Service Information Letter All SILs
| SIL Number | Title | Date (YYYY-MM-DD) | Effectivity |
|---|---|---|---|
| 56-0001 | Windshield Resistive Strip Erosion | 2013-01-02 | 0001-0300 |
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Applicability
Aircraft incorporating SB 500-56-002
SIL Summary
This letter provides clarification of serviceability of the windshield anti-static resistive strip installation.
SIL Background
Resistive strips were developed and certified as an alternative to the windshield anti-static coating that is required for P-static dissipation on aircraft approved for Flight Into Known Icing operation. Some customers have noticed the appearance of delamination of one or more resistive strips on their aircraft. Service Engineering has several operator requests to clarify when a delaminating strip is unserviceable.
Eclipse Action
The recommendations contained in this SIL effectively address the described condition; no additional service action is required.
Suggested Operator Action
The resistive strip used on the EA500 aircraft is comprised of an outer protective layer covering a fiberglass
laminate. A resistance element is bonded to the laminate and an adhesive strip, which is also used to bond the
assembly to the windshield. When properly installed and bonded to the aircraft, the strip has a maximum resistance
to the airframe of 1000 Ohms.
Loss of the protective outer layer is due to erosion from exposure to the environment. The protective outer layer is
not critical to the proper operation of the resistive strip, therefore partial or complete loss of the protective outer
layer does not render the resistive strip unserviceable.
Serviceability of the resistive strip is defined in AMM 56-10-12 as a bonding check of the strip to the airframe.
Provided the strip meets the defined performance standard, it may remain in service regardless of the condition of
the protective outer layer.
Export Control
These commodities, technology or software, were exported from the United States in accordance with the Export Administration Regulations. These commodities, technology or software are intended for use only in the End User’s country. An export license from the U.S. Department of Commerce may be required before these products can be re-exported, transferred, transshipped on a non-continuous voyage, or otherwise disposed of in any other country, either in their original form or after being incorporated into an end item. Diversion of this end-item or its use contrary to any applicable U.S. government license or to U.S. law is prohibited.