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Delta B777 Landing With Hydraulic Problems  
User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Posted (11 years 4 months 6 days 1 hour ago) and read 3944 times:

Hi folks,

Saw a photo on a Delta B777 returning to Frankfurt upon experiencing some hydraulic problems.


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Photo © Christian Ettelt



I assume in this picture it's still braking and slowing down? Noticed that the gear dorrs aren't up probably due to the hydraulic problems but I'm interested to find out why wasn't he landing with flaps 30? That doesn't look like 30 to me, more like 20, (correct me should I be wrong)

Thanks guys, just curious!

alvin


Boeing747 万岁!
8 replies: All unread, jump to last
 
User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 1, posted (11 years 4 months 6 days ago) and read 3906 times:

Hi Alvin, full flap isn't set due to the missed approach gradient requirements, to retract the flap from 30 to 20 via the alternate system impedes the missed approach performance.

User currently offlineJhooper From United States of America, joined Dec 2001, 6206 posts, RR: 12
Reply 2, posted (11 years 4 months 5 days 23 hours ago) and read 3892 times:

Didn't ship 7004 have similar problems the other day?


Last year 1,944 New Yorkers saw something and said something.
User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4491 posts, RR: 21
Reply 3, posted (11 years 4 months 5 days 22 hours ago) and read 3870 times:

Hi Alvin, full flap isn't set due to the missed approach gradient requirements, to retract the flap from 30 to 20 via the alternate system impedes the missed approach performance.

AJ,

If I recall from a few 777 sim rides, it takes the flaps a lot longer to extend/retract with the alternate system, right? I remember watching the flap position indicator move agonizingly slowly...



I got my head checked--by a jumbo jet
User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 4, posted (11 years 4 months 5 days 18 hours ago) and read 3817 times:

Hi JBirdAV8r,

I haven't seen it on the 777, but yes, on the 767 it takes forever, especially from flap 1 to 5. Plan ahead is the key word!
(Cxflyboy??? Out in the typhoon somewhere???)


User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Reply 5, posted (11 years 4 months 4 days 2 hours ago) and read 3650 times:

Thanks guys and sorry for the late reply haven't been able to get online.

Just won dering too, if the hydraulics of the gears fail too and it has to be lowered via the alternate system and gravity force is it possbile to retract the gears back? How about the flaps too? Possible to retract?

Cheers and thanks!



Boeing747 万岁!
User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 6, posted (11 years 4 months 3 days 22 hours ago) and read 3627 times:

Funny you should ask....I was just looking at the schematic of the 777 alternate L/G system today. At first glance it looks like it can only extend. The flaps do not have a connection to the alt. L/G system.

Pete


User currently offlineMxCtrlr From United States of America, joined Nov 2001, 2485 posts, RR: 35
Reply 7, posted (11 years 4 months 3 days 15 hours ago) and read 3579 times:

From the looks of the picture, I would guess a complete "A"-System hydraulic failure (not sure of the designations on the 777, but for an equivalent on the 727). That would require manual extension of the landing gear and alternate extension of the flaps. There is no provision to manually retract the landing gear AFAIK.

MxCtrlr  Smile/happy/getting dizzy
Freight Dogs Anonymous - O.O.T.S.K.  Smokin cool



DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(
User currently offlineCx flyboy From Hong Kong, joined Dec 1999, 6642 posts, RR: 55
Reply 8, posted (11 years 4 months 2 days 11 hours ago) and read 3487 times:

Hi folks,

I was indeed out in the typhoon, but going on holiday and not working. Spent a few days in SIN and BKK stuffing myself with seafood!

"HYD PRESS SYS C" or "HYD PRESS SYS L+R" , or a combination of C and either L or R systems means we have to land with Flaps 20 and Vref30+20 and lower the gear manually. To have L+R both fail would be a very bad day, so I guess that this Delta flight probably lost the Center system. No other single failures in the QRH result in manual gear extension and landing with less than full normal landing flap.


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