Aviationfreak From Netherlands, joined Nov 2003, 1166 posts, RR: 39 Posted (8 years 10 months 3 weeks 2 days ago) and read 4332 times:
For a while now I know that NZ for example have their 744 fleet equiped with 2 different types of engines. I believe 4 of them have RR engines and I'm not sure about the engine type of the other 4. The only thing I do know is that the other 4 are equiped with the same engines as their 763 fleet is. I do know half their 744 fleet is leased. Are these the 744's with RR engines? So maybe they've never done maintenance on these ones themselfs but was it all part of the lease deal.
Anyways. Personaly I don't think this is efficient maintenance wise.
But I also noticed EK has a fleet of 773's with both the RR trends and GE90's. Also I thought QF their 744 fleet had all RR engines but recently I saw a QF 744 with a different engine type.
There must be a good reason because I don't think airlines these days like to waste money on maintenance. Has it anything to do with the fact some airlines need the capacity quick and can't wait for a certain a/c type with a certain engine type being delivered?
Can anyone enlighten me on this?
Thanks in advance and kind regards.
I love both Airbus and Boeing as much as I love aviation!
AirbusA6 From United Kingdom, joined Apr 2005, 2047 posts, RR: 0
Reply 1, posted (8 years 10 months 3 weeks 2 days ago) and read 4324 times:
The QF 747ERs are GE powered, but then the RB211 wasn't certified on this variant. It could be considered illogical that QF operated GE 767s and RR 747s, but maybe they prefer to keep the manufacturers keen - they ordered GE A330s and RR A380s!
The EK 773A models are RR, but the 773ER models are exclusively GE. Similarly CX operate RR 773A models and have ordered the GE 773ER as well.
I believe the other NZ 744s are GE powered
it's the bus to stansted (now renamed national express a4 to ruin my username)
777ER From New Zealand, joined Dec 2003, 12472 posts, RR: 17
Reply 4, posted (8 years 10 months 3 weeks 1 day 22 hours ago) and read 4281 times:
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Quoting Aviationfreak (Thread starter): For a while now I know that NZ for example have their 744 fleet equiped with 2 different types of engines. I believe 4 of them have RR engines and I'm not sure about the engine type of the other 4
Jetjack74 From United States of America, joined Jul 2003, 7443 posts, RR: 50
Reply 7, posted (8 years 10 months 3 weeks 1 day 22 hours ago) and read 4248 times:
BA operated 747-200's with both PW and RR engines. During the merger period with BCAL, they also operated a handful of GE powered 747's but were disposed of shortly after due to serious commonality issues.
Right that was it. There were a few combi's that were operated by BA but spent quite a few years leased out. These 2 were leased on and off to MEA, but were owned and operated by BA on and off
FlagshipAZ From United States of America, joined Jan 2001, 3419 posts, RR: 14
Reply 10, posted (8 years 10 months 3 weeks 1 day 16 hours ago) and read 4125 times:
Don't forget UPS. Their 757 fleet is nearly divided in half with one half powered by PWs & the other half powered by RRs.
American inherited 27 757s from TWA with PWs. They are being phased out now once their individual leases are up. The PWs 767s were never really merged into AA's fleet. They were simply parked. Regards.
"Beer is living proof that God loves us and wants us to be happy." --Ben Franklin
FlyDreamliner From United States of America, joined Jan 2006, 2759 posts, RR: 15
Reply 15, posted (8 years 10 months 3 weeks 1 day 14 hours ago) and read 4005 times:
Quoting Jetjack74 (Reply 5): Here at NWA, we had our 21 original PW-powered DC10-40's, augmented by 24 GE-powered DC10-30's
Arguably, NW is one of P and W's best and most loyal customers, in fact, they are the only opperator of PW powered 757-300s. Douglas only ever offered the longer range DC-10-30 with the GE CF6, so they were stuck in it. They were already comitted to the DC-10, so they just had to deal with it.
Ironically however, While nearly the whole NW fleet is PW, their every growing A319/A320 fleet is CFM powered, rather than IAE (which is 50% PW).
Quoting Bomber996 (Reply 11): The New US has a fleet of A320's and A319's that have different engines. The old US ones have CFM, and the old HP's have IAE.
