Before takeoff; flight crew received a late runway change to 34L at den. Reloading the FMS caused so...

Narrative:

RNAV departure 34L. We got our clearance via pre departure clearance through ACARS. There was an amendment to the route and my first officer plugged it in. It was minor by adding chici fix then dehli after yokes. We taxied out to the west for the 34's. My first officer had put in 34R for our dep runway. Traffic was moving pretty smoothly with quick departures going ground assigned us 34L and we taxied to the runway. After second engine start and taxi checklist completed we were about to rwy 34L. As we were cleared to line up and wait we noticed our needle not centered and then realized 34R was still in. My first officer changed runway to 34L and activated. We verified it was correct and the first fix on the yokes was iriis and the remainder of the yokes departure. At this time we were cleared for takeoff up to 10;000 RNAV to iriis. All was well on the departure then we were cleared to FL230. It was a typical light chop turbulence on the climb with IMC conditions. It was on the climb after iriis that ATC asked where we were heading. I was working the radios and told them KP78C fix. He asked if we'd been assigned that by previous ATC. We said no; at that time realizing that the other fixes had kicked out of the FMS navigation for some reason. He replied to us that this has been a frequent issue and then gave us a new direct to fix. It sounded like he gave us a fix that we'd had just passed by..chicn..actually he gave us chici which was just a bit further down the departure. We both thought we heard him say the chicn and not chici. It was a little confusing and were giving a higher altitude and a heading. I had mentioned to him (ATC) that it may have kicked out when we did a runway change right before departure. He again said it was happening quite often and that the departure would be changed effective [in a week]. He then gave us direct to our destination and then gave me a number to call when on the ground. I called and talked to the supervisor. He was nice and helpful and took my information. He also said the departure was changing and for some reason many issues with flight plans kicking out on this particular SID. That was the end of the day for myself and crew. No other issues happened after that.

Original NASA ASRS Text

Title: Before takeoff; flight crew received a late runway change to 34L at DEN. Reloading the FMS caused some amended waypoints to drop out of the flight plan which resulted in an incorrect track during climb out.

Narrative: RNAV departure 34L. We got our clearance via PDC through ACARS. There was an amendment to the route and my FO plugged it in. It was minor by adding CHICI fix then DEHLI after YOKES. We taxied out to the west for the 34's. My FO had put in 34R for our dep runway. Traffic was moving pretty smoothly with quick departures going ground assigned us 34L and we taxied to the runway. After second engine start and taxi checklist completed we were about to Rwy 34L. As we were cleared to line up and wait we noticed our needle not centered and then realized 34R was still in. My FO changed runway to 34L and activated. We verified it was correct and the first fix on the YOKES was IRIIS and the remainder of the YOKES departure. At this time we were cleared for takeoff up to 10;000 RNAV to IRIIS. All was well on the departure then we were cleared to FL230. It was a typical light chop turbulence on the climb with IMC conditions. It was on the climb after IRIIS that ATC asked where we were heading. I was working the radios and told them KP78C fix. He asked if we'd been assigned that by previous ATC. We said no; at that time realizing that the other fixes had kicked out of the FMS navigation for some reason. He replied to us that this has been a frequent issue and then gave us a new direct to fix. It sounded like he gave us a fix that we'd had just passed by..CHICN..actually he gave us CHICI which was just a bit further down the departure. We both thought we heard him say the CHICN and not CHICI. It was a little confusing and were giving a higher altitude and a heading. I had mentioned to him (ATC) that it may have kicked out when we did a runway change right before departure. He again said it was happening quite often and that the departure would be changed effective [in a week]. He then gave us direct to our destination and then gave me a number to call when on the ground. I called and talked to the supervisor. He was nice and helpful and took my information. He also said the departure was changing and for some reason many issues with flight plans kicking out on this particular SID. That was the end of the day for myself and crew. No other issues happened after that.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1342759
Time
Date	201603
Local Time Of Day	1801-2400
Place
Locale Reference	DEN.Airport
State Reference	CO
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	Medium Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Other RNAV Departure
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Before takeoff; flight crew received a late runway change to 34L at den. Reloading the FMS caused some amended waypoints to drop out of the flight plan which resulted in an incorrect track during climb out.