With Rolls-Royce’s Trent 1000 entering service this week, following on from other newer engine types such as the LEAP and the PW1000G joining the global fleet in recent years, it’s sometimes easy to overlook the in-service stalwarts that will generate the lion’s share of engine maintenance work over the next decade.

In a commercial aviation engine MRO market anticipated by Aviation Week to measure at a record high of $25.9 billion next year, a 2.5 billion rise from 2017’s $23.4 billion market value, the attention will be on firmly on narrowbody engines such as the CFM56-7B, the -5B variant and the V2500-A5.

The CFM56-7B, powering the Boeing 737NG which have seen approximately 351 deliveries this year according to its manufacturer, will account for the lion’s share of this with an estimated 21% share of the engine MRO market, according to Aviation Week Fleet & MRO Forecast data.

Tied for second are the CFM56-5B for the Airbus A320 and IAE’s V2500, which powers all variants of the A320 family and rather more scarcely in 2017, the McDonnell Douglas MD-90 – scheduled to be phased out of the fleet of its remaining operator Delta Air Lines in the coming years.

While the sheer numbers of Boeing and Airbus narrowbodies in the world’s fleets make it somewhat unsurprising that this is where work will be centered on, the widebody engine MRO market is an altogether more interesting proposition.

Like with narrowbodies, maintenance demand is expected to revolve around mature engine types, with the GE90 having the biggest market share, followed by Rolls-Royce’s Trent 700. Of the newer engine types, it will be the GEnx found on the 787 and LEAP-1B variant used on the Boeing 737MAX and one of the engines eventually set to supplant the CFM56 that will start to make an impact on the aftermarket.

However, the introduction of newer engine types a long-term concern, and it won’t be surprising to see MROs of all sizes retain their focus for a number of years on in-service engines, and perhaps, continue introducing of new capabilities and offerings for these engine types.

An in-depth analysis of the engine MRO market will feature in the 2018 Engine Yearbook.