I wonder what they'll do about the IAE powered A320/A319s. They still fly a lot of CFM powered 737s as well.
"Let the world change you, and you can change the world"
Stitch From United States of America, joined Jul 2005, 31815 posts, RR: 85
Reply 16, posted (8 years 10 months 3 weeks 1 day 14 hours ago) and read 3999 times:
Quoting Aviationfreak (Thread starter): Anyways. Personaly I don't think this is efficient maintenance wise...There must be a good reason because I don't think airlines these days like to waste money on maintenance. Has it anything to do with the fact some airlines need the capacity quick and can't wait for a certain a/c type with a certain engine type being delivered?
It's probably a combination of many factors:
For leased or pre-owned aircraft, you may have to take the engine that is hanging on the wings.
Certain models come with exclusive powerplants (GE on the 773ER/772LR and RR on the A345/A346).
"Power by the hour" or other service contracts that greatly reduces the up-front costs of operating a new engine type (such as spares and cross-training).
Performance - a newer engine family might give better range or economics then older ones in use on older planes.
HA_DC9 From United States of America, joined Jul 1999, 659 posts, RR: 1
Reply 17, posted (8 years 10 months 3 weeks 1 day 13 hours ago) and read 3969 times:
Quoting Aviationfreak (Thread starter): Has it anything to do with the fact some airlines need the capacity quick and can't wait for a certain a/c type with a certain engine type being delivered?
That sounds like what HA did recently. Their 763ER fleet are powered by P&W, but the 4 recently purchased ex-DL 763s are GE powered. I believe they were having trouble finding P&W 763s and at favorable terms. The GE 763s will allow HA to expand existing routes or create new ones from the west coast to Hawaii to remain competitive as well as allowing the airline to shift some of the P&W 763ERs to current (and future) longer ranged routes. IIRC, the CEO admitted in a letter to employees discussed on this board a while back that "beggars can't be choosey" or something to the like.
Gemuser From Australia, joined Nov 2003, 5911 posts, RR: 6
Reply 18, posted (8 years 10 months 3 weeks 1 day 7 hours ago) and read 3861 times:
The sitution with QF is relatively simple, if you look at it over time. All B747-438 have RR engines. When they introduced the B767-338s they chose GE engines for what ever reason, maybe the RR wre not offered at the time or cost to much or whatever.
Move forward in time a decade and half or so and QF is looking for more lift. They aquire 3 B744 from MH & OZ, which have GE engines as they were the best they could find, BUT the GE engines on the 744 are the same type as on the 763 (differnt dash numbers) so its not a new engine type for the airline.
A bit further on and they need more medium haul lift and they lease 7 B767-336s from BA which have RR engines, but again the same basic type as QFs B744s so again its not a new engine type.
Moving on again an QF finally persude Boeing to build them some B747-438ERs, which are only offered with GE engines. Again the same basic type as they already have on 767s and 744s so again its not a new engine type.
While it is good to have only one engine type, sometimes it just does not work out, especially over the long run.
Jetjack74 From United States of America, joined Jul 2003, 7443 posts, RR: 50
Reply 20, posted (8 years 10 months 3 weeks 14 hours ago) and read 3725 times:
Quoting FlyDreamliner (Reply 15): Ironically however, While nearly the whole NW fleet is PW, their every growing A319/A320 fleet is CFM powered, rather than IAE (which is 50% PW).
Because at the time when the A320 was offered to us as the US launch customer, the CFM56 engines were the only ones available. The V25000 were still a year away and not yet certified. They were also cheaper, and not worth the wait. So we went the GE's.
It's important to distinguish between such cases. In the first, NZ has different engines on the same model of aeroplane. In the second EK is flying two very different versions of the 777-300.
There are various reasons why airlines have more than one engine option on what is, or may appear to be, the same model of plane.
1. Changing horses in mid-stream. In some ways, this is the most interesting. An airline buys x copies of a model with AA engines but a few years later orders another batch of the same model with the competing BB engines. The reasons for the change will vary from customer to customer.
EXAMPLES: *UPS put PW2000s on the first half of their 757-200APF fleet but RB211-535s on the second half. *NZ (above) initially ordered RB211-524s for their 747-400s but then switched to CF6s. *Cargolux chose CF6s for their 747-400Fs but then switched to RB211-524s.
