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An SF340 captain reports inadvertently blocking ATC frequency 4 times due to raised position of push-to-talk yoke switch. Mainly on crosswind lndgs.
| Attributes | |
| ACN | 672802 |
| Time | |
| Date | 200509 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 672802 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
4 times in the last few months I have momentarily and inadvertently activated the push-to-talk button on the control wheel during crosswind lndgs over tower frequency. Each occurrence momentarily blocked tower frequency for from 1 second up to approximately 10 seconds. Each time this occurred as a result of a tight hand grip on the control wheel while executing a crosswind landing. I have attempted to lower my grip slightly; but then I am unable to access the control wheel trim switches. This occurs during the flare and rollout when a crosswind technique is used. The push-to-talk buttons on many of the saabs are raised rather than recessed; resulting in this scenario. Today we had 15 KTS and more of crosswind and it happened twice. Once ATC queried us if we had said something on frequency; once ATC said to another aircraft that they had been blocked; and the other times I could hear the carrier tone activate.
Original NASA ASRS Text
Title: AN SF340 CAPT RPTS INADVERTENTLY BLOCKING ATC FREQ 4 TIMES DUE TO RAISED POS OF PUSH-TO-TALK YOKE SWITCH. MAINLY ON XWIND LNDGS.
Narrative: 4 TIMES IN THE LAST FEW MONTHS I HAVE MOMENTARILY AND INADVERTENTLY ACTIVATED THE PUSH-TO-TALK BUTTON ON THE CTL WHEEL DURING XWIND LNDGS OVER TWR FREQ. EACH OCCURRENCE MOMENTARILY BLOCKED TWR FREQ FOR FROM 1 SECOND UP TO APPROX 10 SECONDS. EACH TIME THIS OCCURRED AS A RESULT OF A TIGHT HAND GRIP ON THE CTL WHEEL WHILE EXECUTING A XWIND LNDG. I HAVE ATTEMPTED TO LOWER MY GRIP SLIGHTLY; BUT THEN I AM UNABLE TO ACCESS THE CTL WHEEL TRIM SWITCHES. THIS OCCURS DURING THE FLARE AND ROLLOUT WHEN A XWIND TECHNIQUE IS USED. THE PUSH-TO-TALK BUTTONS ON MANY OF THE SAABS ARE RAISED RATHER THAN RECESSED; RESULTING IN THIS SCENARIO. TODAY WE HAD 15 KTS AND MORE OF XWIND AND IT HAPPENED TWICE. ONCE ATC QUERIED US IF WE HAD SAID SOMETHING ON FREQ; ONCE ATC SAID TO ANOTHER ACFT THAT THEY HAD BEEN BLOCKED; AND THE OTHER TIMES I COULD HEAR THE CARRIER TONE ACTIVATE.
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.