targowski
Posts: 123
Joined: Sun Aug 31, 2003 9:57 am

777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 3:03 am

i've heard that due to the altitude and position of the himilayas, twins have more difficulty or have to reroute around the himilayas to meet ETOPS. i'm wondering if (1) this is true and (2) how this affects AA's ORD-DEL and CO's EWR-DEL since both use 777s. I know the short lived AC YYZ-DEL used A340s.
 
sunrisevalley
Posts: 5065
Joined: Tue Jul 06, 2004 3:26 am

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 5:15 am

Do a search of the archives for a Pakistan Airlines thread that literally flogged this particular issue to death.
Not sure why you would think it is ETOPS related in so far as proximity to the Himalaya's are concerned. ETOPS is primarily an over water issue.
 
flyinghippo
Posts: 690
Joined: Thu Aug 11, 2005 12:48 am

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 5:19 am

Can you kindly provide the link to the thread? Thanks
 
avconsultant
Posts: 709
Joined: Sun Feb 26, 2006 1:18 am

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 5:54 am

It's an issue with twin engine aircraft losing an engine with the drift down procedure. I believe PanAm had concerns with this route in using the A310's.

It is not to be confused with ETOPS.
 
blrsea
Posts: 1443
Joined: Fri May 20, 2005 2:22 am

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 6:10 am

There were lots of threads on this. The flight path doesnt go over the himalayas. It goes over central asia ->Afghanistan-> pakistan ->India. It doesn't have to go over himalayas
 
COEWR787
Posts: 304
Joined: Fri Mar 11, 2005 12:35 pm

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 6:27 am

Quoting Blrsea (Reply 4):
There were lots of threads on this. The flight path doesnt go over the himalayas. It goes over central asia ->Afghanistan-> pakistan ->India. It doesn't have to go over himalayas

Correct. The flight path usually crosses the Hindu Kush over Afghanistan, and that has never been a problem for any plane.

As for Himalayas, there are restrictions on flying across Tibet in general, irrespective of how many engines you have, because in case of cabin depressurization it is impossible to bring the plane down to 7000' without going a few thousand feet underground . The plateau is about 11 to 12 thousand feet average altitude. This is obeyed quite carefully. For example, last time I flew SQ from EWR to SIN we flew an almost straight route across the pole, except for a divergence to the left to avoid a corner of the Tibetan plateau.

BTW, flight that originate or terminate in Tibet of course fly over Tibet. As a matter of fact when I flew from Lhasa to Kathmandu the aircraft was a twin (757) which flew right over Mount Everest. Can't get any higher than that, and yet it was a twin.

[Edited 2006-06-28 23:30:29]
 
EI787
Posts: 1230
Joined: Wed Feb 01, 2006 4:06 am

RE: 777s To DEL From ORD/EWR And Himilayas

Thu Jun 29, 2006 6:32 am

Here's another thread about twins over the Himalayas:
RE: Twins Over The Himalayas? (by TGV Jan 26 2005 in Civil Aviation)#ID1924514

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