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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 6-26
6.12 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 6-14.
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” 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) or
equivalent 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 6-14. 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
milliohms.
Figure 6-14. Instrument Panel Bonding
Table 6-7. Instrument Panel Bonding Hardware
Hardware P/N
Bolt AN5-XA
Washer 1 (5/16" lock washer) NASM35338-45
Washer 2 (5/16" flat washer) NAS1149F0532P
Washer 3 (.063" thick flat washer) NASM970-516 or AN970-5
Locknut (5/16") MS21042, MS20364, MS21045, or MS20365
BOLT
WASHER 1
WASHER 2
WASHER 3
WASHER 3
LOCK NUT
LUG
INSTRUMENT PANEL