Tue, Dec 12, 2006
Applicability: Model
LC41-550FG and LC42-550FG aeroplanes, all serial numbers, equipped
with Kelly Aerospace Thermal Systems Thermawing Deice System (also
known as E-Vade) under United States Federal Aviation
Administration (FAA) Supplemental Type Certificate (STC)
SA02260CH.
Requirement:
1. Deactivate the Thermawing Deice System installed under STC
SA02260CH using the procedures detailed in Kelly Aerospace Thermal
Systems Service Letter Bulletin No. SL-06-001, dated 15 November
2006.
2. Fabricate a placard that incorporates the following words using
at least 6 mm (¼-inch) black letters on a white background
and install this placard in clear view of the pilot. “DEICE
SYSTEM INOPERABLE”
Note: FAA AD 2006-25-08 Amdt 39-26400
refers.
Compliance:
For Requirements 1 and 2 - Before further flight after 21
December 2006.
This Airworthiness Directive becomes effective on 14 December
2006.
Background:
The FAA has received reports
of problems with the installation of the Kelly Aerospace Thermal
Systems Thermawing Deice System on Columbia Aircraft Manufacturing
Models LC41-550FG and LC42- 550FG aeroplanes following
incorporation of STC SA02260CH.
A short circuit condition at the deice heater connector to the
copper mesh material imbedded in the composite aeroplane structure
(for lightning protection) caused burning of the wings and
horizontal stabilizer, which created holes in the structure. The
short circuit was caused by insufficient removal of copper mesh
when the deice heater connectors were installed.
This condition, if not corrected, could cause damage to the
wings and horizontal stabilizer resulting in reduced structural
integrity of the aeroplane.
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