N1120a From United States of America, joined Dec 2003, 27271 posts, RR: 74
Reply 1, posted (10 years 4 months 2 weeks 3 days 19 hours ago) and read 1730 times:
>When an Airliner purchases their aircraft is there an option list as to type, and/or size, of the engines fitted?<
They order the engines and airplane in seperate contracts. They then tell Boeing or Airbus what engine, with what settings they are getting and the proper software is installed. The engine manufacturer will send the engines to B or A and they will put them on
>For example, why would an airline, when purchasing a 777 want GE over RR engines. Are there reliability, fuel consumption, thrust or service contracts that favor one over another.<
All kinds of reasons. CO, for example, was helped out of bankruptcy by GE and now always orders GE engines if they are an option. BA, who politically will order RR is possible, have some GE powered 777s because of a contract where they sold a MX plant. UA and NW have always leaned to PW.
Mangeons les French fries, mais surtout pratiquons avec fierte le French kiss
DfwRevolution From United States of America, joined Jan 2010, 1033 posts, RR: 51
Reply 3, posted (10 years 4 months 2 weeks 3 days 18 hours ago) and read 1711 times:
The Ge90 is becoming a very popular engine on the 777 because the GE powerplant is the only engine that can power the new 773ER/772LR and soon 772LRF variants.
When the 773ER/772LR were being developed, GE's engine could meet the thrust requirements in the shortest amount of time. Boeing needed to hustle on the project, so GE took advantage of the situation by offering to cover some of the development cost *if* the GE engine was the *only* engine allowed on the 773ER/772LR. GE also had the advantage of being partnered with the leasing firm GECAS, so it worked well for both Boeing and GE. Boeing agreed that all 777s heavier than 700,000 lbs *must* be powered by the Ge90.
However, the Ge90 is a very heavy engine. On the 772ER, the Ge90-92 and Trent 892 offer the same amount of thrust, but each Trent engine weights almost a ton less. Thus, an airline that chooses the Trent engine can carry that much extra payload, or save on fuel burn.