Before using a cable rigging chart, what information is essential?

The correct answer is based on the importance of understanding cable properties to ensure accurate rigging. Knowing the cable size is crucial because different sizes have varying tensile strengths and characteristics that affect their performance and behavior under load. Additionally, ambient temperature can significantly influence the properties of the cable material; for instance, steel cables can become more brittle in colder temperatures, while other materials may expand or contract.

This understanding enables the technician to make informed decisions regarding the tension and adjustment needed for proper rigging, as cable performance can change with temperature variations and the inherent properties associated with different cable sizes. Incorporating these factors ensures operational reliability and safety.

In contrast, the other options—altitude of operation, airflow speed, and the type of aircraft structure—do not directly impact the effectiveness or the specified adjustments for cable rigging on the same level as cable size and temperature considerations. Therefore, they are less critical to the preliminary steps before using a cable rigging chart.