How many trim tabs are on the rotor assembly and which one should not be touched?

• A. 2 tabs; metal trim tab
• B. 3 tabs; plastic trim tab
• C. 4 tabs; aluminum trim tab
• D. 1 tab; carbon fiber trim tab

Answer: (B)

The question pertains to the rotor assembly and the specific types of trim tabs that are present. Understanding the number and material composition of these trim tabs is crucial in maintaining the integrity of the rotor system and ensuring safe operation.

The correct answer indicates that there are three tabs made from plastic. This is significant because rotor assemblies often utilize trim tabs to adjust the aerodynamic performance for optimal flight characteristics. The material of the trim tab is essential because specific materials can withstand different impacts and stresses that occur during flight.

In particular, the caution against touching the plastic trim tab relates to the vulnerability of plastic in high-stress environments. Plastic may not have the same durability or repairability as metals or more robust materials. Thus, it is imperative for a technician or operator to avoid modifying or handling the plastic trim tab without proper expertise to prevent unintended alterations to the rotor's aerodynamics.

Additionally, the identification of three tabs is also applied in the context of effective trim adjustment, as having multiple options allows for more precise tuning. The specifics about the count and material help in ensuring that operational procedures are adhered to, promoting both safety and efficiency in the lifting system.