Flight crew of an light transport air carrier aircraft climbed above assigned departure altitude in response to a TCASII RA.

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Attributes
ACN	251732
Time
Date	199309
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 1200
ASRS Report	251732
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was level at 4000 ft when departure advised me of traffic at 10 O'clock (moving to 4 O'clock) at 3500 ft. Traffic was idented as an light transport visually and on TCASII. My first officer advised ATC that we had the traffic in sight. Our TCASII advised us not to descend. Then our TCASII alerted us to climb through visual and aural commands (red arc up to 1500 FPM climb with the green arc from 1500 FPM to 2000 FPM). Assuming that the traffic had initiated a climb and because of the close proximity and being on a collision course I responded with a climb to 4800 ft. This did not please departure control. The controller obviously wanted us to stay at 4000 ft and maintain visual separation. Furthermore, he was surprised that we were TCASII equipped. Our company had failed to show this on our flight plan. Departure control was advised as soon as my first officer got a word in, as the frequency was very busy. ATC sent us back to 4000 ft. To the best of my knowledge, our deviation did not cause a traffic conflict.

Original NASA ASRS Text

Title: FLC OF AN LTT ACR ACFT CLBED ABOVE ASSIGNED DEP ALT IN RESPONSE TO A TCASII RA.

Narrative: I WAS LEVEL AT 4000 FT WHEN DEP ADVISED ME OF TFC AT 10 O'CLOCK (MOVING TO 4 O'CLOCK) AT 3500 FT. TFC WAS IDENTED AS AN LTT VISUALLY AND ON TCASII. MY FO ADVISED ATC THAT WE HAD THE TFC IN SIGHT. OUR TCASII ADVISED US NOT TO DSND. THEN OUR TCASII ALERTED US TO CLB THROUGH VISUAL AND AURAL COMMANDS (RED ARC UP TO 1500 FPM CLB WITH THE GREEN ARC FROM 1500 FPM TO 2000 FPM). ASSUMING THAT THE TFC HAD INITIATED A CLB AND BECAUSE OF THE CLOSE PROX AND BEING ON A COLLISION COURSE I RESPONDED WITH A CLB TO 4800 FT. THIS DID NOT PLEASE DEP CTL. THE CTLR OBVIOUSLY WANTED US TO STAY AT 4000 FT AND MAINTAIN VISUAL SEPARATION. FURTHERMORE, HE WAS SURPRISED THAT WE WERE TCASII EQUIPPED. OUR COMPANY HAD FAILED TO SHOW THIS ON OUR FLT PLAN. DEP CTL WAS ADVISED AS SOON AS MY FO GOT A WORD IN, AS THE FREQ WAS VERY BUSY. ATC SENT US BACK TO 4000 FT. TO THE BEST OF MY KNOWLEDGE, OUR DEV DID NOT CAUSE A TFC CONFLICT.

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.