CRJ700 first officer experiences a localizer deviation with the autopilot engaged that is brought to...

Narrative:

Coming in on approach to [runway] 26L; the air traffic controller asked us if we were on course. I said we were intercepted. At the same moment I noticed the localizer deflected 1/2 deflection; and said we were correcting back on course. The captain kicked off the autopilot and got us on course the rest of the way. We had the right frequency in the whole time. After getting on the ground; the captain and I had maintenance check the localizer signal because the FMA showed the localizer as captured; but we noticed the needle went half a deflection. Maintenance said he had other crew with localizer issues at iah airport previously. The localizer showed intercepted on the FMA; so we weren't sure why the localizer deflected. We might have been able to correct the course sooner; but we noticed the localizer deflection; while captured; as the controller mentioned it to us. Monitor the localizer and correct sooner.

Original NASA ASRS Text

Title: CRJ700 First Officer experiences a localizer deviation with the autopilot engaged that is brought to the crew's attention by IAH Tower. The autopilot is disengaged and the approach is manually flown to landing.

Narrative: Coming in on approach to [Runway] 26L; the Air Traffic Controller asked us if we were on course. I said we were intercepted. At the same moment I noticed the localizer deflected 1/2 deflection; and said we were correcting back on course. The Captain kicked off the autopilot and got us on course the rest of the way. We had the right frequency in the whole time. After getting on the ground; the Captain and I had Maintenance check the localizer signal because the FMA showed the localizer as captured; but we noticed the needle went half a deflection. Maintenance said he had other crew with localizer issues at IAH airport previously. The localizer showed intercepted on the FMA; so we weren't sure why the localizer deflected. We might have been able to correct the course sooner; but we noticed the localizer deflection; while captured; as the Controller mentioned it to us. Monitor the localizer and correct sooner.

Data retrieved from NASA's ASRS site as of July 2013 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	1007441
Time
Date	201204
Local Time Of Day	0601-1200
Place
Locale Reference	IAH.Airport
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	ILS/VOR
Person 1
Function	First Officer Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Track / Heading All Types

CRJ700 first officer experiences a localizer deviation with the autopilot engaged that is brought to the crew's attention by iah tower. The autopilot is disengaged and the approach is manually flown to landing.