What is one potential effect of arcing on an electrically heated windshield?

Localized overheating and damage to the windshield can occur due to arcing on an electrically heated windshield. Arcing typically refers to the discharge of electricity across a gap, which can generate intense heat in concentrated areas. This overheating can lead to thermal stress, potentially causing cracks or other forms of damage to the glass.

In the context of electrically heated windshields, the purpose of the heating elements is to prevent ice and fog from forming. However, if there is arcing, it disrupts the intended heating pattern and may result in certain areas becoming excessively hot compared to the rest of the windshield. This can compromise both the structural integrity of the glass and the overall effectiveness of the windshield heating system, posing safety concerns for pilots relying on clear visibility.

The other options do not represent valid outcomes of arcing. For example, improved clarity for pilot visibility and increased durability of the glass are not associated with arcing, as any damage from arcing would actually hinder clarity and weaken the glass. Smoother airflow is also unrelated, as airflow is affected by surface conditions more than by electrical faults such as arcing.