The actual overhaul period for a specific engine is generally
determined by the manufacturer’s recommendations.
Receiving Inspection
consists of determining the general condition of
the total engine as received, along with an
inventory of the engine’s components.
Inspection Process
Visual
Cleaning
it is important to clean all engine
parts thoroughly to facilitate further
inspection.
Degreasing
Removing Hand Carbon
Structural NDT
Check your visual
inspection with
nondestructive
testing.
Ultrasonic Inspection
Eddy Current Inspection
Dye Penetrant Inspection
Magnetic Particle Inspection
X-Ray
Dimensional
Is used to assure that the engine’s
component parts and clearances meet the
manufacturer’s specifications.
Reassembly
Before starting reassembly, all
serviceable and new engine
components need to be cleaned,
organized, and laid out in the
order they are to be assembled.
Installation and Testing
Engine Testing of Reciprocating Engines
Test Cell Requirements
Engine Instruments
Torquemeter
Cylinder head temperature gauge
Exhaust gas temperature gauge
Tachometer
Fuel pressure gauge
Fuel flowmeter
Manifold pressure gauge
Oil temperature gauge
Oil pressure gauge
Carburetor air temperature gauge
Reciprocating Engine Operation
The term engine instruments
usually includes all
instruments required to
measure and indicate the
functioning of the
powerplant.
Engine Warm-Up
Ground Check
Hydraulic Lock
Pre-Oiling
Engine Starting
Propeller Pitch Check
Fuel Pressure and Oil Pressure Check
Engine Instruments
Engine Stopping
Indle Speed and Idle Mixture Checks
Power Check
Basic Engine Operating Principles
Combustion Process
Detonation
Pre-Ignition
Backfiring
Afterfiring
Turbine Engine
Turbine Engine Maintenance
Compressor Section
Inspection and Cleaning
Causes of Blade Damage
Bleding and Replacement
Combustion Section Inspection
One of the controlling factors in the service life
of the turbine engine is the inspection and
cleaning of the hot section.
Turbine Engine Instruments
Torquemeter (Turboprop Engines)
Engine Pressure Ratio Indicator
Tachometer
Exhaust Gas Temperature Indicator (EGT)
Fuel-Flow Indicator
Engine Oil Pressure Indicator
Engine Oil Temperature Indicator
Turbine Engine Operation
Ground Operation Engines Fire
Engine Checks
Ambient Conditions
Cheking Takeoff Thrust
Turboprop Operation
Turboprop engine operation is
quite similar to that of a
turbojet engine, except for the
added feature of a propeller.
Turbine Engine Calibration and Testing
Some of the most important factors affecting turbine
engine life are EGT, engine cycles (a cycle is generally a
takeoff and landing) and engine speed. Excess EGT of a
few degrees reduces turbine component life. Low EGT
materially reduces turbine engine efficiency and
thrust.