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Periodic Maintenance
Apollo SL30 Installation Manual
53
APPENDIX B - PERIODIC MAINTENANCE
The SL30 unit is designed to not require any regular general maintenance except as included
in this section.
VOR CHECKS
Even though the SL30 is designed to utilize the most state-of-the-art DSP technology and
maintain a very high accuracy and repeatability record, it still must undergo the VOR
accuracy checks required for IFR flight. Refer to CFR 14 paragraph 91.171. Every 30 days
verify the limits of the permissible indicated bearing error.
The last VOR check information may be entered into the SL30 via the system mode VOR
CHECK. See the operator’s manual for details.
EQUIPMENT CALIBRATION
The SL30 design requires very few adjustments or calibration to be made. In fact, there are no
internal manual adjustments.
REFERENCE OSCILLATOR (COMM ONLY)
The reference oscillator frequency should be checked approximately every 3 to 5 years to
ensure the units transmit frequency is within allowable tolerance.
The oscillator frequency can be checked by connecting the transmitter output through an
appropriate load to a calibrated frequency counter. The transmit frequency should be within
15ppm of the selected channel frequency. Contact the Garmin AT factory for instructions on
adjusting the frequency if required.
CLEANING THE FRONT PANEL
The front bezel, keypad, and display can be cleaned with a soft cotton cloth dampened with
clean water. DO NOT use any chemical cleaning agents. Care should be taken to avoid
scratching the surface of the display.