American 767 From United States of America, joined May 1999, 4482 posts, RR: 12 Posted (9 years 1 week 1 day 16 hours ago) and read 3798 times:
I recently read in Airways that El Al is considering converting their PAX 744 into 744F in the long run. When converting a PAX 744 into a 744F, is the upper deck modified to the original size upper deck or is it left as it is and only the seats and galley equipments are removed? I know that a 747-400F fresh out of the factory is built with the upper deck of a 747-100/200 to save weight, but I think that on the other hand a 747-400F that was originally built in PAX version has its upper deck remained as it was. Does that mean there will be 747-400F's in service with strech and non-strech upper decks? It will be the same for the new 747-8.
Starlionblue From Greenland, joined Feb 2004, 17365 posts, RR: 66
Reply 1, posted (9 years 1 week 1 day 14 hours ago) and read 3778 times:
Conversions of long upper deck 747s to freight keep the long upper deck. Also, conversions do not get a nose door.
In theory, this applies not only to 747-300s and 747-400s, but to conversions on 747-200SUD variants as well, but I don't know if any of the SUD conversions have been converted further into freighters.
PhilSquares From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 1 week 1 day 10 hours ago) and read 3737 times:
Quoting American 767 (Thread starter): I know that a 747-400F fresh out of the factory is built with the upper deck of a 747-100/200 to save weight, but I think that on the other hand a 747-400F that was originally built in PAX version has its upper deck remained as it was.
The 744F was built with the 100/200 hump to accomodate more 3 M cargo on the main deck. The 747-300 conversion had a height restriction on the main deck under the footprint of the upper deck area.
The 744BCF have a less restrictive limitation as the upper deck aft of the upper deck escape doors has been modified. The floor is removed allowing 3 M pallets on the main deck.
The empty weight of a 744F is slightly heavier than that of a 744BCF. The difference is because there is no nose door mechanism on the BCF. So, in theory the BCF should have slightly better performance. However, the main deck of the BCF isn't quite as robust as the 744F. There are some "soft" spots where the floor loading isn't quite the same as 744F. So, there is slightly less weight available. In the end, I think the difference in perfomance is minute if at all. One real difference is in the ground handling time. The 744F has a shorter turn time as it has both the side and nose door to facilitate faster unloading/loading.
As PhilSquares mentioned, on the BCF the floor beams aft of the u/d doors are replaced with smaller ones at a higher WL, there are no bins or seats aft of the doors either. The aft galley is removed.
The 4U (forward r/h) lav is replaced and any other lavs present removed.
A small forward galley is installed.
The flightdeck crewrest remains, but the bunk/seat configuration may be modified to meet customer requirements. In most cases the remaining seats are replaced and there are some mods to the overhead and sidewall bins.