FAA Powerplant Written Practice Test

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

Practice this question and more.

During installation of a propeller on a smaller aircraft engine with a keyed propeller shaft, to which position is the keyway aligned?

Bottom dead center
Number 1 at TDC
Middle of the stroke
Top dead center

The correct answer is: Number 1 at TDC

The keyway in a keyed propeller shaft is aligned with the number 1 cylinder at top dead center (TDC) during the installation of a propeller on a smaller aircraft engine. This is essential for ensuring proper timing and alignment of the propeller to the engine's rotation. When the engine is at TDC for the number 1 cylinder, it is in a position where it is ready to produce power. Aligning the keyway with this position promotes the efficient transfer of power from the engine to the propeller, reducing the risk of misalignment and potential vibration issues. Aligning the keyway to TDC also reflects the need to synchronize the propeller's blades with the engine's power strokes. This alignment helps achieve optimal performance and efficiency of the propulsion system, allowing for effective thrust generation when the aircraft is in operation.