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Modifying B747-400's  
User currently offlineKL808 From United States of America, joined May 1999, 1596 posts, RR: 2
Posted (11 years 2 months 3 weeks 5 days 13 hours ago) and read 3497 times:

CX has just bought used B747-412's from SQ. Some of these birds will be converted to Freighters.

My question is, since CX had difficulty finding RR powered dash 400's what would it take to change the PW powered SQ birds to RR powered?

Also the upper deck are usually left untouched, why?

Does this not increase weight as well as reduce cargo capacity because of the height difference of the hump?

Also having the upper deck stay the same do you have an increase in aerodynamic efficiency compared to the shorter deck?


4 replies: All unread, jump to last
User currently offlineTod From Denmark, joined Aug 2004, 1767 posts, RR: 3
Reply 1, posted (11 years 2 months 3 weeks 5 days 12 hours ago) and read 3431 times:

Three of the ex-SQ planes will be converted to match currect CX pax configuration. 9V-SMN will be the first, with the mod in Xiamen starting soon. 9V-SMK and 9V-SML to follow.

The freighter conversion will also take place at TAECO in Xiamen, but it will be one of the existing CX fleet, B-HOU. The upper deck will remain intact forward of the upper deck doors, but after of the doors the interior will be stripped and the upper deck floor beams replaced.

User currently offlineAirxLiban From Lebanon, joined Oct 2003, 4536 posts, RR: 52
Reply 2, posted (11 years 2 months 3 weeks 5 days 6 hours ago) and read 3336 times:

OK no re-engining right?

User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 3, posted (11 years 2 months 3 weeks 5 days 6 hours ago) and read 3342 times:

The SF mod on the 400 does several things. As stated above, the upper deck is modified aft of the upper deck doors. The floor is removed, thus allowing taller cargo to be loaded aft of the upper deck doors, on the main deck. The cargo handling system is installed on the main deck and the side door is also added. There are other things done, but that's the highlights.

The floor is strengthened in several areas on the main deck, although there are still some weight restricted positions (when compared to the 744F).

The 4056 engines are left and not changed to RR. This mod would be very expensive as it has not been done before and would have to be certified by the FAA/JAA and other agencies.

The empty weight of the aircraft is generally lighter than a 744F, since there is no nose door and all of the associated equipment for that. The average weight of a 744F is about 159.6 Tonnes and the SF should be at 157.5 or so.

The stretched upper deck is actually more fuel efficient than the shorter upper deck. The result is the 744F is .85 and the 744(SF) is .86. Not much difference.

User currently offlineKL808 From United States of America, joined May 1999, 1596 posts, RR: 2
Reply 4, posted (11 years 2 months 3 weeks 4 days 16 hours ago) and read 3257 times:

Thanks Philsquares.

But if the stretched upper deck is more efficient, then why not build B747-400F/ERF with them?

With regards to the engines transferring from PW to RR's are the pylons on the 3 different engine variants different? Is that what needs to be modified? Are there electronic mods needed too?


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