Erj

[b8tme]

Help with ERJ

What is the difference between the ER / LR / XR in referance to the ERJ. What is A1E. What does ISIS stand for?v Also, What is Dry Motoring? And finally, What is a hung start?

 

[Cows Go Moo]

That's a lot, but briefly...

ER/LR/XRs are different series of the E145. Just like the B737 has several series, 200/300/700/etc. There are minor differences on the E145 between the different models in terms of engine rating and fuel capacity. The XR has winglets. ER is the most restricted in range. Next is the LR, which is probably the most common one out in the world right now. XRs have the best range. The extra fuel and winglets make that happen.

The A1E is just an engine model. Each company chooses certain engines with certain thrust ratings and inspection/overhaul intervals. There are many engine models out there. My company, Mesa, uses the A1.

ISIS stands for Integrated Standby Instrument System. It's a single instrument tube that indicates the three standby instruments' info: speed, altitude, and attitude. Our planes don't have those and instead have the older, more traditional three round instruments. Standby instruments are either air driven (no power souce required) or have an independant power source of some kind.

Dry motoring is turning the engine with the pneumatic starter but for the purpose of moving air thru the engine, not for starting it (by introducing fuel and ignition). It's good for evaporating fuel that may have pooled in an engine after getting no light off (ignition) during a start attempt.

A hung start is an engine start in which the turbines don't spool up to their normal RPMs. It could happen for a number of reasons, but it's a bad thing. One doesn't want to let an engine hang for a very long period of time during a start. It could ruin your whole day.

 

[b8tme]

RE: ERJ

I really appreciate it. That helps alot.
Thanks