What Aircraft Are Affected:
DASSAULT FALCON 7X SERVICE BULLETIN 337 – R1 is applicable to Falcon 7x aircraft with the serial numbers 2 and subsequent which have not previously implemented DASSAULT AVIATION modification FALCON 7x M1446.

Reason:
SB-7X-337R1 cites that evidence of overheating on the negative feeder terminal of battery 1 has been reported.  This overheating may lead to disconnection of battery 1.  The purpose of the SB is to improve the reliability of the connection by increasing the contact surface.

The Process:
The operation consists of:

• Replacing the negative feeder of battery 1 with a  new feeder that includes a terminal lug with a larger contact surface on the A/C bracket side
• Clean up of the A/C bracket by milling
• Compliance to be accomplished during next 1A Inspection

Beyond The Service Bulletin:

West Star Aviation (ALN) recently had a 7X customer in for work, and this Service Bulletin was addressed.  On A/C input, the number 2 battery was intermittent to come on line. 

After reviewing fault data history, no faults were noted. West Star Aviation Falcon Specialists performed systematic checkout of aircraft above and beyond any of the available SB information to find resistance of the battery cable and ground lug to be out of tolerance. Service Bulletin 337-R covers only the number 1 battery.

West Star Aviation recommends that 7X operators that may be addressing SB-337R have their MRO be sure to inspect the #2 battery for the same issues to ensure a more reliable connection to the batteries.