Service difficulty report · Fuel Cell · Bell 407

Difficulty date
June 14, 2016
Submitted
August 8, 2016
Operation
General aviation
Aircraft
N407CM
Make and model
Bell 407
Aircraft serial
53722
Engine
Allsn 250C47B
Part
Fuel Cell
Part number
407362633101
Part serial
00777
Condition
Leaking
Location
Fuel System
Part time
415 hours
Stage of operation
IN
How discovered
V
Nature of condition
K
Precautionary procedure
K

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

What was found

FUEL CELL, PN 407-362-633-101, SN 00777 MANUFACTURED IN 06/23/2006 WAS FOUND TO BE IN AN UNAIRWORTHY CONDITION DURING A ROUTINE 24 MONTH INSPECTION. IT IS THE METHOD OF FAILURE AND THE TT OF THE PART THAT HAS SPURRED THIS REPORT. THE FUEL CELL MATERIAL WAS FOUND TO BE COMPLETELY SATURATED/PERMEATED WITH FUEL AND WEEPING EXTERNALLY FROM EVERY SEAM. THE LEAK WAS OF SUCH QUANTITY THAT EVIDENCE OF THE LEAK WAS DRIPPING ON THE FLOOR AND HAD COMPLETELY PERMEATED THE FUEL CELL TAPE AND SUPPORTS INSIDE THE FUEL CELL. THIS LED TO MOLD CONTAMINATION AND REQUIRED SUBSTANTIAL TIME TO CLEAN AND SANITIZE THE FUEL CELL AREA.

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