Question

___________ (TRIM UP/DN L/R) switch on each collective stick. Actuating this switch left or right at airspeeds less than 50 knots will cause the tail rotor pedals to drive until the helicopter attains a yaw rate of approximately 3° per second. When the TRIM beeper is released, heading hold is re-engaged to hold the new heading. Up and down inputs through the switch change the collective setting. Momentarily pressing the __________ button releases the Collective Trim Servo allowing the pilot to set a new collective position or FD reference."

Answer 1

The TRIM switch on each collective stick is used to adjust the yaw rate of a helicopter and the Collective Trim Servo button allows the pilot to set a new collective position or FD reference. Conservation of angular momentum ensures stability of the helicopter by counteracting the rotation caused by the main lift blades.

Step-by-step explanation:

The subject of this question is Engineering and the grade level is College. The TRIM switch on each collective stick is used to adjust the yaw rate of a helicopter. When the switch is actuated left or right at airspeeds less than 50 knots, the tail rotor pedals drive until the helicopter reaches a yaw rate of approximately 3° per second. Releasing the TRIM beeper re-engages the heading hold to maintain the new heading.

Additionally, pressing the Collective Trim Servo button momentarily releases the servo to allow the pilot to set a new collective position or flight director (FD) reference. Conservation of angular momentum is a principle that states that the body of the helicopter would want to rotate in the opposite direction to the main lift blades, but the tail rotor provides thrust to stabilize it.