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APU Looks Plugged On This Test Airplane  
User currently offlineCURLYHEADBOY From Italy, joined Feb 2005, 940 posts, RR: 2
Posted (7 years 11 months 2 weeks 1 day 20 hours ago) and read 4455 times:

Noticed this curious detail in the beautiful pic by Mariusz Adamski, the APU exhaust looks like there's a sort of plug inside, someone knows the reason why? Or is it just an optical illusion that I see...?



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Photo © Mariusz Adamski




If God had wanted men to fly he would have given them more money...
30 replies: All unread, showing first 25:
 
User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 1, posted (7 years 11 months 2 weeks 1 day 19 hours ago) and read 4438 times:

Yea that looks like a yellow butt plug there.

BTW, what is that guy in the red shirt doing on the side of the runway? Test plane coming down the runway, standing close by in a red shirt...doesn't sound like a winning combination.  Wink


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 2, posted (7 years 11 months 2 weeks 1 day 18 hours ago) and read 4425 times:

Yes, it's plugged.... but the APU is there and works. I never understood why they do that and I ment to ask the Brazilian Engineers when 170.0001 and 190.0002 paid us a visit....

Just a note: The serial number shown is wrong. That aircraft, PP-XMJ is 190.0005. All E170/175 and E190/195 have the same serial number groups as the aircraft is Type Certificated as the same.

[Edited 2006-08-19 16:09:29]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 3, posted (7 years 11 months 2 weeks 1 day 18 hours ago) and read 4417 times:

Quoting SP90 (Reply 1):
BTW, what is that guy in the red shirt doing on the side of the runway?

Looks to me like he is holding a camera. Remember, OSHA has no authority in Brazil.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offline777WT From United States of America, joined Jan 2005, 875 posts, RR: 1
Reply 4, posted (7 years 11 months 2 weeks 1 day 17 hours ago) and read 4395 times:

Quoting EMBQA (Reply 2):
Yes, it's plugged.... but the APU is there and works. I never understood why they do that and I ment to ask the Brazilian Engineers when 170.0001 and 190.0002 paid us a visit....

Just a note: The serial number shown is wrong. That aircraft, PP-XMJ is 190.0005. All E170/175 and E190/195 have the same serial number groups as the aircraft is Type Certificated as the same.

What is the difference between the 170 and the 175? I know LGA is to start getting 175's for US Airways within a few months since most of the 145's are going to CO express colors shortly.

One more thing, I was doing a NLG wheel change on Delta Shuttle 170 and I was standing under the fwd e-bay while changing the L/H NLG wheel. There was the jetbridge attached to it and the GPU was connected. My cochlear implant processor made a high pitched whine for like a min then shuts off. I had to turn it back on 5 times. This didn't happen when I did a NLG wheel R&R on the 145.
Could it be the fwd avioncs in close range or the GPU causing interference?


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 5, posted (7 years 11 months 2 weeks 1 day 16 hours ago) and read 4376 times:

Quoting 777WT (Reply 4):
What is the difference between the 170 and the 175?

Length.. that's it. There are two plugs addded. One forward of the wing, one aft of the wing. Now the E170/175 to E190/195 are very different. The E190/195 has bigger engines, bigger gear and sits much higher. I 'think' the E190 has a different wing. I didn't realise how different until we had a E190 parked next to a E170 in the hangar. The E170 looked like a toy.

Quoting 777WT (Reply 4):
Could it be the fwd avioncs in close range or the GPU causing interference?

That would be my guess. The Ejets use AC power, where the ERJ's use DC power at the gates. My guess would be the AC power frequancy was close and caused the interfearance. Also, above your head was a bunch of avionics, power units, converters so it could have come from anywhere.

[Edited 2006-08-19 18:10:45]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17001 posts, RR: 67
Reply 6, posted (7 years 11 months 2 weeks 1 day 15 hours ago) and read 4355 times:

Quoting SP90 (Reply 1):

BTW, what is that guy in the red shirt doing on the side of the runway? Test plane coming down the runway, standing close by in a red shirt...doesn't sound like a winning combination.

Obviously an A.nutter.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 7, posted (7 years 11 months 2 weeks 1 day 15 hours ago) and read 4345 times:

OK, so the plugged APU isn't the reason for smoke pouring from every orifice, then?  Smile

User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 8, posted (7 years 11 months 2 weeks 1 day 15 hours ago) and read 4344 times:

Those high-speed braking tests are something to witness. My club's planes are parked along side runway 10/28 at APA, and I recently got to witness Adam Aircraft performing the same on the A700 as I preflighted. There wasn't quite as much smoke, but I still thought it was impressive. Sadly, I didn't have my camera with me.


