Interim Report - Introduction - EASA

INTERIM REPORT – OPTIONS FOR CHANGE – ATTACHMENT A
EASA.2009.OP.21
concerned “ice in gaps” and since 2005 there have been none. This may, however,
be due to a change in diagnosis.
− Boeing reported that, prior to 2005, they had more occurrences per year of gel residue
build-up than they have had in total since 2005. They attribute the new Potassium and
Sodium-based Runway De-icing Fluids as contributing to the residues.
− Bombardier stated that the “classic” residue incidents have reduced with time, and
only a handful have occurred in the past 5 years.
All the manufacturers attribute the fall in incidents and occurrences to:
− raised awareness,
− recommendations to use Type I and the two-step procedure (NB: there’s no evidence
that operators are actually complying with these recommendations), and
− implementation of inspection programmes and regular cleaning.
airsight GmbH - 3 -