EASA SIB 2015-18: Potential Adverse Effect of Anti-Icing Fluids during Take-off

What to do

Operators should assess whether their aircraft and operating conditions are affected by this issue and review their manuals and pilot training accordingly. They are encouraged to monitor flight data for signs of increased control forces or degraded take-off performance when anti-icing fluids are used and report findings to type certificate holders and authorities. Operators must continue following Aircraft Flight Manual and winter operations instructions and consult manufacturers if in doubt.

Summary

EASA Safety Information Bulletin 2015-18 is an informational bulletin addressing the potential adverse effects of thickened anti-icing fluids (type II and IV) on airplane control during take-off. It primarily concerns aircraft with unpowered elevator controls and low to medium take-off rotation speeds, highlighting increased control forces and delayed rotation caused by fluid contamination on the horizontal stabiliser and elevator surfaces. The bulletin shares research findings from wind tunnel tests and provides guidance to operators and pilots on assessing and mitigating these effects.

What changed

EASA SIB 2015-18 introduces findings from a research project that confirmed increased stick forces and reduced stabiliser lift during take-off when thickened anti-icing fluids are applied. It highlights that type II and IV fluids significantly impact elevator control forces, while type I fluids do not. The bulletin does not mandate new regulations but provides recommendations for operators to evaluate and manage the risk.

Why it matters

This bulletin matters because it informs operators and pilots about a potential safety hazard that can affect take-off performance and control, especially for aircraft with unpowered flight controls. Understanding these effects helps prevent incidents related to delayed rotation and increased pilot workload, thereby enhancing operational safety during winter conditions. It also guides compliance teams on reviewing operational procedures and training to address this issue.