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777s To DEL From ORD/EWR And Himilayas  
User currently offlineTargowski From United States of America, joined Aug 2003, 127 posts, RR: 0
Posted (8 years 2 months 3 weeks 15 hours ago) and read 4104 times:

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.

6 replies: All unread, jump to last
 
User currently offlineSunriseValley From Canada, joined Jul 2004, 4982 posts, RR: 5
Reply 1, posted (8 years 2 months 3 weeks 13 hours ago) and read 3960 times:

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.


User currently offlineFlyingHippo From United States of America, joined Aug 2005, 684 posts, RR: 1
Reply 2, posted (8 years 2 months 3 weeks 13 hours ago) and read 3952 times:

Can you kindly provide the link to the thread? Thanks

User currently offlineAvConsultant From United States of America, joined Feb 2006, 1360 posts, RR: 3
Reply 3, posted (8 years 2 months 3 weeks 12 hours ago) and read 3860 times:

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.


User currently offlineBlrsea From India, joined May 2005, 1423 posts, RR: 3
Reply 4, posted (8 years 2 months 3 weeks 12 hours ago) and read 3832 times:

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

User currently offlineCOEWR787 From United States of America, joined Mar 2005, 337 posts, RR: 3
Reply 5, posted (8 years 2 months 3 weeks 11 hours ago) and read 3777 times:

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]

User currently onlineEI787 From Ireland, joined Jan 2006, 1513 posts, RR: 20
Reply 6, posted (8 years 2 months 3 weeks 11 hours ago) and read 3760 times:
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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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