Mr.BA
Topic Author
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Delta B777 Landing With Hydraulic Problems

Tue Aug 26, 2003 8:41 am

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!
 
AJ
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Joined: Wed Nov 03, 1999 3:54 pm

RE: Delta B777 Landing With Hydraulic Problems

Tue Aug 26, 2003 10:00 am

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.
 
jhooper
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RE: Delta B777 Landing With Hydraulic Problems

Tue Aug 26, 2003 10:29 am

Didn't ship 7004 have similar problems the other day?
Last year 1,944 New Yorkers saw something and said something.
 
JBirdAV8r
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RE: Delta B777 Landing With Hydraulic Problems

Tue Aug 26, 2003 11:21 am

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
 
AJ
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RE: Delta B777 Landing With Hydraulic Problems

Tue Aug 26, 2003 3:33 pm

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???)
 
Mr.BA
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RE: Delta B777 Landing With Hydraulic Problems

Thu Aug 28, 2003 8:12 am

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!
 
delta-flyer
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RE: Delta B777 Landing With Hydraulic Problems

Thu Aug 28, 2003 11:19 am

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
"In God we trust, everyone else bring data"
 
MxCtrlr
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RE: Delta B777 Landing With Hydraulic Problems

Thu Aug 28, 2003 6:44 pm

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
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CX Flyboy
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RE: Delta B777 Landing With Hydraulic Problems

Fri Aug 29, 2003 10:24 pm

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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