2. Changing horses because that's what is available. An airline has a fleet of planes with AA engines. They want a couple more. New builds will cost a lot and take time to deliver but there are used (or built but not delivered) planes available much sooner. However, they have BB engines.
EXAMPLES: *SAA had 6 747-400s with RR and wanted two more. Boeing had two 747-400s built (I think for Philippines?) but never delivered - but they had GE engines. SAA took them nonetheless. This wasn't a conscious decision to switch engines but simply a trade-off between availabilty, cost and commonality. *QF also have three GE-powered 747-400s in their otherwise RR-powered 747-400 fleet. Three used planes (one ex-Asiana and two ex-Malaysia) became available and they took them.
3. Different engines on different sub-types. An airline flies a fleet of XXX-200s with AA engines. They then add XXX-300s or -200ERs or -200IGWs or whatever and switch to BB engines. These may superficially appear to be the "same" model but they are not.
EXAMPLES: *JAL put PW4000s on their 777-200s. When they came to order 777-200ERs, however, they chose GE. *QF's 747-400s (with the exception of the three mentioned above) have RR but they ordered GE for their 747-400ERs.
4. Models where there is no choice of engines. An airline flies a fleet of XXX-200s with AA engines. The manufacturer then brings out a bigger/better version but it is only available with BB engines.
EXAMPLES: *The obvious example is the 777-300ER which is only available with GE. *EK have 777-300s with RR and 777-300ERs with GE. *So do Cathay Pacific. *ANA have 777-300s with PW and 777-300ERs with GE. *So do JAL.
5. Fleets inherited through takeovers. An airline has AA engines on its fleet of XXX but then takes over another airline which also flies the XXX but uses BB engines.
EXAMPLES: *AA has RR on its 757-200s. When it took over TWA it inherited TWA's fleet of PW-powered airlines and so now flies both. *Air Canada had PW on its 767s and 747s but when it took over Canadian it inherited GE-powered fleets of the same types. *The merger of America West and US Airways gives the new airline a mixed fleet of A320s with both CFM and IAE.
6. Corruption? Stupidity? Being stoned at the time? Some decisions are hard to explain!
EXAMPLE: Thai ordered eight (later more) A330-300s - four with GE and four with PW... The GE frames were to be delivered first (all in 1993) and the PW frames a year later. The CF6 was available somewhat earlier on the A330 but did it realy make sense to have a mixed fleet rather than wait a few months for PW? Or why not order all eight with GE? Anyway, common sense eventually prevailed and they were all built and delivered with the same engine (PW).
No doubt there are other reasons why airlines end up with mixed engine fleets but these are six (OK, five) reasonably common ones.
Carpethead From Japan, joined Aug 2004, 3005 posts, RR: 3
Reply 23, posted (8 years 10 months 2 weeks 6 days ago) and read 3610 times:
Quoting PM (Reply 22): Thai ordered eight (later more) A330-300s - four with GE and four with PW...
Actually, all the A333s are PW powered with three different gross weight versions (engines probably too). Their A300s are GE & PW powered.
TG has the most mismatched fleet-engine types.
743/744s - GE.
772/773s - RR. (Lets what powerplant they put on the new 772ERs)
MD-11s - GE
A345/A346 - RR (duh)
A333 - PW
AB6 - GE/PW.
A388 - RR?
At least they are moving away from PW, as no new build A333s for the last few years.
They haven't yet chosen an engine for their A380s but it would seem like RR is the more likely choice. (Yes, TG has been pretty eccentric in the past but their more recent orders have maintained much more logic.)
: The -202s are GE and the -223s are PW. If I'm not mistaken, the PW757s from 5X are all operating in Europe, while the RB211 powered 757s fly all over
: Thats actually 3x RR and 5x GE. ZK-NBS, NBT and NBU are RR all owned and NBV also owned is GE, the rest NBW, SUH, SUI and SUJ are leased and GE power
: There was no other engine option for the 732. Only PW on those. Yes, but unlike UA and their 772A/772ER fleet, SQ ordered their 772ERs with Trents, a
: Ah ok thanks for that. Thanks again! Sounds good.