Altitude deviation altitude excursion in flight crew response to TCASII RA.

Attributes
ACN	228091
Time
Date	199212
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 3656 flight time type : 1290
ASRS Report	228091
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
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 : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On arrival to dfw from dayton, oh, on the blue ridge 3 arrival, I was near the hamak intersection buj 230 degree radial/32 DME or approximately 11 mi from dfw on approximately the 030 degree radial when I reacted to a TCASII RA. An aircraft climbing out on departure was leveling-off at 10000 ft. We were at 11000 ft. As the other aircraft approached our altitude our TCASII issued a climb, climb, climb RA. The captain and I were suspicious of the validity of the RA, however, it was night IMC, so I began an autoplt climb until TCASII announced 'monitor vertical speed.' at that time I stopped the climb and began an autoplt descent staying out of the RA/vsi 'stay out of' area, until I leveled off again at 11000 ft. Regional approach made no mention of our altitude deviation, which may have been less than 300 ft. I suggest the captain advise ATC of our compliance with a TCASII RA, but he didn't think it was necessary. The solution to this problem is on the way, in the form of a modification to the TCASII computer program.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION IN FLC RESPONSE TO TCASII RA.

Narrative: ON ARR TO DFW FROM DAYTON, OH, ON THE BLUE RIDGE 3 ARR, I WAS NEAR THE HAMAK INTXN BUJ 230 DEG RADIAL/32 DME OR APPROX 11 MI FROM DFW ON APPROX THE 030 DEG RADIAL WHEN I REACTED TO A TCASII RA. AN ACFT CLBING OUT ON DEP WAS LEVELING-OFF AT 10000 FT. WE WERE AT 11000 FT. AS THE OTHER ACFT APCHED OUR ALT OUR TCASII ISSUED A CLB, CLB, CLB RA. THE CAPT AND I WERE SUSPICIOUS OF THE VALIDITY OF THE RA, HOWEVER, IT WAS NIGHT IMC, SO I BEGAN AN AUTOPLT CLB UNTIL TCASII ANNOUNCED 'MONITOR VERT SPD.' AT THAT TIME I STOPPED THE CLB AND BEGAN AN AUTOPLT DSCNT STAYING OUT OF THE RA/VSI 'STAY OUT OF' AREA, UNTIL I LEVELED OFF AGAIN AT 11000 FT. REGIONAL APCH MADE NO MENTION OF OUR ALTDEV, WHICH MAY HAVE BEEN LESS THAN 300 FT. I SUGGEST THE CAPT ADVISE ATC OF OUR COMPLIANCE WITH A TCASII RA, BUT HE DIDN'T THINK IT WAS NECESSARY. THE SOLUTION TO THIS PROBLEM IS ON THE WAY, IN THE FORM OF A MODIFICATION TO THE TCASII COMPUTER PROGRAM.

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.