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Power Loss  
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Posted (13 years 3 months 2 weeks 2 days 8 hours ago) and read 1246 times:

Would it be right to say that after a double engine failure losing both IDGs and and Hyd motor is inop, both EDP's and all ACMP's and ADP's , every single pump and motor in the book,AND the RAT fails to extend you could take power off the BAT's and through static inverters transmit the power to the A/C buses which in turn ables you to start up the APU? 310 engineer I believe spoke to me about this once but I can't quite get it right in my head, so is this correct and if not please change it to make it correct, also I heard that on some a/c the APU has a LI Capacitor which stores current when there a/c has a complete electrical power loss and enables quick APU start up , might be a load of rubbish , dont know
regards
a/c

11 replies: All unread, jump to last
 
User currently offlineMax Power From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 3 months 2 weeks 2 days 5 hours ago) and read 1195 times:

Ac train, get a life! What if the sky falls? would everyone be able to land ok?? Yuck

On this page alone you have made 26 posts. Don't you have any friends to ask something? Ever think of reading a few books? Do you expect everyone to do all the work for you??


User currently offlineF-WWAI From Andorra, joined Dec 1999, 131 posts, RR: 0
Reply 2, posted (13 years 3 months 2 weeks 2 days 3 hours ago) and read 1188 times:

see Paul, the guys believe you should open the books now...


APU's (most of them) have elec starters which necessitate a high current. expect 500 - 700 Amps at 28VDC

now you.
FW


User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 35
Reply 3, posted (13 years 3 months 2 weeks 2 days 2 hours ago) and read 1182 times:

Yes, and you wouldn't even need the static inverter. As F-WWAI wrote just 28VDC.


You're only as good as your last departure.
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 4, posted (13 years 3 months 2 weeks 1 day 21 hours ago) and read 1172 times:

what's wrong with this forum? I believe it was said not so long ago that the forum doesn't have enough input, which is very true, I believe there are to many people on this site who think there above the rest and believe me there are many bullshitters aswell, How about the fact I have god know's how many exams coming up? you guy's are suppost to be people who are not afraid to awnser question's when asked , if you are what the hell are you doing in this forum? I thought people in here were approachable and intelligent people, I was wrong, I forgot in the industry there are quite a few assholes aswell, I feel sorry for you Max Power you must lead a sad sad life to come on here and moan as you do, oh and im 16-20 EVERYONE get's pissed and laid at this age, maybe some of you people need to grow up! this forum need's more input and less moaners, Im sorry but I really do not want to get involved with people like you Max Power and dont awnser my question's, you probarbly couldn't awnser them anyway,
regards
a/c


User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 5, posted (13 years 3 months 2 weeks 1 day 20 hours ago) and read 1170 times:

There are some thing's a book can't tell you, also there's never nothing an aircraft engineer doesn't know and i've got book's and Fcom's and manual's to last a lifetime, I am also, when I get a chance trying to learn as much as I can young ,I was told by a retired a/c engineer he said' you won't get a chance again', you guy's really have let me down in this topic, I have read more book's in this year alone than you'll ever know,
cheers for the nothing input, but this really has made me angry, I dont often get angry but I've never met an a/c engineer who hasn't had enough time to teach me a few thing's . The amount of people I respect in this forum really has gone down,
a/c


User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 6, posted (13 years 3 months 2 weeks 1 day 20 hours ago) and read 1164 times:

FDXmech, F-WWAI no disrespect intended I understand that it might seem I find all I need to know on this site but this is not the case, it's more there is so much to learn! once again I hold no grudge but I didn't like Maxpower's comment's and he's done it a few times in this forum, I feel this forum is becoming less approachable as of the fear of being moaned at when you ask question's, that's a bit stupid and sad don't you think?
regards
a/c


User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 7, posted (13 years 3 months 2 weeks 1 day 15 hours ago) and read 1156 times:

You did all the moaning on this subject. Period.


"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 35
Reply 8, posted (13 years 3 months 2 weeks 1 day 3 hours ago) and read 1143 times:

Hi A/c train,

I hope you didn't miscontrue my "yes" at the beginning of my reply as more than what I meant.

The "yes" was directed as, "yes, you can start the APU using only battery power which is a common practice if the aircraft is parked with no external power available.

Some aircraft that require fuel pressure to start the APU incorporate a DC start pump just for this scenario (no ac power available at the time of APU start to operate the normally AC power driven fuel boost pumps). On aircraft such as the DC10, you switch this pump on manually (called APU START PUMP) while on other it is done automatically (MD11, A300-600 etc).



You're only as good as your last departure.
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 9, posted (13 years 3 months 2 weeks 1 day 1 hour ago) and read 1140 times:

Apologies FDXmech I did fly off a bit, I understand thank's for your replies, much appreciated, as I said ' There are some good one's' I still stand by my comment's though and Im not an angry person, I feel Maxpower was way out of line,
thanks again
a/c


User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 10, posted (13 years 3 months 1 week 6 days 14 hours ago) and read 1133 times:

I must also apologize. After reviewing the posts on on this subject, I realize my first post was rather rude.
A/c train, I must agree that Max's comments were way over powered.  Big grin
But the fact remains, if you're down to the Static Inverter for AC electrical power, and you're not on the ground...

You Are Dead. Sad



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineYaki1 From , joined Dec 1969, posts, RR:
Reply 11, posted (13 years 3 months 1 week 6 days 12 hours ago) and read 1129 times:

Part of ETOPS approval out of the box for the 777 requires using the APU as an alternate electric source. Hence the APU has both electric and Pnuematic starters. The APU starts automatically if power is loss to both the left and right transfer buses while in the air mode.

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