Engines

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Maintaining for the future for more than 85 years

Excellent service, compliant technical support and proven reliability – that’s what you get when you work with the engine shop at our San Francisco Maintenance Base. Our engine shop offers complete maintenance, repair and overhaul (MRO) services, as well as advanced computer-controlled testing and on-wing repair. Our technicians have vast experience on many products, and have built a legacy of delivering quick turn times, technical expertise and renowned quality and safety on all of their work.

  • With United as the launch customer for the Boeing-777 aircraft, United Technical Operations’ experience with the PW4000-112" engine is unequaled. We are the only MRO facility in the United States equipped to work on this engine type.
  • In the past 18 years, United Technical Operations has overhauled more than 1,000 large and small fan PW4000-series engines.
  • United Engine Maintenance (SFO/CHS) was awarded the 2011 Outstanding Supplier Award for our F117 support.
  • We have the leading ring-case modification facility.

Our capabilities and certifications

Engines

Pratt & Whitney
PW2000
PW4056
PW4060
PW4077
PW4090

Certifications

FAA PART 121
FAA PART 145
FAA ODA
FAA/EASA dual release
ISO AS9100
CAA
CAAC
CAAS
DCA
EASA
JCAB
MOLIT
Capabilities vary by station
See station capabilities
  • Engine and 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 and case welding
  • Machine and manufacturing
  • Combustor overhaul
  • Accessory overhaul
  • High-speed rotor balance and 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
  • Engine testing capabilities, including the only PW4000-112” test cell in North America
  • PLI and storage
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Line maintenance station capabilities
ATL
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
AUS
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
BOS
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
CLE
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
DCA
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
DEN
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
DFW
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
EWR
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
EZE
Daily coverage
08:00-22:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
FLL
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
GUM
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
HNL
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
IAD
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
IAH
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
JFK
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
KIX
Daily coverage
11:00-22:00
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
KOA
Daily coverage
11:00-00:00
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
LAS
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
LAX
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
LGA
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
LHR
Daily coverage
05:30-00:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
LIH
Daily coverage
12:00-22:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
MCO
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
MEX
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
MIA
Daily coverage
12:00-19:00
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
MSY
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
NRT
Daily coverage
05:00-22:00
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
OGG
Daily coverage
11:00-00:00
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
ORD
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
PDX
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
PHL
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
PHX
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SAN
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SAT
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SEA
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SFO
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SMF
Daily coverage
22:00-08:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SNA
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
SYD
Daily coverage
05:30-15:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
TPA
Daily coverage
24 hr
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500
TPE
Daily coverage
05:00-01:30
Aircraft
HGR
A319
A320
A380
B737
B747
B757
B767
B777
B787
Engines
CF6
GE90
GEnx
CFM56
PW2000
PW4000
RB211
V2500