We have a caution and a warning regarding ice buildup (IAE Engines) . I haven't seen ice buildup on the heated surfaces, but have felt it on the unheated surfaces. My technique is if I see ice buildup on the ice probe (which of course is unheated) I assume some ice has built up elsewhere on the aircraft. (Could be a wrong assumption, but it works in my mind...)
If ice accumulates on heated surfaces, either the capacity of the anti-ice system has been exceeded or there is a possible anti-ice system fault. Minimum speeds should be:
• Clean configuration: VLS + 15 knots
• CONF 1, 2, 3, or Full: VLS + 10 knots
If ice buildup is suspected on unheated surfaces and landing with flaps Full, approach speed must not be lower than 5 knots above VLS as displayed on the PFD. Multiply the landing distance by 1.1.
If ice buildup is suspected on unheated surfaces and landing with flaps 3 or less, approach speed must not be lower than 10 knots above VLS as displayed on the PFD. Multiply the landing distance by 1.15.