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Motor Mount and Arm Lock Check

On an aircraft with folding arms, what must be confirmed after unfolding it for flight?

  • A.Arms should remain slightly loose so they can flex in turbulence
  • B.Each arm is fully extended and locked securely in its flight position
  • C.Only the arms carrying cameras need to be locked
Correct answer

B. Each arm is fully extended and locked securely in its flight position

Why

Folding mechanisms introduce a joint that must be locked before load is applied. An unlocked or partially seated arm can fold or flex in flight and cause loss of control.

Source: FAA-G-8082-22 Ch. 12 · ACS knowledge area: Maintenance and Preflight Inspection Procedures · From the Maintenance & Preflight Inspection practice bank (MNT-032).

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