Service difficulty report · Battery Box · Beech C35BEECH

Difficulty date
March 17, 2015
Submitted
March 17, 2015
Operation
General aviation
Aircraft
N2071W
Make and model
Beech C35BEECH
Aircraft serial
CD987
Aircraft time
5,422 hours
Engine
Cont IO470*
Part
Battery Box
Part serial
1282
Condition
Mismanufactured
Part time
46 hours
Stage of operation
NR
How discovered
9
Nature of condition
W
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

THE FACTORY ACFT BATTERY BOX WAS REPLACED DUE TO ACID DAMAGE CAUSING LEAKS WITH A STAINLESS STEEL BATTERY BOX. IT WAS OBSERVED THAT THE STAINLESS BATTERY BOX WAS LEAKING ACID ON THE FIREWALL AND DAMAGED WIRE IN A WIRE BUNDLE RUNNING UNDER THE BATTERY BOX. THE NEW BATTERY BOX IS NOT WELDED SOLID AROUND THE SEAMS AT THE BOTTOM, JUST AT THE CORNERS, AND THE BOX IS SEALED WITH SILICON SEALANT THAT IS NOT HOLDING UP TO THE ACID FROM THE BATTERY OR THE BAKING SODA AND WATER USED FOR CLEANING. A CALL TO THE STC HOLDER WAS MADE. THE SUGGESTED A DETAILED CLEANING OF THE BATTERY BOX AND AN APPLICATION OF RANDOLPH NR 345 ACID PROOF PAINT BE APPLIED TO THE INSIDE OF THE BATTERY BOX. ITEM 13 IN THE BATTERY INSTALLATION INSTRUCTIONS; GENERAL INSPECTION AND CLEANING ONLY. THE STAINLESS STEEL BATTERY BOX ASSEMBLY DOES NOT REQUIRE MAINTENANCE. RECOMMENDED: COATING BATTERY TERMINALS WITH BATTERY PROTECTOR OR EQUIVALENT PROTECTIVE COATING.