Well, now that you say the cable can still be connected, I really don't know what else requirements should be met. Most obviously the power needs to be online, ok. Other than that the voltage, frequency etc should be in useful ranges. Wow, guess you've lost me on that one already LOL :(Hm I wouldn't say so, because the label says "GND POWER AVAILABLE", not that it's necessarily in use. If it is, though, the bus off lights should extinguish, still I stand to be corrected. :(

ok then, the switch is on for GND power and then the blue light is extinguished. Same gappens when my APU available light is on until you select it, then it extinguishes

Ok, Etienne you were on a bit of a roll there with your last post.Its pretty simple. If the GND power is connect AND the GROUND POWER QUALITY has been met for the aircraft electrical system THEN the GND power light will illuminate. So obviously if the voltage is slightly under the required voltage the GND power light won't illuminate. IF the correct electrical requirements have been met the GND power light will ALWAYS stay illuminated and will NEVER extinguish as long as the gnd power is pumping out the correct electrical requirements. Does that sound easy to understand? I can be bad at getting my point across in a post sometimes.Jack C

Ok, Etienne you were on a bit of a roll there with your last post.Its pretty simple. If the GND power is connect AND the GROUND POWER QUALITY has been met for the aircraft electrical system THEN the GND power light will illuminate. So obviously if the voltage is slightly under the required voltage the GND power light won't illuminate. IF the correct electrical requirements have been met the GND power light will ALWAYS stay illuminated and will NEVER extinguish as long as the gnd power is pumping out the correct electrical requirements. Does that sound easy to understand? I can be bad at getting my point across in a post sometimes.

Hey, thanks for the update (but where's the new Q? Gettin dark outside here again hahah :(). Well, as you explain it is pretty clear to me, bascially just as I thought. So the two conditions are simply 1^st power avail and 2^nd voltage etc fit aircraft demand. And the light will show exactly what it is labeled, power AVAIL so even whenever it's in use it will still remain bright since, technically, power is obviously still avail... alright, enuff of this. Great! :(PS: May I ask a question as well and would it be ok to do a little picture quiz too? If yes, what part do you think can be seen here, talking about the green moon shape and associated parts?

Hey, thanks for the update (but where's the new Q? Gettin dark outside here again hahah :(). Well, as you explain it is pretty clear to me, bascially just as I thought. So the two conditions are simply 1^st power avail and 2^nd voltage etc fit aircraft demand. And the light will show exactly what it is labeled, power AVAIL so even whenever it's in use it will still remain bright since, technically, power is obviously still avail... alright, enuff of this. Great! :(

yep all right BUT even when the GND power is NOT in use but still plugged in the GND power light will still be ON. It doesn't have to be the source of power that is running the aircraft system. As long as its plugged in, meets electrical requirements that blue light will be on. The APU could be the source of power for the aircraft but the GND power light can still be on.Jack C

Alright, I'm back now.........let's rock!

ok next question. (first multiple guess Q)How bad was my last landing? a) greatb)goodc) the pitsd) so bad that this is the first time the paying public were glad they had the extended medical coverage that had full chiropractic coverageJack Cbe nice now!

PS: May I ask a question as well and would it be ok to do a little picture quiz too? If yes, what part do you think can be seen here, talking about the green moon shape and associated parts?

it IS a part of the front wheel... So i'd guess it's a reference for wear of the shock absorber? :(

ok next question. (first multiple guess Q)How bad was my last landing? a) greatb)goodc) the pitsd) so bad that this is the first time the paying public were glad they had the extended medical coverage that had full chiropractic coverageJack Cbe nice now!

Hmmmm, last post of yours I read you mentioned flying redeyes, that must hit you in the fatigue department so I'm gonna guess C. PS - it was an educated guess, I wasn't been mean :)

How bad was my last landing? a) greatb)goodc) the pitsd) so bad that this is the first time the paying public were glad they had the extended medical coverage that had full chiropractic coveragebe nice now!

Alright, will do: A).Oh, btw I love your wording, not "how was my last landing" but instead "how bad" it actually was... great! :(

it IS a part of the front wheel... So i'd guess it's a reference for wear of the shock absorber? :(

Hey man, you're pretty close! We are indeed looking at the nose wheel, you might have told from the angle indication maybe (especially if you were aware of the max NW deflection). And yes, it sorta has to do with the shock absorber too... but it doesn't show its wear. Look close as to which part is attached to what. :( Any other guesses?

Hey man, you're pretty close! We are indeed looking at the nose wheel, you might have told from the angle indication maybe (especially if you were aware of the max NW deflection). And yes, it sorta has to do with the shock absorber too... but it doesn't show its wear. Look close as to which part is attached to what. :( Any other guesses?

Yup, the 78° gave it away, and another guess would be for a retracted/extended sensor.

Yup, the 78° gave it away, and another guess would be for a retracted/extended sensor.

Arrhhh... man, you're close! I assume you mean if the nose gear is retracted or extended? No, but hey, it's positively a sensor, just not the one for the red/green light in the cockpit (see below for the downlock sensor on the left picture, and you are right as it indeed looks and works very similar)... :( Now there's not much more room for speculation and I will lift it: it's a sensor telling if the NW is on the ground or not. The little dark grey thing is attached to the torsion link while the green thing is fixed to the shock strut. Whenever the gear is compressed the two will get close together like in the picture and trigger a signal. :Party:If it's ok for you I won't hesitate to continue the picture series, although I find some might be too easy while others might be way too difficult... how about this one? I suspect the former, but we'll see! :(

ouch could have thought of it, i had understood which parts were in the image. Just didn't think of the ground sensor. :) As for the two new pics should it be the same object in different views? The second one i'd say could be the flap extension system seen from inside the wing. while the first one could be a magnetic switch to confirm extension to a particular point.

The first one looks like the PSEU sensor and the second, as fozzy says, looks like the part inside the flap track.Jack C

From where does the No. 1 DC buss receive its power?What is the buss load?

Still waiting on an answer to this one from two pages back. Unless of course no one knows anything about the electrical systen on the NG.

As for the two new pics should it be the same object in different views?

Sorry as my arrangement of pics was a bit misleading - the two pics had nothing in common, I was just referring to the downlock sensor in my post and wanted to attach a pic of it too, while the right pic was the actual new question. And you all got it right, of course. We are looking inside one of the underwings pylons where we can see the flap track system and jackscrew. As I expected - too easy! :( So let's step up one tiny little bit:Big duct eh? Sorry for the blur, but those who know will recognize it anyways. :(Edit:Oh, and about your question. Let me guess under normal operation the DC bus 1 is powered by TR1/2 since it should be tied to DC bus 2, backed up by TR3. Whenever the cross bus tie relay opens obviously only TR1 remains. I know, that might only be part of your question so someone else is entitled to chime in haha... :(