Installation manual

Periodic Maintenance
Apollo MX20 Installation Manual
57
5 CONTINUED AIRWORTHINESS INSTRUCTIONS
The MX20 is designed to not require any regular maintenance except as included in this section:
5.1 EQUIPMENT CALIBRATION
The MX20 design requires no adjustments or calibration to be made.
5.2 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.
5.3 DISPLAY BACKLIGHT
The display backlight lamps are rated by the manufacturer as having a usable life of 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 backlight lamps will dim and the display will 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 UPS Aviation Technologies when the backlight lamps require service.
5.4 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 430-0270-0xx. 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 UPS 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 UPS AT part number 148-0052-00, or a UPS 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.
5.5 ALTITUDE ENCODER
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.
5.6 MANUALS
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.