Position and hold
User currently offlineL-188 From United States of America, joined Jul 1999, 29791 posts, RR: 58
Reply 9, posted (7 years 11 months 2 weeks 1 day 15 hours ago) and read 4332 times:

My Guess....They plugged it because they where doing these runs through the water tank, and didn't want to flood it out.

All airplanes have to do this test, basicly the run the airplane through about 2 inches of standing water and watch where the spray pattern ends up-specificly not in the engines.

It isn't a braking test.

Quoting SlamClick (Reply 3):
Quoting SP90 (Reply 1):
BTW, what is that guy in the red shirt doing on the side of the runway?

Looks to me like he is holding a camera. Remember, OSHA has no authority in Brazil.

Exactly, you film it for the engineers to see what part of the designs they screwed up on.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineRichPhitzwell From , joined Dec 1969, posts, RR:
Reply 10, posted (7 years 11 months 2 weeks 1 day 13 hours ago) and read 4312 times:

Quoting David L (Reply 7):
OK, so the plugged APU isn't the reason for smoke pouring from every orifice, then?

Is that not steam and water spray? That would be a site to see though in a non fire situation.

I hear it now:
Hey, who's the wise cracker who put bananas in my APU tail pipe again!


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 11, posted (7 years 11 months 2 weeks 1 day 10 hours ago) and read 4260 times:

Quoting L-188 (Reply 9):
My Guess....They plugged it because they where doing these runs through the water tank, and didn't want to flood it out.

No, all the early test bed aircraft have the APU plugged, not just for this test. Why..? I forgot to ask..

Quoting David L (Reply 7):
OK, so the plugged APU isn't the reason for smoke pouring from every orifice, then?

That is not 'smoke'.. it's just water splashing up from the high speed taxi test. This test is done to make sure water does not splash up from the nose wheel directly into the intakes.



"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 12, posted (7 years 11 months 2 weeks 1 day 9 hours ago) and read 4241 times:

Quoting RichPhitzwell (Reply 10):
Is that not steam and water spray?



Quoting EMBQA (Reply 11):
That is not 'smoke'.

Thanks, guys, but I did read the replies prior to mine, hence the " ". But here's another one anyway:

Edit: Hmm... it seems no-one had mentioned the spray before my reply. Anyway, it was just a remark which wouldn't have worked with spray instead of smoke. I know the plugged APU wasn't causing smoke "to pour out of every orifice".  Smile

[Edited 2006-08-20 01:16:07]

User currently offlineRichPhitzwell From , joined Dec 1969, posts, RR:
Reply 13, posted (7 years 11 months 2 weeks 1 day 8 hours ago) and read 4216 times:

Quoting David L (Reply 12):
Edit: Hmm... it seems no-one had mentioned the spray before my reply. Anyway, it was just a remark which wouldn't have worked with spray instead of smoke. I know the plugged APU wasn't causing smoke "to pour out of every orifice".

I figured as much, but after posting, still would be fun to see bananas.


User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 14, posted (7 years 11 months 2 weeks 1 day 7 hours ago) and read 4209 times:

I would bet there is no APU installed and the plug is to keep any water out of the APU compartment. You can also see the fairing for the trailing cone at the top of the vertical stabilizer and there is a section of left hand elevator trailing edge missing.

Notice the position of the horizontal stabilized, trimmed stabilizer nose up, to insure there was no surprise lift off during the test.


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 15, posted (7 years 11 months 2 weeks 1 day 7 hours ago) and read 4206 times:

Quoting 474218 (Reply 14):
I would bet there is no APU installed and the plug is to keep any water out of the APU compartment.


As someone that has stood next to those aircraft with the APU running and the plug installed I can assure you it has an APU.......

Quoting 474218 (Reply 14):
You can also see the fairing for the trailing cone at the top of the vertical stabilizer and there is a section of left hand elevator trailing edge missing.

The extra fairing on top of the vertical is for a trailing sensor they roll out during flight test. As for the LH horizontal, I think your seeing the camera mout to record the test.



"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 16, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4200 times:

Quoting EMBQA (Reply 15):
The extra fairing on top of the vertical is for a trailing sensor they roll out during flight test.

I think that is what I said. The fairing at the top of the vertical stabilizer is for the for the trailing cone. A trailing cone is used to calibrate the pitot static system and it is let out to trail behind the aircraft in still air.

Quoting EMBQA (Reply 15):
As someone that has stood next to those aircraft with the APU running and the plug installed I can assure you it has an APU.......

Will if there is a plug installed the APU will not run, the exhaust has to go out somewhere.

Quoting EMBQA (Reply 15):
As for the LH horizontal, I think your seeing the camera mout to record the test.

I can see a yellow section starting about half way out on the horizontal that looks a lot like primer and there is a step between the inboard, aluminum colored section and outboard yellow section.


