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A B737 ng captain reported that a new three position push to talk microphone switch stuck in flight causing a hot microphone.
| Attributes | |
| ACN | 973348 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Microphone |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 169 Flight Crew Type 20000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Ptt switch malfunctioned enroute causing a hot microphone in all three positions. Replace the new three-position ptt switch back to the old style and relocate the hot microphone switch to the audio control panel. I've had numerous problems with these new switches ranging from this to being installed upside down.
Original NASA ASRS Text
Title: A B737 NG Captain reported that a new three position push to talk microphone switch stuck in flight causing a hot microphone.
Narrative: PTT switch malfunctioned enroute causing a hot MIC in all three positions. Replace the new three-position PTT switch back to the old style and relocate the hot MIC switch to the audio control panel. I've had numerous problems with these new switches ranging from this to being installed upside down.
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.