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A B777's VHF radio transmitters failed after 12 hours of flight time to a foreign destination. The VHF receivers worked acceptably.
| Attributes | |
| ACN | 714614 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | msl single value : 1000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 180 flight time total : 13000 flight time type : 600 |
| ASRS Report | 714614 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During preflight the captain noticed that the oxygen mask could not transmit. We notified maintenance of radio problem. Maintenance released aircraft. For over 12 hours all radios worked normal. When 30 mi from ZZZ2 on radar vectors; we noticed that all radios were unable to transmit and receive. Captain intercepted inbound arrival and flew airplane. We tried to troubleshoot radios. We made sure TCAS and terrain were working; we made sure to squawk 7600. We tried transmitting on XXX.X. We heard approach on XXX.X clear for approach and cleared us for landing. We continued. We never were able to transmit; but; had intermittent xmissions received. We did all checklists. We landed and cleared runway. We heard ground clear us to gate. We did and pilots went to the office in ZZZ2 and notified company and tower of what happened. We contacted dispatch also.
Original NASA ASRS Text
Title: A B777'S VHF RADIO XMITTERS FAILED AFTER 12 HRS OF FLT TIME TO A FOREIGN DEST. THE VHF RECEIVERS WORKED ACCEPTABLY.
Narrative: DURING PREFLT THE CAPT NOTICED THAT THE OXYGEN MASK COULD NOT XMIT. WE NOTIFIED MAINT OF RADIO PROB. MAINT RELEASED ACFT. FOR OVER 12 HRS ALL RADIOS WORKED NORMAL. WHEN 30 MI FROM ZZZ2 ON RADAR VECTORS; WE NOTICED THAT ALL RADIOS WERE UNABLE TO XMIT AND RECEIVE. CAPT INTERCEPTED INBOUND ARR AND FLEW AIRPLANE. WE TRIED TO TROUBLESHOOT RADIOS. WE MADE SURE TCAS AND TERRAIN WERE WORKING; WE MADE SURE TO SQUAWK 7600. WE TRIED XMITTING ON XXX.X. WE HEARD APCH ON XXX.X CLR FOR APCH AND CLRED US FOR LNDG. WE CONTINUED. WE NEVER WERE ABLE TO XMIT; BUT; HAD INTERMITTENT XMISSIONS RECEIVED. WE DID ALL CHKLISTS. WE LANDED AND CLRED RWY. WE HEARD GND CLR US TO GATE. WE DID AND PLTS WENT TO THE OFFICE IN ZZZ2 AND NOTIFIED COMPANY AND TWR OF WHAT HAPPENED. WE CONTACTED DISPATCH ALSO.
Data retrieved from NASA's ASRS site as of January 2009 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.