EMB145 captain reports autopilot deviations right and left of course while tracking the localizer and glideslope for runway 18R at clt. The aircraft ended up too close to runway 18C and was vectored around for another approach and the autopilot was not used.

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Attributes
ACN	1151761
Time
Date	201402
Local Time Of Day	1201-1800
Place
Locale Reference	CLT.Airport
State Reference	NC
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

We we're establish on the appraoch to runway 18R when the autopilot did a hard right turn then a hard left turn and then we were off course for the appraoch. ATC vectored us around and landed. Autopilot malfunction.

Original NASA ASRS Text

Title: EMB145 Captain reports autopilot deviations right and left of course while tracking the localizer and glideslope for Runway 18R at CLT. The aircraft ended up too close to Runway 18C and was vectored around for another approach and the autopilot was not used.

Narrative: We we're establish on the appraoch to Runway 18R when the autopilot did a hard right turn then a hard left turn and then we were off course for the appraoch. ATC vectored us around and landed. Autopilot malfunction.

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.