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 17, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4197 times:

Quoting 474218 (Reply 16):
Will if there is a plug installed the APU will not run, the exhaust has to go out somewhere.

True.. it exits out the top...
View Large View Medium
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Photo © Tim Feise - APO Photos


Here you can see a picture of 190.0001 with its APU plugged and the APU clearly running and venting out the top.
View Large View Medium
Click here for bigger photo!

Photo © Stephan Klos Pugatch




Quoting 474218 (Reply 16):
I can see a yellow section starting about half way out on the horizontal that looks a lot like primer and there is a step between the inboard, aluminum colored section and outboard yellow section.

I know during flight test they painted black, yellow and red patterens on the controls...maybe your seeing that..?

[Edited 2006-08-20 03:55:00]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 18, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4192 times:

Quoting EMBQA (Reply 17):
a picture of 190.0001

Whats the Story behind this numbering system used.Is it only Emb specific.
regds
MEL



Think of the brighter side!
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 19, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4185 times:

Quoting HAWK21M (Reply 18):
Whats the Story behind this numbering system used.Is it only Emb specific.

It's just their numbering system.....it the sequential production run. Every manufacture uses their own system.

EMB120 use 120.?????
EMB135/140/145's use 145.?????
EMB170/175's use 170.??????
EMB190/195's use 190.??????



"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 20, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4184 times:

Quoting RichPhitzwell (Reply 13):
I figured as much, but after posting, still would be fun to see bananas.

I was party to jamming a potato in someone's car exhaust once (he was asking for it  innocent  ). What a disappointment. I don't know how it happened but he started the engine at the second attempt and we found the potato a couple hundred yards down the road.


User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 21, posted (7 years 11 months 2 weeks 1 day 6 hours ago) and read 4181 times:

Quoting HAWK21M (Reply 18):
Whats the Story behind this numbering system used.Is it only Emb specific.

From what I understand after re-reading reply 2, it's Embraer specific, like Boeing and their serial number/line number combos.

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Photo © Josh Akbar
View Large View Medium
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Photo © Radoslaw Idaszak (EPGD Spotters)

From what I can see, it's like the MSN and line number at the same time. As the Embraer 17x and 19x are probably two separate lines, it could mean that in this example, 19000011 is the entire serial number of the particular E-19x, while the last numbers indicate the line number like Boeing (in this case, line number 11), while in the case of the E-175 from the picture I posted, it's MSN 17000134, and line number 134. Please correct me if I'm wrong though.


User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 22, posted (7 years 11 months 1 week 6 days 5 hours ago) and read 3972 times:

Quoting SlamClick (Reply 3):
Looks to me like he is holding a camera. Remember, OSHA has no authority in Brazil.



Quoting Starlionblue (Reply 6):
Obviously an A.nutter.



Quoting L-188 (Reply 9):
Exactly, you film it for the engineers to see what part of the designs they screwed up on.

Ahh, you guys missed the joke. I guess your not big Trekkies.  Smile


User currently offlineFrancoflier From France, joined Oct 2001, 3738 posts, RR: 11
Reply 23, posted (7 years 10 months 3 weeks 1 day 15 hours ago) and read 3593 times:

Quoting L-188 (Reply 9):
Exactly, you film it for the engineers to see what part of the designs they screwed up on.

Well I hope for him they didn't screw up on that part of the design where the aircraft keeps going straight when passing through standing water at high speed...  Silly



Looks like I picked the wrong week to quit posting...
User currently offlineLitz From United States of America, joined Dec 2003, 1754 posts, RR: 0
Reply 24, posted (7 years 10 months 3 weeks 1 day 13 hours ago) and read 3549 times:
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Quoting EMBQA (Reply 17):
Here you can see a picture of 190.0001 with its APU plugged and the APU clearly running and venting out the top.

Umm ... ok ... that picture pretty definately proves there's an APU and it's running ... so ... the $1000 question still remains -

What on earth is there an exhaust BEHIND it for, then, and why is it plugged?

- litz


25 Post contains images 777WT : Ask EMBQA to call an Embraer engineer and find out what's the reason
26 EMBQA : I'll zip an e-mail down to my Engineering friend, but he's also an 'A.nutter' so maybe he'll see it and answer.
27 Post contains images KELPkid : Pity, when someone did it to my car (never did find the jokesters ), I had to keep cranking and cranking and cranking the engine to start...(which is
28 3DPlanes : It certainly looks like there could be a bit missing. But why? And only on one side? An illusion, I think. The sun is coming from the other side, and
29 EMBQA : OK, ... a Stability Control Parachute.
30 Post contains images Litz : Heh .. Mythbusters tested this ... with the same exact result. Except in their case, the flying produce almost beaned one of the testers ... (makes f
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