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Item

Description/Procedure

Battery Replacement The GTN has an internal keep-alive battery that will last about

10 years. The battery is used for GPS system information.

Regular planned replacement is not necessary. The GTN will

display a low battery' message when replacement is required.

Once the low battery message is displayed, the battery should

be replaced within 1 to 2 months. If the battery is not replaced

and becomes totally discharged, the GTN unit will remain fully

operational, but the GPS signal acquisition time may be

increased. There is no loss of function or accuracy of the GTN

unit with a dead battery. The battery must be replaced by the

Garmin factory repair station or factory authorized repair

station.

Test – Bonding

Perform an electrical bonding check.

Check, GTN/GMA

1. Remove the GTN and GMA 35 (if installed) from the

2. Remove the backplate assembly from the rack(s), such that

NOTE

For GTN 7XX only, if the GMA 35 is installed, it must be

removed from its rack and the GMA 35 backplate assembly

must be removed prior to performing Step 3. When a GMA 35

bonding check is planned, perform the GMA 35 bonding check

prior to reinstalling the GTN backplate assembly to the rack.

3. Measure the resistance between each mounting rack and

In the event of bonding test failure, remove the rack and verify

that the countersunk areas around the holes, in the rack that

are used to attach the rack, are free of corrosion or any other

debris. Clean the countersunk areas using an approved

solvent per Eurocopter Standard Practices Manual (MTC 20-

02-07-401). Reattach the rack to the rails in the panel. Re-

verify the resistance between the mounting rack and nearby

exposed portion of aircraft metallic structure and ensure that

the resistance is less than or equal to 2.5 milliohms.

4. Reinstall all backplate assemblies and reinstall the GTN in

Instructions for Continued Airworthiness GTN 6XX/7XX - Eurocopter EC130 Series

Page 5 of 21

mounting rack(s)

the harnesses are disconnected.

nearby exposed portion of metallic structure and verify that

the resistance is less than or equal to 10 milliohms.

the mounting rack.

Interval

On Condition

Bond Check to be

performed every

10 years or 1800

flight hours,

whichever comes

first. The check

is to be

performed in

accordance with

Chapter 24,

Section 6.2 of the

Aircraft

Maintenance

Manual during

the EC 130 600

flight hour/24

month

inspection.

190-01007-K9 Rev. 1