Despite complying with all required remediary procedures; B757 flight crew experiences loss of transition waypoints while flying the clare RNAV SID from dfw.

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Attributes
ACN	696564
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : poten
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	696564
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

We were given CLARE2 departure runway 17R out of dfw. Performed all procedures prior to departure (route check; leg check; and quick align at end of runway 17R). After takeoff; engaged LNAV and aircraft performed as expected. After poten; aircraft started turn towards swb. Tekbe had somehow been dropped from route. ATC immediately noticed our turn and asked if we were going to tekbe. We corrected back without incident. ATC even said tekbe seemed to be frequently dropped from the SID.

Original NASA ASRS Text

Title: DESPITE COMPLYING WITH ALL REQUIRED REMEDIARY PROCS; B757 FLT CREW EXPERIENCES LOSS OF TRANSITION WAYPOINTS WHILE FLYING THE CLARE RNAV SID FROM DFW.

Narrative: WE WERE GIVEN CLARE2 DEP RWY 17R OUT OF DFW. PERFORMED ALL PROCS PRIOR TO DEP (RTE CHK; LEG CHK; AND QUICK ALIGN AT END OF RWY 17R). AFTER TKOF; ENGAGED LNAV AND ACFT PERFORMED AS EXPECTED. AFTER POTEN; ACFT STARTED TURN TOWARDS SWB. TEKBE HAD SOMEHOW BEEN DROPPED FROM RTE. ATC IMMEDIATELY NOTICED OUR TURN AND ASKED IF WE WERE GOING TO TEKBE. WE CORRECTED BACK WITHOUT INCIDENT. ATC EVEN SAID TEKBE SEEMED TO BE FREQUENTLY DROPPED FROM THE SID.

Data retrieved from NASA's ASRS site as of January 2009 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.