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Pilot experienced intermittent xmissions on unicom frequency. Another aircraft maneuvered to provide separation in an uncontrolled airport traffic pattern.
| Attributes | |
| ACN | 431150 |
| Time | |
| Date | 199903 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : brl.airport |
| State Reference | IA |
| Altitude | msl bound lower : 1500 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : traffic pattern |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Route In Use | approach : visual |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 20 flight time total : 1102 flight time type : 111 |
| ASRS Report | 431150 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa other flight crewb other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Flew north from eok to brl at 3500 ft, entering a right downwind at a 45 degree for runway 18 at brl. Called to unicom about 8 mi south for advisory and heard no reply (already had listened to ASOS: winds 210 degrees at 12 KTS, altimeter 30.10). Called pattern entry above about 2 or 3 mi south, then 'midfield right downwind,' and 'base to final' turn (all for runway 18). On base, saw commuter on about a 1 mi straight-in final for runway 18, but already beginning to climb a bit and start a turn toward the west. Continued for landing while the commuter apparently did a right 360 degree turn and then landed after I had called 'clear of runway 18' and was approaching the ramp. Line guy came over after shutdown and indicated that the commuter had been trying to make radio contact on unicom but had not heard any answer. Checked the radio and verified that transmit was set to #2 communication, the audio panel to 'automatic,' and the communication itself to 123.0, the brl unicom frequency. Line guy said he had heard only my first transmission but not any subsequent ones. (When, on departure, checked #2 radio, it was ok, but #1 was reported 'much better.' used #2 for entire trip back to msn as a test, however, including flight following from mli, rfd, and msn, with no apparent or reported difficulty.) went over and talked with commuter captain and first officer, apologized for their need to go around (since I would have deferred to a scheduled carrier as a courtesy), and tried to figure out with them what had happened. They indicated that they had heard all my radio calls (unlike the line guy) so they knew my location throughout, but had been unable to establish contact with me. Captain commented I had 'done right' because I 'kept broadcasting my position.' first officer said they also had me on TCASII 'intermittently.' both seemed to take the go around in stride, though first officer noted I should be sure to check the radios on departure.
Original NASA ASRS Text
Title: PLT EXPERIENCED INTERMITTENT XMISSIONS ON UNICOM FREQ. ANOTHER ACFT MANEUVERED TO PROVIDE SEPARATION IN AN UNCTLED ARPT TFC PATTERN.
Narrative: FLEW N FROM EOK TO BRL AT 3500 FT, ENTERING A R DOWNWIND AT A 45 DEG FOR RWY 18 AT BRL. CALLED TO UNICOM ABOUT 8 MI S FOR ADVISORY AND HEARD NO REPLY (ALREADY HAD LISTENED TO ASOS: WINDS 210 DEGS AT 12 KTS, ALTIMETER 30.10). CALLED PATTERN ENTRY ABOVE ABOUT 2 OR 3 MI S, THEN 'MIDFIELD R DOWNWIND,' AND 'BASE TO FINAL' TURN (ALL FOR RWY 18). ON BASE, SAW COMMUTER ON ABOUT A 1 MI STRAIGHT-IN FINAL FOR RWY 18, BUT ALREADY BEGINNING TO CLB A BIT AND START A TURN TOWARD THE W. CONTINUED FOR LNDG WHILE THE COMMUTER APPARENTLY DID A R 360 DEG TURN AND THEN LANDED AFTER I HAD CALLED 'CLR OF RWY 18' AND WAS APCHING THE RAMP. LINE GUY CAME OVER AFTER SHUTDOWN AND INDICATED THAT THE COMMUTER HAD BEEN TRYING TO MAKE RADIO CONTACT ON UNICOM BUT HAD NOT HEARD ANY ANSWER. CHKED THE RADIO AND VERIFIED THAT XMIT WAS SET TO #2 COM, THE AUDIO PANEL TO 'AUTO,' AND THE COM ITSELF TO 123.0, THE BRL UNICOM FREQ. LINE GUY SAID HE HAD HEARD ONLY MY FIRST XMISSION BUT NOT ANY SUBSEQUENT ONES. (WHEN, ON DEP, CHKED #2 RADIO, IT WAS OK, BUT #1 WAS RPTED 'MUCH BETTER.' USED #2 FOR ENTIRE TRIP BACK TO MSN AS A TEST, HOWEVER, INCLUDING FLT FOLLOWING FROM MLI, RFD, AND MSN, WITH NO APPARENT OR RPTED DIFFICULTY.) WENT OVER AND TALKED WITH COMMUTER CAPT AND FO, APOLOGIZED FOR THEIR NEED TO GO AROUND (SINCE I WOULD HAVE DEFERRED TO A SCHEDULED CARRIER AS A COURTESY), AND TRIED TO FIGURE OUT WITH THEM WHAT HAD HAPPENED. THEY INDICATED THAT THEY HAD HEARD ALL MY RADIO CALLS (UNLIKE THE LINE GUY) SO THEY KNEW MY LOCATION THROUGHOUT, BUT HAD BEEN UNABLE TO ESTABLISH CONTACT WITH ME. CAPT COMMENTED I HAD 'DONE RIGHT' BECAUSE I 'KEPT BROADCASTING MY POS.' FO SAID THEY ALSO HAD ME ON TCASII 'INTERMITTENTLY.' BOTH SEEMED TO TAKE THE GAR IN STRIDE, THOUGH FO NOTED I SHOULD BE SURE TO CHK THE RADIOS ON DEP.
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.