Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
B752 APU Gen U/s  
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Posted (8 years 2 months 1 week 4 days 12 hours ago) and read 1845 times:

On a B752 If the APU Generator is u/s.
Can the APU be run with the Generator Installed.
Or does the APU gen have to be removed to avoid damage to the rotating Gen & blanked to enable the Gen Scavenge pump to function.
Anyone done it practically.
regds
MEL


Think of the brighter side!
7 replies: All unread, jump to last
 
User currently offlineDl757md From United States of America, joined May 2004, 1562 posts, RR: 16
Reply 1, posted (8 years 2 months 1 week 4 days 10 hours ago) and read 1832 times:

The MEL says nothing about removing the APU gen when it is INOP. So I'd have to say you can fly with it.

DL757Md



757 Most beautiful airliner in the sky!
User currently offlineBuzz From United States of America, joined Nov 1999, 697 posts, RR: 22
Reply 2, posted (8 years 2 months 1 week 4 days 10 hours ago) and read 1827 times:

Hi Hawk21M, Buzz here. No problems with running the APU if the generator has gone bad, as long as it keeps oil inside. It's an oil cooled generator.
Sometimes we get 757's where the APU pneumatics have failed, or generator has failed. SO we use what it'll supply, if there's no physical damage: if it'll supply air... then we don't need the Huffer for an engine start. If the pneumatics have failed, but the electricity is good - that's one less thing to trip over at departure time.
Tonight we had an Airbus through-trip, APU was dead and it would not accept external power. The advice we were given was to trip the generator on the left engine (which was running to supply power) and re-boot the GPCU circuit breakers. After a minute the airplane recognized that external power ws plugged in and life was back to normal.
g'nite


User currently offlineFr8mech From United States of America, joined Sep 2005, 5355 posts, RR: 14
Reply 3, posted (8 years 2 months 1 week 4 days 9 hours ago) and read 1822 times:

Hey Buzz,

We've had the same problem on our 'Buses. Except everytime I've seen it, we were trying to power from a dead airplane. Batteries on, generator switches off, GPU on, 1 generator switch at a time, repeat as required while throwing choice words at the Eurotrash.



When seconds count...the police are minutes away.
User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 2 months 1 week 4 days 6 hours ago) and read 1802 times:

MEL 24-2 states as long as it's not going on an ETOPS flight longer than 120 minutes the APU gen can be inop.

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 5, posted (8 years 2 months 1 week 2 days 12 hours ago) and read 1714 times:

Quoting Buzz (Reply 2):
No problems with running the APU if the generator has gone bad, as long as it keeps oil inside. It's an oil cooled generator.

What in case The Gen Scavenge filter is clogged leading to Shutdown.Any solution for at Outstation base apart from CF.
regds
MEL



Think of the brighter side!
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5355 posts, RR: 14
Reply 6, posted (8 years 2 months 1 week 2 days 8 hours ago) and read 1701 times:

Quoting HAWK21M (Reply 5):
Any solution for at Outstation base apart from CF.

Not sure what 'CF' is, but if your APU is shutting down, you defer it and move along.



When seconds count...the police are minutes away.
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 7, posted (8 years 2 months 1 week 1 day 17 hours ago) and read 1667 times:

Quoting Fr8Mech (Reply 6):
Not sure what 'CF' is

CF or c/f = carried forward [Deffered].
At a Transit Stn if APU pneumatics are Available & B752 at High temp would else need Min Two Ideal Three Ground connections for start [RB211 Engines].
If APU can be run without deffering under MEL would be beneficial by not using Electricals.
But can a damaged Generator be destroyed if it is permitted to rotate.
regds
MEL



Think of the brighter side!
Top Of Page
Forum Index

Reply To This Topic B752 APU Gen U/s
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...
MD80...APU/Gen... posted Mon Sep 6 2004 07:37:04 by Nudelhirsch
"useless" Gen Av Fuel Gauges posted Mon Sep 18 2006 11:41:02 by Speedracer1407
APU Looks Plugged On This Test Airplane posted Sat Aug 19 2006 14:17:49 by CURLYHEADBOY
B752 - Aft Break Ring. posted Fri Aug 18 2006 13:28:17 by HAWK21M
B752 Power Assist Cylinder posted Mon Aug 14 2006 09:47:13 by HAWK21M
CRJ-200 APU's posted Wed Aug 9 2006 06:18:05 by MesaMXORD
737: GEN Fail With Flat Battery Problem posted Sat Aug 5 2006 07:14:40 by Mandala499
B752 Freighters Cargo Fire Extinguishing System posted Fri Jul 28 2006 12:21:21 by HAWK21M
Explanation Of ETOP(s) Changes To A B752 posted Thu Jul 13 2006 01:49:15 by ASTROJET707
B752 Pneumatic Ground Start Using GSE. posted Thu Jun 15 2006 14:16:22 by HAWK21M

Sponsor Message:
Printer friendly format