Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
B767 Etops Question  
User currently offlinedivemaster08 From Cayman Islands, joined Jul 2008, 342 posts, RR: 0
Posted (1 year 3 months 2 weeks 3 days 22 hours ago) and read 3959 times:

Was reading this article on a Delta 767 that diverted due to a generator failing and it states the reason it had to was cause another generator failed on departure from BRU.

http://avherald.com/h?article=467e09e8&opt=0

Now not an expert but I would of thought that in this event, with a generator failing, your already onto your backup before you entered ETOPS airspace so wouldnt that require you to not even enter the ETOPs airspace and return to fix the problem?

Obviously I am only aware of 3 Gens on the 767 (engines and apu). Do the engines actually have 2 gens per engine which are automatically swapped out in the event of the prime gen failing?


My dream, is to fly, over the rainbow, so high!
3 replies: All unread, jump to last
 
User currently offlineMax Q From United States of America, joined May 2001, 4780 posts, RR: 19
Reply 1, posted (1 year 3 months 2 weeks 3 days 21 hours ago) and read 3929 times:

Quoting divemaster08 (Thread starter):


Now not an expert but I would of thought that in this event, with a generator failing, your already onto your backup before you entered ETOPS airspace so wouldnt that require you to not even enter the ETOPs airspace and return to fix the problem?

No, for example you can dispatch on an ETOPS flight with a generator inop (although you may be restricted to a shorter time, e.g. 120 minutes)


So losing one is not that serious and you can certainly continue into ETOPS
Remember you have the APU generator as a back up that can power the entire electrical system if necessary.


Losing a second one, however is not good, you are now down to one with your only electrical redundancy on the 767 being the Hydraulic Motor Generator then the battery.


The HMG is really a last ditch back up that only powers select items and the battery even more so, also it only lasts for 30 minutes if you're lucky.


There are a total of three generators on the B767, one on each engine and one on the APU.



The best contribution to safety is a competent Pilot.
User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4229 posts, RR: 37
Reply 2, posted (1 year 3 months 2 weeks 3 days 20 hours ago) and read 3903 times:

Quoting Max Q (Reply 1):
the battery even more so, also it only lasts for 30 minutes if you're lucky.

Reminds me of that AA 757 about 6 years back that had some failure that put them on the battery. For whatever reason, they flew around for around an hour on battery only, and damaged the airplane on the landing. They were lucky it didn't end up much worse!



Chicks dig winglets.
User currently offlineroseflyer From United States of America, joined Feb 2004, 9817 posts, RR: 52
Reply 3, posted (1 year 3 months 2 weeks 3 days 7 hours ago) and read 3737 times:

The requirements for dispatch are different than the requirements for what would cause a diversion. For Non-ETOPS operations, one IDG may be inoperative if the APU is working and is powered up the entire flight. For 120 ETOPS operations, both IDGs must work. However loss of one IDG does not cause a diversion. 120 ETOPS may not be dispatched with an inperative generator, but once the airplane is in the air, the requirements change.

For a 767, if an IDG fails in flight, the procedure is to start the APU. If the APU starts, then it is ok to continue flight. If the APU fails, then the airplane is required to divert to the nearest suitable alternate. The diversion requirement is if the airplane has only one AC power source remaining. As stated earlier, there is still the hydraulic generator available as an emergency source of power.



If you have never designed an airplane part before, let the real designers do the work!
Top Of Page
Forum Index

Reply To This Topic B767 Etops Question
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
B737NG Etops Question posted Sat Feb 25 2012 20:29:01 by divemaster08
B6 - A320 - ETOPS question posted Fri Nov 25 2011 14:11:18 by jbcontrails
Etops Question posted Wed Jan 3 2007 11:26:36 by AirWillie6475
North Atlantic Etops Question posted Tue May 11 2004 08:08:51 by Hardkor
B767 Main Gear Question posted Tue Jul 20 2010 21:05:15 by cyxuk
B767-200 Fuel Consumption Question posted Sun Nov 12 2006 07:06:31 by Jetline
B767 Cargo Hold Question posted Mon Oct 23 2006 09:34:54 by Don
A330 & B767 Engine Component Question? posted Wed Oct 1 2003 01:34:29 by Mr Spaceman
UA B767-322ER Powerplant Question posted Thu Nov 1 2001 21:59:59 by WarriorII
Question On JetBlue A320 posted Mon Aug 19 2013 10:00:39 by Soxfan

Sponsor Message:
Printer friendly format