VoiceOfReason

I recall the Chief talking about "FAM" flights and the importance of them. You can work with Scheduling to secure your spot in the seat. If you go into the flight with the purpose of trying to learn, I'd say go for it.

prex8390

No, they'll even get you a positive space ticket home on the weekends in training. I'd say they encourage it, especially if it's in Endeavor metal.

Green Needles

If you bump a commuter, you'll be frowned upon. I know you're excited, but riding the JS gets old. It's uncomfortable and cramped. If you're joyriding, don't, focus on training. If you're wanting to learn, training will put you on a couple FAM flights (jumpseats). Learn from those and focus on your training. If you really need to get somewhere, use your positive space to/from home during training.

legend

You can do the two FAMs anytime in training. I don't think they were talking about doing it just to commute home but the two your required to do can be to your home if it ends of working out that way. If a jumpseat gets bumped, then that's the way it works. Its required to do the FAM. Lighten up Francis!

Happyflyer

Ballsy move, your saying on the 200 if you turn on the battery then flip the gen switch to on, then start the APU you won't get get an AC until the gen is on line?
I think the GCU just won't transfer form GPU to the APU but if you didn't have AC power already on it would try to power the plane.
I knew a guy who shutdown the APU with the gen switch on and both engine gen switches off and AC power wasn't immediately lost power remained while the gen spoiled down and he was able to get an engine gen switch before everything went out.
According to you and I'am not positive the GCU would have isolated the apu gen killing AC power immediately.

Either way his post is relying on the premise that the engineers knew he wouldn't care or wouldn't understand and idiot proofed it for him, so now he's at peace with himself because he's been made aware of said idiot proofing, which is still ignorant.

FODhopper

Oh the wasted scrolling.. Several pages now..... Then a useful comment or tidbit. Then more waste. Very little illumination... Just posturing...

Strive for erudition, not excoriation.

sweetholyjesus

You'll have to forgive me FOD, it was just too tempting. Not only does he try to insult someone's intelligence while using incorrect grammar, but also shows that he does not understand how the CRJ200 electrical system works. The irony was there, was it not?

HighFlight

Sort of. The GCU protects against under/over voltage and frequency. I cannot remember the percentages off the spec values of 115 Vand 400 Hz, been too long since I had to memorize them.

When you power up as you described, the GCU will keep power off the plane until the undervoltage and underfrequency values are passed. What you'll see/hear is a lower voltage than normal, but it's not like you will see the voltage rise from 0 to 115 V. Probably more like 95 V to 115, but that's a quick second. Same thing if you shut off the APU first then the generator. You'll hear the electric flow and see the lights dim until the GCU disconnects to save the avionics and such.

In operation, the GCU senses a power drop, allows more voltage to pass from the PMG (Permanent Magnet Generator) built into the generator back into the GCU and then into the windings of the generator, which then increases voltage output of the generator to meet the demand. That's how we are able to maintain volts and hertz at such a small range of fluctuation as loafs change.

Hopefully that clears up any previous confusion I may have caused.

And as for the previous poster who said that the green light means power is good after the GCU... not quite. It just means there is power at the external power monitor panel. As in available for the GCU to check it when you press the switch in. Push the switch with "bad" power, and the light stays green, but the GCU won't allow power to travel thru it to the plane. Similar to the light on a power strip when you plug it into the wall; it means that power is there, but unless you plug in your device, no power is flowing anywhere.

WhiskeyKilo

As electrifying as this conversation is I think we have beaten this dead horse enough.

On a completely unrelated note; could someone please tell the curriculum developers to remove the mic from their throats when they are doing the voice overs for the LMS modules. Many thanks.

Happyflyer

Well that's certainly more in depth than I've learned since I stated flying it, but you can burn up electrical components with under amperage. I had to look it up, but the poster would have to know that the current amperage demand is under 150 if the apu is running, plus what the engine gen is producing at the time the GCU allows it pass through. Or he'd just be relying on circuit breakers popping. Granted it would have to be under a heavy draw. I apologize for an impolite comment regarding his knowledge, but a successful engine start with gen switch on in no way validates it as harmless. Even with the GCU monitoring volts and hertz.