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747-400's Without Winglets?  
User currently offlineNAB From , joined Dec 1969, posts, RR:
Posted (13 years 1 month 1 week 1 day 9 hours ago) and read 1256 times:

I hope that one of you experts out there can help me with the answer to this question:

A few years ago i spotted a JAL 747-400 (D) (or so it said on the fuselage). However it was not fidded with any winglets. Can anyone give me a reasonable explanation. I thought that all -400's had winglets? But apparently it is not so.
If it can be at any help the reg. was JA8963, and it was delivered to JAL on 31 of August 1993.

-thanks, NAB

6 replies: All unread, jump to last
 
User currently offlineTripleseven From United States of America, joined Jul 2000, 118 posts, RR: 0
Reply 1, posted (13 years 1 month 1 week 1 day 9 hours ago) and read 1218 times:

I once thought the same thing, however as I understand it, on shorter domestic routes in which a 747-400 is used, the cost of winglets is more than the savings they'd produce.

Boeing.com has info on the 747-400 domestic.

http://www.boeing.com/commercial/747family/index.html


User currently offlineAa737 From United States of America, joined Oct 1999, 849 posts, RR: 0
Reply 2, posted (13 years 1 month 1 week 1 day 7 hours ago) and read 1195 times:

From my understanding the 744 winglets are designed to give better results on long range trips. On the short Japanese domestic flights the winglets don't offer any advantages and are removed to save weight.

User currently offlineAeroGlobeAir7 From United States of America, joined Jan 2001, 586 posts, RR: 2
Reply 3, posted (13 years 1 month 1 week 1 day 7 hours ago) and read 1190 times:

The B 747-400 you speak of is a Boeing 747-400D (Domestic). JAL and ANA utilize these aircraft on high density, short range routes within Japan. 744Ds have a max. range of a little over 1,000 miles. The interiors are basically like a tube train's, seating no less than 500 passengers.

User currently offlineA40-TY From United Arab Emirates, joined Apr 2000, 143 posts, RR: 0
Reply 4, posted (13 years 1 month 1 week 12 hours ago) and read 1158 times:

Yes, you did indeed see a 747-400, as you say it is known as 'Domestic' and is an upgraded version of the earlier 747SR (Short Range) model, used specifically on Japanese domestic services.

The winglet feature that is present on normal 747-400 models is designed as a performance enhancing feature to improve the aircraft's range and fuel consumption, as well as a number of other factors. These requirements are therefore mandatory for an aircraft operating on services of anything up to 13,000km.

The 747-400D model does not require the winglet feature as the routes that it serves are within a distance of 1000 - 3000km.

As a 747D (or SR) begins to age, it is entirely possible for the manufacturer to retrofit winglets, etc to the aircraft so that it can operate on long haul routes, of which the airframe had not previously been exposed to, therefore prolonging the aircraft's life. The aircraft would then be redesignated as a standard 747-400 or 747-200 or 300.



I love it when a plan comes together
User currently offlineDash8tech From United States of America, joined Jul 1999, 732 posts, RR: 5
Reply 5, posted (13 years 1 month 6 days 21 hours ago) and read 1138 times:

It is also possible one may have been damaged and to CDL them you need to remove both???

Cheers.


User currently offlineNab From , joined Dec 1969, posts, RR:
Reply 6, posted (13 years 1 month 6 days 15 hours ago) and read 1131 times:

THANKS TO ALL OF YOU FOR YOUR RE'S!

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