MRO: Engines

Fleet leader

The engine shop at United Technical Operations' Maintenance Center in San Francisco handles a variety of powerplants to meet all customer needs. We deliver quick turn times, technical expertise, and renowned United quality and safety on all of our work.

Proven expertise:

  • As the launch customer for Boeing 777s, our experience with PW4077s and PW4090s is unparallel. Our engine shop is one of two MRO centers equipped to support the PW4090/112” inch engine.
  • United Technical Operations has a team of more than 1,000 experienced engine maintenance employees ready to meet our customers' needs.


  • Engine & Module Repair and Overhaul
  • Repair to OEM or UAL Maintenance Specifications
  • Utilize OEM and/or PMA parts (Customer option)
  • Support all ATA chapters related to engine repair
  • Flame spray, HVOF, plasma spray, plating, case welding
  • Machine & manufacturing
  • Combustor overhaul
  • Accessory overhaul
  • High speed rotor balance & blade tip grinding
  • Nondestructive testing and diagnostics
  • Engine preservation and borescope inspections
  • Engine condition and trend monitoring analysis
  • Engineering support – work scope and repair development
  • ODA FAA approved authority for Major Repairs
  • Engine testing capabilities: including the only PW4000 112” test cell in North America
  • PLI & storage
  • FAR Part 145 and Part 121 repair authority

Contact Us

If you need additional information about our services please contact us.




Agency approval

  • CAAC
  • CAAS
  • CASA
  • DAC
  • DGCA
  • EASA
  • FAA
  • GCAA
  • JCAB
  • NCAA
  • QCAA

Approvals vary by location