190-01007-A1
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5
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.
