Hot section inspections of aircraft, Other Engineering

Assignment Help:

Hot Section Inspections (HSI's)

The hot section includes all components in the combustion and turbine sections of the engine. Scheduled inspections may involve visual inspection of hot section components, and limited dimensional checks and fits and clearances as called up in the maintenance schedule and described in the AMM. The term ‘hot section inspection' is usually interpreted to indicate a time related inspection of the hot section components. It may also be required following an over-temperature condition or hot start.

Some more in depth HSI's will require the removal of major components of the hot section. The modular construction of most modern gas turbine engine will enable this removal element of the task to be carried out on the wing, thus reducing the down time. To reduce this down time figure even more, some operators maintain a stock of ‘hot section' modules that are ready for immediate replacement, the removed item being returned for inspection to the operators overhaul facility.
201_hot section insepection.png 
Disassembly of Hot Section.

The disassembly/reassembly process must ensure that component parts are reassembled in the same position they came apart from. This will require marking of components. A note of caution here. When marking any hot section component do not use a marker that will leave a carbon deposit. Hot metal will absorb carbon which can lead to intergranular stress and failure of the component.

Line Inspection of Combustor Turbine Section.

On wing inspection of the combustor turbine section can be done visually through the jet pipe using a strong light source and a mirror and if required a magnifying glass. Boroscope inspection is also used as is, on occasion, non destructive methods of inspection such as dye-penetrant. As in other hot section inspections, the AME is most likely to see small cracks caused by compression and tension loads during heating and cooling. Other than on turbine blades and discs this type of distress is normally acceptable because after initial cracks relieve the stress, no elongation of crack normally occurs.

Erosion of blades and NGVs is also quite common, this brought about as a result of the wearing away of metal due to either the gas flow or impurities within the gas flow.

Combustion Section.

One of the most common faults found in the combustor section of a gas turbine engine is cracks. The combustion liner is made of a high temperature resistant steel that is subjected tom high concentrations of heat. The most common methods of checking for faults is by boroscope. With this tool the AME can easily view the internal combustion liner and fuel nozzles, and determine their airworthiness. During the inspection the AME is looking for signs of cracking, warping, burning, erosion and hot spots which may have developed possibly as a result of burner misalignment. What is observed is then compared with the manufacturers limitations.

1915_hot section insepection1.png

1493_hot section insepection2.png


Related Discussions:- Hot section inspections of aircraft

Communications system, Communications System • Information Source - ...

Communications System • Information Source - Information may take many forms: data, image, voice, video • Transmittter - Processes information into a form suitable for

Propeller track, PROPELLER TRACK An out of track propeller will suffer ...

PROPELLER TRACK An out of track propeller will suffer an imbalance caused by the Dynamic and Aerodynamic being out of balance. Propeller track is the path followed by a blad

Thermofluids 1- aeronautical option, general energy equation, non- flow ene...

general energy equation, non- flow energy equation, steady flow equation, joule''s law

Fractional distillation in fuel - aircraft maintenance , Fractional distill...

Fractional distillation This process is carried out in a fractionating column, which has a series of trays as shown in the figure. The effect of the superheated steam on the h

Building economics, with sketches,describe single upper flows

with sketches,describe single upper flows

Flight fine pitch stop failure, FLIGHT FINE PITCH STOP FAILURE (OVERSPEED) ...

FLIGHT FINE PITCH STOP FAILURE (OVERSPEED) An overspeed is prevented by an automatic coarsening device. A switch mounted on the Hub closes when the blade angle is below Flig

Static electricity in aircraft, Static electricity in aircraft: As ment...

Static electricity in aircraft: As mentioned earlier, the effects of static electricity are of considerable importance in the design of aircraft and aircraft equipment. An air

Methods of forging, Q. Describe briefly the following methods of forging : ...

Q. Describe briefly the following methods of forging :        (i) Drop forging        (ii) press forging Ans.  (i) Drop Forging: It is also called die

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd