Aeronautics: structure, systems, avionics and general aviation
A plane has three big jobs for trades. Structure workers care for the body, wings and tail. Systems workers care for engines, fuel, brakes and landing gear. Avionics workers care for radios, screens and computers (avionics means aviation electronics).
General aviation means small planes, helicopters and flying clubs, not big airlines. The same three trades work on them, often in a small workshop.
Safety rule: every check is written down, because a missed check in the air cannot be fixed later.
Mechanical and industrial manufacturing trades
A foundry worker pours melted metal into a mould. A pattern maker first makes the model that shapes the mould. Industrial boilermaking means cutting, bending and welding thick metal sheets into tanks and boilers.
A machinist uses machines such as the lathe to cut a part to the exact size. Tiny parts, like those in a watch, belong to microtechnics. Materials treatment is heating or coating metal to make it hard or rust-proof. Tooling maintenance means keeping cutting tools and moulds sharp and fit for the next job.
The 3D shows four stages: raw block, rough shape, smooth machined part, heat-treated part.
Digital and energy transition trades
The world is moving to clean energy and connected homes. An installer fits solar panels, heat pumps and boilers. A refrigeration technician looks after fridges and cold rooms, which also use heat pumps. An energy efficiency technician finds where a building wastes power.
An electrician wires homes and smart (connected) devices. Digital trades cover safety and security (alarms, cameras), audiovisual and home systems (TV, sound, smart speakers) and networks (cables and Wi-Fi that join devices).
In the 3D, more sun gives more power, and the heat pump fan spins faster.
Vehicle and equipment maintenance
Technicians keep cars, lorries and buses (road transport) and motorcycles on the road. Others keep farm machines like tractors, construction and handling machines like cranes and forklifts, and green-space machines like lawn mowers and trimmers working.
Every repair job follows the same four steps: find the fault, inspect, repair, test. The job is finished only after the test.
Automated installations
In an automated line, machines do the repeating work and people watch and fix. A sensor senses things (like a box passing). A controller decides what to do. A motor moves the belt.
A production line operator runs the line. Technicians in chemical, water and paper plants watch pipes, tanks and pumps. A sawmill technician runs log-cutting machines. Connected production maintenance means fixing machines that send data over a network.
Try it and stay safe
Try it in 3D: pick a trade, move the slider, and guess what changes before you look. At home, find one machine and name its sensor, its motor and its safety part.
All trades share safety habits: wear the right gear, switch off power before repair, and write down every check.
Key formulas and definitions
- Five families: aircraft, mechanical and industrial manufacturing, digital and energy, vehicle and equipment maintenance, automated installations
- Aircraft = structure + systems + avionics
- Repair job = find fault, inspect, repair, test
- Automation = sensor (sense) + controller (decide) + motor (act)
- Items per minute = belt speed / gap between items
Worked examples
1. A technician must fix a plane radio that crackles. Which aircraft area is this?
Radios are electronics, so it is avionics.
2. A part is cut from a 40 mm round bar down to 34 mm diameter on a lathe. How much metal is removed from the radius?
Diameter drops by 6 mm. The radius drops by half of that: 3 mm.
3. A sensor counts 8 boxes each minute. How many in 15 minutes at the same speed?
8 x 15 = 120 boxes.
4. Put these in order for a machined part: heat treatment, raw block, machining, casting.
Raw block, casting, machining, heat treatment.
5. A belt moves 0.5 m each second and boxes are 0.25 m apart. How many boxes pass the sensor in one minute?
In 1 second, 0.5 / 0.25 = 2 boxes. In 60 s: 2 x 60 = 120 boxes.
Common mistakes
- Thinking all engineering jobs need a college degree. Many skilled trades are learned in vocational schools and workshops.
- Skipping the final test in a repair. A job is done only when the test passes.
- Mixing avionics (electronics) with systems (engines, fuel, brakes).
- Believing automation removes people. People plan, watch and repair the machines.