A B737-700 deviated right of the bur runway 8 ILS localizer at 1;000' in an uncommanded 10-15 degree...

Attributes
ACN	839338
Time
Date	200906
Local Time Of Day	1201-1800
Place
Locale Reference	BUR.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	ILS/VOR
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 303 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Track / Heading All Types Inflight Event / Encounter Other / Unknown

Narrative:

ILS to runway 8; a note on the approach plate states guidance is unusable inside da. Approach was commenced using a company procedure autopilot approach. Airport visual was achieved at 1200' MSL and at 1100' MSL the aircraft started a 10-15 degree bank turn to the right placing aircraft a good two-three runway widths south of the actual runway; yet the flight director showed perfectly on course and on glide path. At 1000 ft MSL I cancelled autopilot and flew aircraft back north to runway centerline for a normal landing; noting ILS appeared to be displaying inaccurate information.

Original NASA ASRS Text

Title: A B737-700 deviated right of the BUR Runway 8 ILS localizer at 1;000' in an uncommanded 10-15 degree bank. The flight director remained on track and glide path.

Narrative: ILS to Runway 8; a note on the approach plate states guidance is unusable inside DA. Approach was commenced using a company procedure autopilot approach. Airport visual was achieved at 1200' MSL and at 1100' MSL the aircraft started a 10-15 degree bank turn to the right placing aircraft a good two-three runway widths south of the actual runway; yet the flight director showed perfectly on course and on glide path. At 1000 FT MSL I cancelled autopilot and flew aircraft back north to runway centerline for a normal landing; noting ILS appeared to be displaying inaccurate information.

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 B737-700 deviated right of the bur runway 8 ILS localizer at 1;000' in an uncommanded 10-15 degree bank. The flight director remained on track and glide path.