B737 crew reports overshooting the runway 24R localizer course during approach due to failure of the...

Narrative:

On approach to 24R at lax; the aircraft was northeast of the FAF; level at 2;500 ft MSL; and given a heading of 200 to intercept the final approach course (249). The ILS's were both tuned to the correct frequency and the aircraft EFIS panel VOR/ILS was selected as the crew anticipated a right turn from the autopilot once the localizer was captured. At this time; the flight crew began configuring the aircraft and slowing down. While the gear was in transit (I recall the noise being an issue); the captain remarked that his CDI quickly swung from left to right indicating we had gone through the course. However; the copilot's CDI still indicated we had not passed the localizer course. Seeing this discrepancy; the first officer began a turn to the right to avoid crossing the southern approach courses (should the captain's CDI indications be valid). During the turn; the tower warned us that we were left of course. At this point; the crew obtained a visual on 24R and transitioned to a visual approach. During the visual approach; de-tuning and retuning the first officer's ILS frequency caused flags to appear throughout the remainder of the approach. This malfunction of the ILS receiver was a repeat gripe that had been MEL'd.

Original NASA ASRS Text

Title: B737 crew reports overshooting the Runway 24R LOC course during approach due to failure of the First Officer's ILS receiver.

Narrative: On approach to 24R at LAX; the aircraft was northeast of the FAF; level at 2;500 FT MSL; and given a heading of 200 to intercept the final approach course (249). The ILS's were both tuned to the correct frequency and the aircraft EFIS panel VOR/ILS was selected as the crew anticipated a right turn from the autopilot once the Localizer was captured. At this time; the flight crew began configuring the aircraft and slowing down. While the gear was in transit (I recall the noise being an issue); the Captain remarked that his CDI quickly swung from left to right indicating we had gone through the course. However; the Copilot's CDI still indicated we had not passed the Localizer course. Seeing this discrepancy; the First Officer began a turn to the right to avoid crossing the southern approach courses (should the Captain's CDI indications be valid). During the turn; the Tower warned us that we were left of course. At this point; the Crew obtained a visual on 24R and transitioned to a visual approach. During the visual approach; de-tuning and retuning the First Officer's ILS frequency caused flags to appear throughout the remainder of the approach. This malfunction of the ILS receiver was a repeat gripe that had been MEL'd.

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.

Attributes
ACN	915130
Time
Date	201010
Local Time Of Day	0601-1200
Place
Locale Reference	SCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	ILS/VOR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 123 Flight Crew Type 123
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

B737 crew reports overshooting the runway 24R localizer course during approach due to failure of the first officer's ILS receiver.