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A B737 crew discovered that when the new type handset, being installed in the B737 aircraft, is placed intentionally for accidental in the cup holder the chances of an open microphone exists.
| Attributes | |
| ACN | 538478 |
| Time | |
| Date | 200202 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mia.airport |
| State Reference | FL |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 538478 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Company Aircraft |
| Primary Problem | Company |
Narrative:
This report applies to the new handset mikes which are being installed on the B737. I knocked the microphone off its storage bracket and it fell into the cup holder. I noticed the microphone transmit button was now depressed resulting in a 'hot microphone' situation. The following day on preflight, I found a microphone stuck in the cup holder and once again transmitting. Crews should be warned that this may occur. Callback conversation with reporter revealed the following information: reporter revealed the new style microphone is designed operates well. However, its size and location make it vulnerable to falling into the cup holder, easily depressing its transmit button. The company has circulated a message, emphasizing the need to keep the microphone on its designed storage bracket.
Original NASA ASRS Text
Title: A B737 CREW DISCOVERED THAT WHEN THE NEW TYPE HANDSET, BEING INSTALLED IN THE B737 ACFT, IS PLACED INTENTIONALLY FOR ACCIDENTAL IN THE CUP HOLDER THE CHANCES OF AN OPEN MIKE EXISTS.
Narrative: THIS RPT APPLIES TO THE NEW HANDSET MIKES WHICH ARE BEING INSTALLED ON THE B737. I KNOCKED THE MIKE OFF ITS STORAGE BRACKET AND IT FELL INTO THE CUP HOLDER. I NOTICED THE MIKE XMIT BUTTON WAS NOW DEPRESSED RESULTING IN A 'HOT MIKE' SIT. THE FOLLOWING DAY ON PREFLT, I FOUND A MIKE STUCK IN THE CUP HOLDER AND ONCE AGAIN XMITTING. CREWS SHOULD BE WARNED THAT THIS MAY OCCUR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR REVEALED THE NEW STYLE MIKE IS DESIGNED OPERATES WELL. HOWEVER, ITS SIZE AND LOCATION MAKE IT VULNERABLE TO FALLING INTO THE CUP HOLDER, EASILY DEPRESSING ITS XMIT BUTTON. THE COMPANY HAS CIRCULATED A MESSAGE, EMPHASIZING THE NEED TO KEEP THE MIKE ON ITS DESIGNED STORAGE BRACKET.
Data retrieved from NASA's ASRS site as of July 2007 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.