ETP critical fuel and ICE

SimBrief Dispatch
1

Hello,
I have two questions regarding ETP critical fuel and ICE as displayed in the ETOPS/ETP Critical Point information section of the OFP.

  1. I understand the ICE column is to allow extra fuel in case anti-icing is required during the diversion from the critical point to the ETOPS alternate. Could you explain how this amount of fuel is calculated? Are forecast weather conditions along the ETOPS alternate diversion taken into account wrt forecast icing conditions at the diversion altitude?
  2. Does the ETOPS critical fuel quantity column include the ICE fuel required? For example, if CFUEL is 20.2 and ICE is 0.9, does the 20.2 already include the 0.9?

I searched the Simbrief forums, but couldn’t find any info on this subject.

Many thanks.
Kind regards
Michael.

2

At least in real systems it does, to show how much was added for ETOPS Icing, so in your case of the 20.2, 0.9 was added for Icing in the ETOPS portion. After the ETOPS 2007 rewrite, ETOPS icing fuel is no longer required unless icing is forecast in the ETOPS portion of the flight, and most modern flight planning systems can determine that; some use relative humidity, some can incorporate the Icing probability in the ICAO WAFS Hazard Grid forecast.