A B737-400 flight crew flying a clt RNAV departure off runway 18L to hisor intersection suffered an ...

Attributes
ACN	988315
Time
Date	201112
Local Time Of Day	0601-1200
Place
Locale Reference	CLT.Tower
State Reference	NC
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	Climb Initial Climb
Route In Use	SID CLT RNAV
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Initial Climb
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Departed 18L at clt. All pre-takeoff procedures were accomplished; including route verification; runway verification and runway update. LNAV was engaged at 400 AGL. Autopilot was engaged just after 1;000 AGL. Aircraft began a right turn; which I initially assumed was a crosswind correction. I cleared outside for traffic and it appeared we were drifting right of course. I checked back inside to confirm this and the CDI indicated we were on course with a bearing to hisor of 193 degrees. I cleared outside again and saw an aircraft; which had departed 18C converging with us. Our aircraft began a left turn either as a course correction or as a turn for the next fix as we received a traffic advisory from the TCAS. A few seconds later tower issued an immediate left turn command. We proceeded to our destination with no further issues. Enroute we checked the navigation accuracy page and could find nothing wrong.

Original NASA ASRS Text

Title: A B737-400 flight crew flying a CLT RNAV departure off Runway 18L to HISOR intersection suffered an apparent track deviation and traffic conflict with a departure off Runway 18C prior to reaching HISOR.

Narrative: Departed 18L at CLT. All pre-takeoff procedures were accomplished; including route verification; runway verification and runway update. LNAV was engaged at 400 AGL. Autopilot was engaged just after 1;000 AGL. Aircraft began a right turn; which I initially assumed was a crosswind correction. I cleared outside for traffic and it appeared we were drifting right of course. I checked back inside to confirm this and the CDI indicated we were on course with a bearing to HISOR of 193 degrees. I cleared outside again and saw an aircraft; which had departed 18C converging with us. Our aircraft began a left turn either as a course correction or as a turn for the next fix as we received a Traffic Advisory from the TCAS. A few seconds later Tower issued an immediate left turn command. We proceeded to our destination with no further issues. Enroute we checked the NAV accuracy page and could find nothing wrong.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-400 flight crew flying a clt RNAV departure off runway 18L to hisor intersection suffered an apparent track deviation and traffic conflict with a departure off runway 18C prior to reaching hisor.