Question

What are some of the general inspections to perform on a Hartzell propeller?

What is propeller end-play in a variable pitch propeller?

What is meant by dressing a propeller nick and stress riser?

When should a variable pitch propeller be considered for overhaul?

When and per what reference should a Harzell variable pitch propeller air charge be checked?

Answer 1

1)

aircraft propeller represents a significant investment in aircraft’s efficient operation, speed, and overall aesthetics. Usually, basic visual inspection is preferred probably once in a day to look around cracks, probable damages, erosion etc. Cleaning is the most important as insects and pollution can build over a period of time.

These are some key inspections checklist for Hartzell propeller.

1) Blade track

2) Loose blades

3) Corrosion

4) Spinner damage

5) Anti-ice system

6) Fire/heat damage

7) Foreign object strike damage

8) Over speed or Over torque

2)

the variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Propeller end play refers to a loose propeller.

3)

Nicks and scratches act as a stress raiser. Dressing a propeller lead to a decrease in stress concentration and hence the safety and life of the propeller increases.

4)

The manufacturer specifies the time limit like TBO ( Time between overhaul) or some opt for IRAN (Inspect and repair as necessary. The variable pitch propeller is considered to be overhaul when flight performance is drastically changed, or loose fittings corrosion is observed.

5)

When engine is running in ground, air charge is checked.