Igniter plug replacement on B737 ✈️ Do you know what it is used for? 📸 by ig/tekniktekar1yer

Aids with the "Bang" portion of Suck, squeeze, bang, blow, cycle

Igniter make fire. Fire make engine spin. Engine make airplane go.

For starting fuel burning and if necessary to ensure it keeps burning if there's heavy rain or other adverse weather

It is a posh word to describe a spark plug

To make the 'tick, tick, tick' sound telling you to put your hearing protection in

Not a certified aircraft mechanic, nor any type of aircraft mechanic….. but is a crescent wrench really an allowable tool for your igniter plug replacement?

Engine start, plus other situations where a flameout would be possible or inconvenient, such as takeoff, landing, icing, turbulence, heavy precip.

Sparky.

Does it function like glow plugs in a diesel engine?

Like a spark plug basically. An igniter plug on an aircraft is used to ignite the fuel-air mixture in the combustion chamber of a jet engine, typically during engine startup.