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2.6 Cooling Requirements
Dedicated cooling is not required for the GRA 5500 to meet indicated EQF categories. Thermal analysis
must be performed to verify that high temperature limits implied by the indicated EQF categories for the
GRA 5500 are not exceeded during normal operation of the aircraft. Guidance can be found in the Garmin
Integrated Avionics System Thermal Management Plan document (GPN 190-00313-50) and the Garmin
Integrated Avionics System Thermal Validation Procedure (GPN 190-00313-51).
Contact Garmin for additional cooling guidance.
2.7 Mounting Requirements
The GRA 5500 mounting surface should be capable of providing a sufficient electrical bond to the aircraft
to minimize Electromagnetic Interference (EMI) and provide protection from High-Intensity Radiation
Fields (HIRF). Bonding resistance measured between the GRA 5500 mounting rack and the airframe
should measure less than 2.5 milliohms. The GRA 5500 must be mounted in the vertical position using the
GRA 5500 mounting rack. Refer to
GRA 5500 Installation Manual
Page 2-14
Appendix B
for outline and installation drawings.
GRA 5500 MOUNTING RACK
011-02567-00
Figure 2-8 GRA 5500 Mounting Rack
190-01277-00
Rev. A
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