<< >> NASA ASRS Report 1075929, March 2013

B737-700 flight crew overshoots the localizer course during approach and discovers the #2 navigation has the ILS frequency in the stby position. A go around is initiated and the second attempt is successful. On a subsequent flight leg it is discovered that the #2 navigation radio could switch from active to stby without depressing the tfr switch.

Attributes
ACN	1075929
Time
Date	201303
Local Time Of Day	0001-0600
Place
Locale Reference	PHL.Airport
State Reference	PA
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	ILS/VOR
Person 1
Function	Captain
Experience	Flight Crew Last 90 Days 171
Person 2
Function	First Officer
Experience	Flight Crew Last 90 Days 208
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

While being vectored to join ILS 27R; the aircraft/crew failed to capture/join the localizer. We then turned back toward the localizer and realized the #2 navigation had the localizer frequency in stby. The crew opted to break off approach. Crew completed descent checklist; re-briefed approach; and flew the ILS 27R. During the next flight; the crew noticed that the #2 navigation would switch from stby to active without depressing the tfr switch. A logbook entry was made noting the discrepancy and a mechanic was briefed. I am certain we properly briefed the approach prior to flying the procedure. What is not known is if the #2 navigation switched to the stby frequency or if the crew made a verification error. In the future; I will try to crosscheck the frequency selected while on the base vector.

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Original NASA ASRS Text

Title: B737-700 flight crew overshoots the LOC course during approach and discovers the #2 NAV has the ILS frequency in the STBY position. A go around is initiated and the second attempt is successful. On a subsequent flight leg it is discovered that the #2 NAV radio could switch from ACTIVE to STBY without depressing the TFR switch.

Narrative: While being vectored to join ILS 27R; the aircraft/crew failed to capture/join the LOC. We then turned back toward the LOC and realized the #2 NAV had the LOC frequency in STBY. The crew opted to break off approach. Crew completed Descent Checklist; re-briefed approach; and flew the ILS 27R. During the next flight; the crew noticed that the #2 NAV would switch from STBY to ACTIVE without depressing the TFR switch. A logbook entry was made noting the discrepancy and a Mechanic was briefed. I am certain we properly briefed the approach prior to flying the procedure. What is not known is if the #2 NAV switched to the STBY frequency or if the crew made a verification error. In the future; I will try to crosscheck the frequency selected while on the base vector.

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.