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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.
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.