What conditions favor the formation of induction icing?

Induction icing occurs when supercooled water droplets come into contact with the aircraft's engine components, particularly the air intake, and freeze upon impact. The conditions that favor this phenomenon typically involve the presence of high humidity and temperatures below freezing.

The choice indicating clear skies during taxiing and reduced pressures suggests conditions where moisture is present in a high-humidity environment, which can lead to the formation of ice when these droplets are ingested into the engine against a backdrop of lower atmospheric pressure that might contribute to cooling. Clear skies can often indicate warmer air aloft where supercooled droplets may be present, but as the aircraft operates and reduces pressure in its induction system, icing can result.

In contrast, the options involving freezing rain, cumulus cloud formations, or warm temperatures do not fit the profile for induction icing as effectively. Freezing rain generally indicates a different type of icing that forms on the airframe, while cumulus clouds can contain turbulence but may not provide the stable conditions needed for induction icing. Warm temperatures with high humidity could indicate conditions favorable for other forms of icing, but are less likely to promote the supercooled conditions necessary for induction icing. Thus, clear skies and specific pressure conditions are more favorable for induction icing to form due