Garmin GTN 6 series Maintenance Manual - page 41

190-01007-A1

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC

Rev. 6

Page 4-1

4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS

4.1 Airworthiness Limitations

There are no additional Airworthiness Limitations as defined in 14 CFR §23, Appendix G, G23.4 that 

result from this modification. 

4.2 Servicing Information

The GTN and GMA do not require servicing. In the event of system failure, troubleshoot the 

GTN 6XX/7XX and GMA 35 in accordance with Section 5.

4.2.1

Periodic Maintenance

The GTN and GMA 35 are designed to detect internal failures. A thorough self-test is executed 

automatically upon application of power to the units, and built-in tests (BIT) are continuously executed. 

Detected errors are indicated as failure annunciations, system messages, or a combination of the two.

Operation of the GTN 6XX/7XX and GMA 35 is not permitted unless the inspections described in this 

section have been completed within time intervals prescribed in Table 4-1. All antennas connected to the 

GTN should be maintained in accordance with appropriate inspection data for the antenna installation.

4.2.2

Special Tools

A milliohm meter with an accuracy of +/- 0.1 milliohms ohms (or better) is required to measure the 

electrical bonding between the GTN/GMA system components and aircraft ground. 

The Airworthiness Limitations section is FAA approved and specifies maintenance required 

under §43.16 and §91.403 of the Federal Aviation Regulations unless an alternative program has 

been FAA approved.