Service Information Letter All SILs
| SIL Number | Title | Date (YYYY-MM-DD) | Effectivity |
|---|---|---|---|
| 30-0001 | Ice-Phobic Coating Streaking | 2013-01-10 | Aircraft with SB 500-99-004 Incorporated |
Click on the button to download this Service Information Letter document.
Applicability
SIL Summary
This letter provides information regarding streaking of the ice-phobic coating around the static ports.
SIL Background
On aircraft certified for Flight into Known Icing (FIKI) the ice-phobic coating applied around the static ports is an
integral component of the complete ice protection system. The coating (PhaseBreak ESL) is a two-part Epoxy that
reduces ice particle adhesion (ice-phobicity). It is a unique formulation of epoxy, ethoxy silicates and freezing point
depressants. The epoxy formulation creates a surface that is difficult for ice to adhere to, and the freezing point
depressants slowly leach to the surface and mix with precipitation to lower the freezing point of the precipitation
that is encountered.
After application of the coating, some customers have noted the appearance of streaks on the fuselage emanating
from the coating area. The amount of streaking tends to diminish over time.
Eclipse Action
The recommendations contained in this SIL effectively address the described condition; no additional service action is required.
Suggested Operator Action
Immediately after application of the coating, the rate at which the freezing point depressant leaches to the surface is
relatively high, particularly in a humid environment. It is not uncommon for the freezing point depressant to leach out
in sufficient quantity after a new application to leave streaks, particularly in rain or high humidity. This tendency will
dissipate quickly as the coating continues to harden.
The freezing point depressant should not harm the polyurethane topcoat applied to the aircraft fuselage and is
readily soluble in water. It can be removed by wiping the affected area with a wet cloth.
The quantity of freezing point depressant contained in the ice-phobic decreases as it performs its intended function.
Thus, to ensure it continues to provide the necessary protection, the ice-phobic coating must be tested periodically in
accordance with the maintenance requirements defined in Chapter 5 of the Aircraft Maintenance Manual (AMM),
currently every 50 flight hours or 3 months (whichever occurs first). If re-application of the coating becomes required,
the procedures can be found in AMM 20-09-00.
EAI encourages operators to report ice-phobic coating testing results to support product enhancements such as
performance improvements and extension of testing intervals.
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.