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Flight crew of MD80 lost communication on departure. Inadvertently squawked 7500. Re-established intermittent communication on observer's radio, and proceeded to destination.
| Attributes | |
| ACN | 577361 |
| Time | |
| Date | 200303 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ttt.vor |
| State Reference | TX |
| Altitude | msl single value : 13000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon tracon : act.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : joe pool |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| ASRS Report | 577361 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 577360 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
On climb out of dfw, we lost communications. Our last assigned altitude was 13000 ft. We leveled at 13000 ft, and assessed the problem. My push-to-talk on the right yoke had broken. The microphone was stuck hot, and we had no way of communicating. We continued the joe pool department, I became the PF. We entered the wrong squawk code. Instead of 7600 we entered 7500 by mistake. The captain was able to establish communication with the observers communication panel and microphone. By ACARS we were notified that we were code 7500. We switched to 7600 and told waco approach that we had no 7500, just lost communication on the main radios. Our communication, using the observer's panel, faded in and out, and was only audible on the first officer speaker. We established communication with destination airport, and landed uneventfully. Maintenance found the push-to-talk shorted and an inoperative first officer radio panel.
Original NASA ASRS Text
Title: FLT CREW OF MD80 LOST COM ON DEP. INADVERTENTLY SQUAWKED 7500. RE-ESTABLISHED INTERMITTENT COM ON OBSERVER'S RADIO, AND PROCEEDED TO DEST.
Narrative: ON CLBOUT OF DFW, WE LOST COMS. OUR LAST ASSIGNED ALT WAS 13000 FT. WE LEVELED AT 13000 FT, AND ASSESSED THE PROB. MY PUSH-TO-TALK ON THE R YOKE HAD BROKEN. THE MIKE WAS STUCK HOT, AND WE HAD NO WAY OF COMMUNICATING. WE CONTINUED THE JOE POOL DEPT, I BECAME THE PF. WE ENTERED THE WRONG SQUAWK CODE. INSTEAD OF 7600 WE ENTERED 7500 BY MISTAKE. THE CAPT WAS ABLE TO ESTABLISH COM WITH THE OBSERVERS COM PANEL AND MIKE. BY ACARS WE WERE NOTIFIED THAT WE WERE CODE 7500. WE SWITCHED TO 7600 AND TOLD WACO APCH THAT WE HAD NO 7500, JUST LOST COM ON THE MAIN RADIOS. OUR COM, USING THE OBSERVER'S PANEL, FADED IN AND OUT, AND WAS ONLY AUDIBLE ON THE FO SPEAKER. WE ESTABLISHED COM WITH DEST ARPT, AND LANDED UNEVENTFULLY. MAINT FOUND THE PUSH-TO-TALK SHORTED AND AN INOP FO RADIO PANEL.
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.