Garmin MX20 Installation Manual - 6.1 Equipment Calibration

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Continued Airworthiness

MX20 Installation Manual

6 Continued Airworthiness Instructions

The MX20 is designed to not require any regular maintenance except as included in this section:

6.1 Equipment Calibration

The MX20 design requires no adjustments or calibration to be made.

6.2 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.

The display backlighting is rated by the manufacturer as having a usable life of over 10,000 hours.

This life may be more or less than the rated time depending on the operating conditions of the MX20.

Over time, the backlighting may dim and the display may not perform as well in direct sunlight

conditions. The user must determine by observation when the display brightness is not suitable for its

intended use. Contact Garmin AT when the backlighting requires service.

6.4 Lithium Battery Replacement

The internal keep-alive battery will require replacement after 5 years of service. The Li battery is only

included in MX units with internal GPS (430-0270-0( )). The effect of battery failure is a loss of the

real time clock in the GPS receiver. The unit will still work with loss of battery power; however, GPS

acquisition may take considerably longer time (20 minutes). There is no hazard associated with such a

failure.

To replace the battery, the MX20 must be removed from the aircraft and serviced by an appropriately

rated Garmin AT service center. If the aircraft is to fly without the unit installed, placard the aircraft

accordingly.

Note: The battery is to be replaced ONLY with Garmin AT part number 148-0052-00, or a

Garmin AT approved equivalent.

CAUTION

The battery may explode if mistreated. Risk of fire, explosion, and burns. Do not

recharge, disassemble, heat above 100

°C, or incinerate.

In this VFR non-essential system, it is recommended that the altitude encoder be calibrated every 24

months. Refer to the manufacturer’s installation and calibration manual.

Incorporate operational test and troubleshooting guides into Aircraft Maintenance manuals. Update

the wiring diagram manual and equipment list as necessary. Add each component to the reliability

program as necessary.