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PIC of a charter flight temporarily loses communication with approach controller on frequency change due to low volume on receiver.
| Attributes | |
| ACN | 167606 |
| Time | |
| Date | 199012 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bur |
| State Reference | CA |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bur |
| Operator | general aviation : instructional |
| Make Model Name | Light Transport |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7700 flight time type : 30 |
| ASRS Report | 167606 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
En route and changed radio frequency and was unable to establish contact with approach. Checked circuit breaker's, microphone and speaker and audio panel couldn't locate problem. Switched radios and was able to establish communication but hearing of controller was very weak. Didn't think it was the volume control because it was preset and I never changed it, so I thought. After getting on the ground I realized I had accidentally bumped the volume control while changing the larger frequency knob. A poor design. Never have volume control and frequency knobs in such a close proximity. You might not think it would be a big deal especially if you were aware of it. But the incident was so insidious and strange that I felt compelled to write this report.
Original NASA ASRS Text
Title: PIC OF A CHARTER FLT TEMPORARILY LOSES COM WITH APCH CTLR ON FREQ CHANGE DUE TO LOW VOLUME ON RECEIVER.
Narrative: ENRTE AND CHANGED RADIO FREQ AND WAS UNABLE TO ESTABLISH CONTACT WITH APCH. CHKED CB'S, MIC AND SPEAKER AND AUDIO PANEL COULDN'T LOCATE PROB. SWITCHED RADIOS AND WAS ABLE TO ESTABLISH COM BUT HEARING OF CTLR WAS VERY WEAK. DIDN'T THINK IT WAS THE VOLUME CTL BECAUSE IT WAS PRESET AND I NEVER CHANGED IT, SO I THOUGHT. AFTER GETTING ON THE GND I REALIZED I HAD ACCIDENTALLY BUMPED THE VOLUME CTL WHILE CHANGING THE LARGER FREQ KNOB. A POOR DESIGN. NEVER HAVE VOLUME CTL AND FREQ KNOBS IN SUCH A CLOSE PROX. YOU MIGHT NOT THINK IT WOULD BE A BIG DEAL ESPECIALLY IF YOU WERE AWARE OF IT. BUT THE INCIDENT WAS SO INSIDIOUS AND STRANGE THAT I FELT COMPELLED TO WRITE THIS RPT.
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.