOWN IFR GA DEP OFF N COMPLEX. COMMENTS OF PERSONAL OPINION: THERE ANY MANY MORE OF THESE IRRITANT RA'S OCCURRING THAN CURRENT STATISTICS INDICATE. THIS TYPE RA HAS POTENTIAL FOR DISRUPTION AND HARM. THE SAME SITUATION BUT OPERATING IN ONLY TA PROVIDES THE DISRUPTION BUT NO BENEFIT OF POSSIBLY NEEDED RESOLUTION, HENCE A QUANDARY. THESE PROBLEMS WITH TCASII WILL NOT BE SOLVED UNTIL ATC TFC CTL PARAMETERS AND TCASII COMPUTER PARAMETERS ARE COMPATIBLE. PAX LISTENING ON CHANNEL 9 COULD BECOME APPREHENSIVE. TCASII EVOLUTION IS NOW IN A STAGE SIMILAR TO EARLY GPWS. THERE IS WORK YET TO BE DONE.

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.