Greetings
Concerning the white-coloured bug located on the speed tape, that is displayed when you select VREF in the CDU. The bug reads VREF + 20.
I have been told that this bug is used as reference for two things - 1: as a speed marker for one engine only during TOGA; and 2: as a bug to set the MCP speed to when making your initial descent after the Initial Approach FIX (IAF).
Can someone clarify its this please ??
Thank You, WilloW