Which are the two main sections of a turbine engine for inspection purposes?
For inspection purposes, the turbine engine is divided into two main sections: the cold and hot. Maintenance of the compressor, or cold section, is one of concern because damage to blades can cause engine failure.
What is turbine engine maintenance?
Routine inspections on engine components such as fuel nozzles, ignitors, fuel and oil filters, and compressor bleed valves have been performed. Time limited components on the engine have been inspected and repaired. You have become proficient in rigging the engine system and have even performed hot section inspections.
How are jet engines inspected?
Magnetic particle testing for aircraft engines detects surface and shallow subsurface discontinuities in ferromagnetic materials—iron, cobalt, nickel, and others—using magnetic fields and particles. When an item is being magnetized, discontinuities shift toward the direction of the field, causing a leakage field.
How would a mechanic inspect a turbine engine for suspected FOD?
Inspect the combustion chambers and covers for cracks by using visible dye or fluorescent penetrant inspection method. Any cracks, nicks, or dents are usually cause for rejecting the component. Inspect the covers, noting particularly the area around the fuel drain bosses for any pits or corrosion.
What are the 3 main sections of a turbine engine?
The compressor section 3. The combustion section (the combustor) 4. The turbine (and exhaust) section. The turbine section of the gas turbine engine has the task of producing usable output shaft power to drive the propeller.
How is EPR calculated?
To determine EPR, pressure measurements are taken by probes installed in the engine inlet and at the turbine exhaust. The data from these sensors is sent to a differential pressure transducer which then indicates the ratio of the two pressures on a flight deck EPR gauge.
What is gas turbine inspection?
The inspection generally includes that of the combustion chamber outlet ducts, covers and turbine fuel nozzle for blockages, cracks, pits and corrosion in addition to the inspection of the first stage turbine blades and nozzle guide vanes for warping, cracks, or foreign object damage.
What items are checked in a hot section inspection of a turbine engine?
A hot section inspection (HSI) involves examining the condition of a number of key engine parts, including the turbine blades, the combustion chamber, the stators, the vane rings, the compressor turbine disk and the shroud segments. A hot section inspection is performed on a PT6 engine.
How often is a jet engine serviced?
Depending on the type, an engine has to be taken apart, cleaned and serviced every 3,000 or more flight cycles. This means an engine receives a major overhaul every five years, in addition to more frequent, less radical visits to the workshop.
What is turbine entry temperature?
Advances in cooling technologies have enabled turbine designers to push the turbine entry temperature to temperatures as high as 1700°C which are well beyond the material limit of the turbine components. Efficient use of the cooling air is a key goal of the turbine designer.
What is NP in a turbine engine?
Np: Indication of propeller rotation speed. Constant speed of the propeller in Y12 (II) aircraft is 2,200 rpm. Usually, propeller speed does not attain constant speed of 2,200 rpm until Ng >86-89 percent.
What is N1 and N2 in jet engines?
N1 is the rotational speed of the low pressure turbine and compressor spool expressed as a percentage of the maximum normal operating RPM of the spool. N2 is the rotational speed of the high pressure turbine and compressor spool expressed as a percentage of the maximum normal operating RPM of the spool.
What is G value in EPR?
This value contains the chemical information that lies in the interaction between the electron and the electronic structure of the molecule, one can simply take the value of g = ge+ Δg as a fingerprint of the molecule. For organic radicals, the g value is very close to ge with values ranging from 1.99-2.01.
How often should gas turbine be maintenance?
Inspection and maintenance intervals The recommended maintenance intervals are similar for most makes of gas turbines. These are: Combustor inspection at 8,000 equivalent operating hours (EOH) Hot gas path component at 24,000 EOH.
What is the gas turbine maintenance procedure?
This article relooks into industrial gas turbine maintenance….Gas Turbine Repairs
- Removal of old coating and application of a new one.
- Welding to rebuild geometry.
- Heat treatment to rejuvenate material condition.
- Change in design and materials (advanced procedures)
How are hot sections inspected?
How often are commercial jets inspections?
Commercial airplanes require frequent maintenance to offer a safe flying experience. They typically undergo a basic maintenance inspection once every two days, followed by a more thorough heavy maintenance inspection once every few years.
What is the maximum turbine inlet temperature?
(MHI) has achieved the world’s highest turbine inlet temperature of 1,600 degrees Celsius (°C), with the company’s most advanced “J-Series” gas turbine.
What is tit in gas turbine?
Turbine Inlet Temperature (TIT) is the temperature of the combustion chamber exhaust gases as they enter the turbine unit. The gas temperature is measured by a number of thermocouples mounted in the exhaust stream and is presented on a flight deck gauge in either degrees Fahrenheit or degrees Celcius.