El Al 001 From Israel, joined Oct 1999, 1063 posts, RR: 2 Posted (12 years 9 months 2 days 14 hours ago) and read 2007 times:
It really surprised me to see that after so many 744s powered by RB211-524 that were ordered by Qantas, the airline turned into the CF6-80C2B1F engine for its new 747-400ER.
I know that QF already operates some 744s with CF6 engines (2-3 ex-MAS) but those were not ordered originally by Qantas.
Why would an airline order the same a/c with a different engine???? (I know BA's 777s case, why is this???)
El Al 001 From Israel, joined Oct 1999, 1063 posts, RR: 2
Reply 1, posted (12 years 9 months 2 days 14 hours ago) and read 1968 times:
Forgot to mention that also QF's 742s, 74SPs and 743s are powered by RB211-524 engines, which leads me to another question; I know that UA and also El Al operated/s a few of ex-QF 742s which were powered by JT9D engines, How come??!
Aamd11 From UK - Wales, joined Nov 2001, 1059 posts, RR: 1
Reply 4, posted (12 years 9 months 2 days 12 hours ago) and read 1931 times:
I have no idea why they would do that, its unbelievable.
They have 767s powered by
Pratt and Whitney
Rolls Royce (ex BA)
Thay have also operated 747s will all of the above engines.
So why the madness?? a fleet of little more that 40 767s with 3different engine types.
I know QF ordered 747s with JT9s because the Rollers were not ready, and once they were the JT9s left a lot earlier, quite some time ago.
Maddness isnt it? I bet the fleet maintanence is a oain in the ass, all of those differnt engines!!!!!
Syd717 From Australia, joined Oct 2001, 18 posts, RR: 0
Reply 5, posted (12 years 9 months 2 days 11 hours ago) and read 1916 times:
From what I understand, the GE powered 744s inherited from MH and OZ had the same engines as the GE powered 767s in QF's fleet.
SailorOrion was right in that the 3 spool RR engines tended to be very maintenence intensive. Also they are not very good for short haul ops. CX learned this the hard way with more frequent engine failures after they started using their 744s regularly on short hauls, eg. HKG-TPE. The Ex BA RR powered 767s apparently are hopeless as short haul aircraft too, due to the 3 stage compressors being a maintenence nightmare.
As the QF 744s were increasingly used for short hauls it became clear to QF that the 2 spool GE engines were far more cost effective. The ex MH/OZ aircraft also proved their worth on the long haul SYD/MEL-LAX routes. The GE aircraft were able to have greater Range/Payload than the RR powered 744s, hence QF tries to use these aircraft for the pacific routes whenever possible.
As far as the 742s are concerned, I belive that the RR was not available at the time that QF got their first batch during the early 70s.
Incicentally NZ also operate their 744s with both engine types.