Walkaround

Engines · Pratt and Whitney

PW4000

PW4000-94, PW4000-100, PW4000-112

out of production, in service 3 min read · updated 11 October 2026 · checked 11 October 2026

Turbofan model under test
An ultra high bypass ratio turbofan model in a NASA wind tunnel. Credit NASA.

At a glance

Engine card

VariantsPW4000-94, PW4000-100, PW4000-112
ArchitectureTwo shaft turbofan, three fan diameters across the family
Thrust52,000 to 99,000 lbf
Applications767, 777, A330ceo, MD-11, 747-400
Built byPratt and Whitney
StatusOut of production, in service

Program and production

The PW4000 is a case study in what happens when fleet renewal stalls.

Mature engines that were supposed to be facing retirement are instead returning to maintenance shops, and could stay in service for another decade, because airlines do not have replacement aircraft options. The PW4000 is named specifically as one of the engines that has resurged over the past couple of years.

The cause is familiar across this site. The 777X is years late, 787 deliveries lag production because of seat supply, and the A330neo had a three month delivery halt in 2026. Every one of those delays keeps a PW4000 powered widebody flying that its operator had planned to retire.

Technical and maintenance

The engine itself is well understood. The problem is material.

Finding parts to support shop visits on an out of production engine is the central difficulty, and used serviceable material plus repair development is how the industry is covering it. Pratt is evaluating new repair schemes and modified workscopes to support the ageing fleet, which is the standard OEM response when new parts production no longer makes commercial sense.

In plain terms

Used serviceable material is a part taken from a retired or torn down engine, inspected, and returned to service. For an out of production engine it is often the only source, because the factory no longer makes the part. That makes teardown supply, and therefore the retirement rate of other aircraft, a direct input to whether your engine can be repaired.

On the line

Parts scarcity is already described as a threat to ageing 777 operations on this engine. Build longer lead times into rotable planning than the quoted figures suggest, and treat your own teardown candidates as a strategic asset rather than scrap value. Where a repair scheme exists as an alternative to replacement, getting the approval in place before you need it is worth more than finding out during an aircraft on ground event.

Shop capacity is expanding to meet the demand. CTS Engines technicians have been training for the highest level of certification on the PW4000, with services expected to be released in 2026, which adds a source of capacity the fleet will need.

Applications and fleet

Across its three fan sizes the PW4000 powers 767s, 777s, A330ceos, MD-11s and 747-400s. On the 767 it competes with the GE CF6-80C2.

The freighter market is what sustains much of this fleet. Cargo operators fly older airframes harder and longer than passenger carriers, and with 767 production ending in 2027 and the 777-8F not arriving until 2028, there is no near term replacement for a lot of this capacity.

Safety

No significant developments since 11 October 2026.

No Airworthiness Directive of fleet wide significance was issued against the family in this period.

Sources