Garmin GRA 55 Maintenance Manual - Page 21

Instructions For Continued Airworthiness

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4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS 4.1 Servicing Information None. In the event of system failure, troubleshoot the GRA 55/5500 in accordance with Section 5 of this document. 4.2 Periodic Maintenance The GRA is designed to detect internal failures. A thorough self-test is executed automatically upon application of power to the unit. Furthermore, automated built-in tests (BIT) are continuously executed every minute within the altitude range of 250ft to 2550ft. Operation of the GRA 55/5500 is not permitted unless the inspections described in this section have been completed within the time intervals prescribed in Table 4-1. 4.3 Special Tools A milliohm meter with an accuracy of +/- 0.1 milliohms ohms (or better) is required to measure the electrical bonding between the GRA 55/5500 LRU and aircraft ground. 190-01277-A3 Rev. 1 System Maintenance Manual GRA 55/5500 Bell 206 STC Page 4-1

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190-01277-A3
System Maintenance Manual GRA 55/5500 Bell 206 STC
Rev. 1
Page 4-1
4
INSTRUCTIONS FOR CONTINUED AIRWORTHINESS
4.1
Servicing Information
None. In the event of system failure, troubleshoot the GRA 55/5500 in accordance with Section 5 of this
document.
4.2
Periodic Maintenance
The GRA is designed to detect internal failures. A thorough self-test is executed automatically upon
application of power to the unit. Furthermore, automated built-in tests (BIT) are continuously executed
every minute within the altitude range of 250ft to 2550ft.
Operation of the GRA 55/5500 is not permitted unless the inspections described in this section have been
completed within the time intervals prescribed in Table 4-1.
4.3
Special Tools
A milliohm meter with an accuracy of +/- 0.1 milliohms ohms (or better) is required to measure the
electrical bonding between the GRA 55/5500 LRU and aircraft ground.