Which duty is not permitted for an SIC with less than 50 flight hours?

The role of a Second in Command (SIC) with less than 50 flight hours is governed by specific regulations to ensure safety within operations. One critical restriction is that an SIC with insufficient experience, particularly less than 50 flight hours in the aircraft type, is not allowed to take off or land with passengers on board. This limitation is primarily established to mitigate risk, as these phases of flight are critical and require a higher level of proficiency and familiarity with both the aircraft systems and the operational environment.

Taking off and landing are high-stakes portions of the flight that can greatly affect the safety of the entire operation. By ensuring that only those with adequate experience and training are allowed to perform these tasks, regulatory bodies aim to facilitate safer flight operations.

On the other hand, the other duties listed, such as participating in flight planning, operating the aircraft under supervision, and performing in-flight duties, are permissible within certain conditions. These roles can help build experience without placing undue risk on the operation of the flight during the most critical phases.