B737-800 flight crew reports track deviation on the cowby 2 RNAV departure out of las. Waypoints roppr and ceasr are eliminated and aircraft attempts to fly direct hitme after rbell.

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Attributes
ACN	762884
Time
Date	200711
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : cowby
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 3000
ASRS Report	762884
Person 2
Affiliation	government : faa
Function	controller : departure
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

On departure (runway 25R) flying the cowby 2 SID; after passing the rbell intersection; the FMS directed a turn (left) to hitme intersection. Shortly after making the turn I noticed that the 2 intermediate waypoints were no longer there. About that time departure control queried as to where we were going. I asked for a heading and we were subsequently vectored to a downline fix and we continued on with no further complications. As we discussed the event; we both preflted the route and both remember all the fixes being loaded into the route (as they had crossing restrs) and the fixes that were missing on departure were in the route during preflight. Neither pilot modified the route (the clearance was 'as filed'). It is still unknown why the waypoints (roppr and ceasr) omitted on the departure routing.

Original NASA ASRS Text

Title: B737-800 FLT CREW REPORTS TRACK DEV ON THE COWBY 2 RNAV DEPARTURE OUT OF LAS. WAYPOINTS ROPPR AND CEASR ARE ELIMINATED AND ACFT ATTEMPTS TO FLY DIRECT HITME AFTER RBELL.

Narrative: ON DEP (RWY 25R) FLYING THE COWBY 2 SID; AFTER PASSING THE RBELL INTXN; THE FMS DIRECTED A TURN (L) TO HITME INTXN. SHORTLY AFTER MAKING THE TURN I NOTICED THAT THE 2 INTERMEDIATE WAYPOINTS WERE NO LONGER THERE. ABOUT THAT TIME DEP CTL QUERIED AS TO WHERE WE WERE GOING. I ASKED FOR A HDG AND WE WERE SUBSEQUENTLY VECTORED TO A DOWNLINE FIX AND WE CONTINUED ON WITH NO FURTHER COMPLICATIONS. AS WE DISCUSSED THE EVENT; WE BOTH PREFLTED THE RTE AND BOTH REMEMBER ALL THE FIXES BEING LOADED INTO THE RTE (AS THEY HAD XING RESTRS) AND THE FIXES THAT WERE MISSING ON DEP WERE IN THE RTE DURING PREFLT. NEITHER PLT MODIFIED THE RTE (THE CLRNC WAS 'AS FILED'). IT IS STILL UNKNOWN WHY THE WAYPOINTS (ROPPR AND CEASR) OMITTED ON THE DEP ROUTING.

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.