Ooops, forgot to answer.

 

The igniter you see is mounted directly on the engine. On this igniter (2 per engine), you connect the ignition power plugs, big shielded (and sometimes vented) cables, running to the ignition high power boxes, generating the ignition spark (lightning should I say :D ).

 

Thoses igniters make the "TAC TAC TAC TAC" you can hear when a jet engine is starting.

 

Cheers :)

 

Lightning indeed! As I always remind new mechs working on around jet engines for the first time in our shop, the voltage and current levels utilized on the igniters are nothing to fool around with.

 

If you accidently make contact with the "hot" end of the spark plug wire from a piston engine magneto, you'll get a nasty jolt that might hurt for a few moments, but that's about it... ditto for a typical automotive ignition system.

 

On the other hand, a jet engine's igniter box generates more than enough amperage to kill someone... especially if they get hit by the charge more than once.

 

 

 

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Question, how often are fluids such as engine oil or hydraulic fluids changed or does the oil get changed only during an engine overhaul?

Question, how often are fluids such as engine oil or hydraulic fluids changed or does the oil get changed only during an engine overhaul?

For the engine oil, we just do a replenish every day, after every flight (or if maintenance actions needed to drain oil). Otherwise, it's done during engine overhaul, at the engine shop. The engine burns a little bit oil while running, up tu 0,8 L/Hr is permitted on GE90. And the GE90-90/94 consumes more than a -110/115 !!

 

For the starter and IDG oil (also engine oil, but not interconnected), we do change it, every 600 to 800 flight hours maybe, depending on the aircraft... so every 2 months I guess on long haul planes (more likely every month on short haul planes, as the do more cycles per day)

Great Pics!! Thanks for sharing :D

Ooops, forgot to answer.

 

The igniter you see is mounted directly on the engine. On this igniter (2 per engine), you connect the ignition power plugs, big shielded (and sometimes vented) cables, running to the ignition high power boxes, generating the ignition spark (lightning should I say :D ).

 

Thoses igniters make the "TAC TAC TAC TAC" you can hear when a jet engine is starting.

 

Cheers :)

 

Thanks, I always wondered what the TAC TAC sound was.

Just found a nice vid :)

 

 

 

Edit:

And another one, it says it's an igniter from a LM1500, so basically a GE CF6 without the fan, only the gas generator, for industrial applications.

 

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Neat vid on a 777 engine change.

Am I crazy or is the intake cowl diameter on the RR and PW powered T7's smaller than the GE90 cowl?

Youre not crazy. They are smaller.