Installation Instructions
190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 1-13
1.6 Technical Specifications
For GTN 6XX technical specifications, see GTN 625/635/650 TSO Installation Manual, P/N 190-01004-02.
For GTN 7XX technical specifications, see GTN 725/750 TSO Installation Manual, P/N 190-01007-02.
1.6.1 Environmental Qualification Forms
The latest revision of the Environmental Qualification Forms for the GTN 6XX and 7XX as well as the
GMA 35 are available directly from Garmin under the part numbers listed in Table 1-4.
Table 1-4. GTN 6XX/7XX and GMA 35 Environmental Qualification Forms
Document Garmin Part Number
GTN 625/635/650 Environmental Qualification Form 005-00532-13
GTN 725/750 Environmental Qualification Form 005-00533-13
GMA 35 Environmental Qualification Form 005-00567-01
To obtain a copy of these forms, see the Dealer Resource Center on Garmin’s website.
1.6.2 Power Requirements
The GTN and GMA 35 are capable of operating at either 14 or 28 VDC. See the individual
GTN 6XX/7XX or GMA 35 Environmental Qualification Forms for details on surge ratings and
minimum/maximum operating voltages. See Table 1-5 for current draw specifications.
Table 1-5. GTN and GMA 35 Current Specifications
LRU
14 Volt Current Draw 28 Volt Current Draw
Typical Maximum Typical Maximum
GTN 625, 635, 650
(Main Connector)
1.6 A [1] 2.8 A [2] 0.8 A [1] 1.5 A [2]
GTN 635, 650
(COM Connector)
0.45 A 4.02 A (10W COM) 0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
GTN 650
(NAV Connector)
0.60 A 1.16 A [2] 0.30 A 0.58 A [2]
GTN 725, 750
(Main Connector)
2.4 A [1] 3.4 A [2] 1.2 A [1] 1.8 A [2]
GTN 750
(COM Connector)
0.45 A 4.02 A (10W COM) 0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
GTN 750
(NAV Connector)
0.60 A 1.16 A [2] 0.30 A 0.58 A [2]
GMA 35 0.80 A 1.50 A 0.40 A 1.0 A
[1] The specified current draw is with the display backlight set to 100% and the fan operating
at low speed. If the superflags are connected, their current draw must be added in
addition to the specified current. The superflags will supply up to 320 mA each regardless
of the GTN’s input voltage.