<< >> NASA ASRS Report 912471, October 2010

Dash 8-100 captain reports a CDI discrepancy between his indicator and the first officers' with no flags during ILS approach to runway 26 at phl. A go-around is initiated.

Attributes
ACN	912471
Time
Date	201010
Local Time Of Day	0601-1200
Place
Locale Reference	PHL.Airport
State Reference	PA
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	ILS/VOR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On approach for runway 26 in phl there was a discrepancy with the localizer indications for the captain and the first officer. Inside of eskoe; the final approach fix; we noticed that the first officer's CDI was indicating left of course and the captain's was indicating right of course. The ceilings were not very low (around 500 ft); but considering the fact that parallel approaches were being conducted on runway 27R we decided to go-around. I was the plot flying and we did the normal go-around procedure. There were no flags or other non-normal indications.

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Original NASA ASRS Text

Title: Dash 8-100 Captain reports a CDI discrepancy between his indicator and the First Officers' with no flags during ILS approach to Runway 26 at PHL. A go-around is initiated.

Narrative: On approach for Runway 26 in PHL there was a discrepancy with the localizer indications for the Captain and the First Officer. Inside of ESKOE; the final approach fix; we noticed that the First Officer's CDI was indicating left of course and the Captain's was indicating right of course. The ceilings were not very low (around 500 FT); but considering the fact that parallel approaches were being conducted on Runway 27R we decided to go-around. I was the plot flying and we did the normal go-around procedure. There were no flags or other non-normal indications.

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.