Mobile Repair Station: IMSR739K

Morefield Aviation was established as a Repair Station for Aircraft Dynamic Propeller Balancing in 1983.  This authorization from the FAA included the designation as a Mobile service.  This authorizes Morefield Aviation to perform Dynamic Propeller balancing on propeller driven aircraft anywhere the FAA has jurisdiction.  In addition the process specifications, which are part of the repair station procedures, authorizes adjusting any static weights as required to aid in the Dynamic Balancing of the propeller assembly.  This often minimizes or eliminates drilling as part of the balancing process.


This repair station was founded by Robert Morefield who was previously the vice president and general manager of Chadwick Helmuth, the company that invented track and balance for helicopters and dynamic balancing of propellers.

Mr. Morefield’s educational background includes the following:

Bachelor of Science degree in Electronic and Mechanical Engineering from California State University and increasing levels of technical responsibility in the aircraft manufacturing business.

Fixed wing Commercial, multi engine, Instrument rating, Commercial helicopter, 3700 total time, 500 hours helicopter time.

FAA Repair Station Profile: WWW.FAA.GOV

SYMPTOMS OF IMBALANCE: Aircraft Dynamic Propeller Balancing
Cowling and baffling excess wear
Operator and passenger fatigue
Engine mount stiffness rapidly degrades allowing excess engine motion
Accessories towards the rear of the engine are subjected to high vibration levels causing premature failure
Instrument panel instruments are subjected to excessive vibration which dramatically shortens gyro bearing life
Wiring and cabling subject to faster degradation due to continuous vibration

PROPELLER TYPES THAT CAN BE BALANCED: Aircraft Dynamic Propeller Balancing
Fixed pitch with a spinner
Variable pitch with a spinner
Fixed pitch Radial engines with a spinner or means to add or remove weights.
Reverse turning Radial engines with a spinner or means to add or remove weights.
Turbine engines with geared and direct drive. The geared type is very sensitive to propeller unbalance since it causes premature wear in the gear section.

BENEFITS: Aircraft Dynamic Propeller Balancing
Minimize vibration
Increase bearing life
Minimize power loss
Minimize audible and signal noises
Minimize structural stresses
Minimize operator annoyance and fatigue
The tachometer error is measured engine internal vibration spectrum is measured and recorded for comparison with desired levels to identify potential problems

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