NAB From , joined Dec 1969, posts, RR: Posted (14 years 11 months 1 week 3 days 14 hours ago) and read 2125 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.
Aa737 From United States of America, joined Oct 1999, 849 posts, RR: 0
Reply 2, posted (14 years 11 months 1 week 3 days 12 hours ago) and read 2064 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.
AeroGlobeAir7 From United States of America, joined Jan 2001, 586 posts, RR: 2
Reply 3, posted (14 years 11 months 1 week 3 days 12 hours ago) and read 2059 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.
A40-TY From United Arab Emirates, joined Apr 2000, 143 posts, RR: 0
Reply 4, posted (14 years 11 months 1 week 2 days 17 hours ago) and read 2027 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.