Instrument Panel Bonding Strap; Figure 6-13 Instrument Panel Bonding; Table 6-7 Instrument Panel Bonding Hardware - Garmin GTN Xi Series Maintenance Manual

6.10

Instrument Panel Bonding Strap

The following steps are provided as guidance for replacing a damaged instrument panel bonding strap.
Reference the bonding strap hardware stack up in Figure 6-13.
Removal
The bonding strap is attached in two locations. The terminal lug is secured with a lock nut. To remove the
strap, access both sides of the instrument panel and the nearby structure and unbolt the hardware.
Replacement
NOTE
The instrument panel bonding strap should be as short as practical and must not exceed
6 inches in length.
1. Construct a bonding strap by attaching 5/16" inside diameter insulated terminal lugs
(MS20659-131) to both ends of the braid (3/4" tinned copper flat braid (QQB575F36T781) may
be used).
2. If needed, clean the attachment locations with a bonding brush.
3. Secure each end of the bonding strap to the previously installed locations. Ensure that the strap
does not loop back on itself and that the hardware is as shown in Figure 6-13. The washers must
seat fully against the aircraft metallic structure, without overhang or interference from other
hardware.
4. Using a milliohm meter, verify that the resistance between the connected structure is less than
2.5 mΩ.
WASHER 1
WASHER 2
WASHER 3
WASHER 3
LOCK NUT
Hardware
Bolt
Washer 1 (5/16" lock washer)
Washer 2 (5/16" flat washer)
Washer 3 (0.063" thick flat washer)
Locknut (5/16")
190-01007-C1
Rev. 1
BOLT

Figure 6-13 Instrument Panel Bonding

Table 6-7 Instrument Panel Bonding Hardware

LUG
INSTRUMENT PANEL
Part Number
AN5-XA
NASM35338-45
NAS1149F0532P
NASM970-5 or AN970-5
MS21042, MS20364, MS21045, or MS20365
GTN Xi Part 23 AML STC Maintenance Manual
Page 6-22