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CHAPTER 6:  TROUBLESHOOTING

A. RADIOSONDE REJECTION PROCEDURES

Occasionally, it will be necessary to reject a radiosonde.  When preparing the sonde, there may be obvious damage to a sensor.  Pay particular attention to the temperature sensor.  Usually, a sonde will be rejected during baseline because the data (usually pressure) will be out of tolerance.

If the baseline data is out of tolerance, click on the “Reject” button.  You will be taken back to the Equipment Display screen.  Follow the appropriate steps to prepare a new sonde.  Use the battery from the first sonde if it’s still good.

Save the sensor covers from the second sonde and place them onto the sensors on the first sonde.  Give the rejected sonde to the OPL along with a note with the flight date and time, reason for rejection, and your initials.  The OPL will test the sonde to confirm the problem.

B. CHECK MESSAGES

The “Check Messages” window will provide messages on questionable data during the flight.  Some of the messages might be about abrupt changes in wind direction and/or speed between certain data points or a major difference in heights compared to the previous flight.  Most of these messages are simply warnings and not indicative of a problem.  However, check the data to be sure.

A superadiabatic lapse rate is another message to watch closely.  High temperature lapse rates are often common in the first few data points, especially during an afternoon release.  If the lapse rate seems unrealistic during the initial data points, try changing the release time to reduce the lapse rate to a more acceptable level.

If a superadiabatic lapse rate occurs late in the flight, it could indicate a problem with the temperature sensor.  If may require the flight to be terminated early.  A superadiabatic lapse rate is indicated on a temperature plot by a sharp line from right to left.

C. LIMITED SEARCH

A warning message may appear during the flight stating that “Application has detected conditions requiring a limited search.”  This means that the signal strength has probably dropped below 14 at some point.  Immediately check the signal strength.  If the signal is still low, check the SPS and ensure that it is tracking properly.  Check that the azimuth and elevation angles in the TRS Display are close to the azimuth and

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