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Pilot of small transport in 30 mi zone of bos with dual mode C transponders, neither of which could be read by bos TRACON. Next flight the transponders worked normally.
| Attributes | |
| ACN | 130099 |
| Time | |
| Date | 198912 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bos |
| State Reference | MA |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos tower : phl |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : instrument pilot : cfi pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 10000 flight time type : 8000 |
| ASRS Report | 130099 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other controllera other other : unspecified cockpit |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
VMC departure from lwn outside bos TCA but within 30 NM bos. On climbout 1500' contacted bos approach on 124.1 advised position, altitude and squawking 1200 requesting advisories to oxc. Aircraft equipped with dual mode C transponders which were operating norm on previous flight. Temperature was 4 degree F. Bos advised radar contact no mode C. I switched to #2 tx and bus again advised no mode C. I switched back to #1, still no mode C. I then was approximately 25 NM northwest of bos and turned away from bos until exiting 30 NM radius then proceeded on course. On next flight temperature 25 degree F both mode C operating norm.
Original NASA ASRS Text
Title: PLT OF SMT IN 30 MI ZONE OF BOS WITH DUAL MODE C TRANSPONDERS, NEITHER OF WHICH COULD BE READ BY BOS TRACON. NEXT FLT THE TRANSPONDERS WORKED NORMALLY.
Narrative: VMC DEP FROM LWN OUTSIDE BOS TCA BUT WITHIN 30 NM BOS. ON CLIMBOUT 1500' CONTACTED BOS APCH ON 124.1 ADVISED POSITION, ALT AND SQUAWKING 1200 REQUESTING ADVISORIES TO OXC. ACFT EQUIPPED WITH DUAL MODE C TRANSPONDERS WHICH WERE OPERATING NORM ON PREVIOUS FLT. TEMPERATURE WAS 4 DEG F. BOS ADVISED RADAR CONTACT NO MODE C. I SWITCHED TO #2 TX AND BUS AGAIN ADVISED NO MODE C. I SWITCHED BACK TO #1, STILL NO MODE C. I THEN WAS APPROX 25 NM NW OF BOS AND TURNED AWAY FROM BOS UNTIL EXITING 30 NM RADIUS THEN PROCEEDED ON COURSE. ON NEXT FLT TEMPERATURE 25 DEG F BOTH MODE C OPERATING NORM.
Data retrieved from NASA's ASRS site as of August 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.