Periodic Maintenance; Equipment Calibration; Vor Checks; Cleaning - Garmin GTN 625 Installation Manual

7 PERIODIC MAINTENANCE

7.1 Equipment Calibration

No scheduled servicing tasks are required on the GTN 625, GTN 635, or GTN 650.

7.2 VOR Checks

Refer to CFR 14 paragraph 91.171. Every 30 days verify the limits of the permissible indicated bearing
error.

7.3 Cleaning

The front bezel, keypad, and display can be cleaned with a microfiber cloth or 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.

7.4 Battery Replacement

WARNING
This product contains a lithium battery that must be recycled or disposed of properly.
Battery replacement and removal must be performed by professional services.
The GTN includes an internal battery that will last 5 to 8 years. The battery is used for internal time clock
and GPS system information. Regular planned replacement is not necessary. The GTN will display a "Low
Battery" and "Unit Needs Service" message when replacement is required. Once the low battery message
is displayed, the battery should be replaced within 1 to 2 months.
If the battery is not replaced and becomes totally discharged, the GTN will remain fully operational, but
the GPS signal acquisition time will be increased. There is no loss of function or accuracy of the GTN with
a dead battery.
190-01004-02
Rev. F
GTN 625/635/650 TSO Installation Manual
Page 7-1