Airframe Mechanic Certification Assembly and Rigging 3

Question 1

On a helicopter, tracking the main rotor blades is done to ensure:

Accepted Answer

All blades rotate in the same plane of rotation

Answer

Rotor tracking verifies that all blades rotate in the same plane to minimize vibration caused by out-of-track blades.

Question 2

What is the function of a jury strut on a semi-cantilever wing?

Accepted Answer

Prevents the interplane strut from bowing under compression loads

Answer

A jury strut braces the interplane or wing strut at its midpoint to prevent bowing or buckling under compressive loads.

Question 3

When checking flight control surface travel with a protractor, where is the protractor typically placed?

Accepted Answer

On the top surface of the control surface at the specified reference location

Answer

The protractor (or inclinometer) is placed on the top surface of the control surface at the reference station specified in the maintenance manual.

Question 4

When rigging pushrods, what condition should be avoided to prevent binding or misalignment forces on the rod-end bearings?

Accepted Answer

Allowing the pushrod to carry side loads due to misalignment

Answer

Rod-end (rod end) bearings are designed for axial loads; side loads from misalignment cause premature wear and possible failure.

Question 5

The rigging pin (alignment pin) used during assembly of a control surface to the airframe is intended to:

Accepted Answer

Hold components in precise alignment for installation of fasteners

Answer

Rigging pins temporarily hold parts in the exact alignment position specified by the manufacturer so that fasteners can be installed correctly.

Airframe Mechanic Certification Practice Test