Top Nine Questions Customers Have About Aircraft Engines

January 2025

I travel extensively throughout the Southeast region of the United States, visiting Duncan Aviation customers and introducing myself to new prospects. I listen to their needs and answer all their questions. Although they may work for different companies and fly different make/models of aircraft, they have the same concerns and questions when it comes to maintaining aircraft.

When we discuss Duncan Aviation engine services, I can just about predict what they will ask. So much so that I started writing a list of the questions with answers so I was prepared to respond with the most correct information.

I’m also quite certain that aircraft operators everywhere are interested in this information.

Here are the answers to the most common aircraft engine service questions I am asked when visiting customers:

Question: What engine platforms is Duncan Aviation authorized in? 

Answer:

Honeywell

• TFE731 Line/Major/Heavy/test cell
• HTF7000/AS907 Line/Minor
• CFE738 / ALF502 Line
• APU Line
• Field service troubleshooting
• Field service engine changes

Pratt & Whitney

Duncan Aviation is a Pratt & Whitney Canada Designated Overhaul Facility or DOF. A new overhaul facility is being constructed in Lincoln, Nebraska, to conduct hot sections, major repairs, and overhauls on PW530A, PW535A, PW535B, PW535E, PW545A, PW545B, PW545C, PW305A, PW305B, PW306A, PW306C, PW307A, PW307D, PW308A, and PW308C models. Hot section inspection services are operational. Full in-house repair and overhaul capabilities are coming online in early 2026.

• PW300 Series Line/Hot Section Inspection
• PW500 Series Line/Hot Section Inspection
• Field service troubleshooting
• Field service engine changes

 Rolls Royce

• BR710 A1-10, C4-11, A2-20 Line
• Spey 511-8/Tay 610-8, 611-8C Line
• AE3007A Line

GE

• CF34 Line

Williams

• FJ44 Line

Question: Does Duncan Aviation have an available turbine engine rental pool?

Answer: 

Duncan Aviation-owned, in-house inventory of available rental engines:

• HTF7000
• HTF7350
• TFE731 (-2C, -3, -5B, -5R -20, -40, and -60)
• Access to OEM rental banks for all engine models

Question: What engine maintenance service plans do Duncan Aviation support? 

Answer: MSP, MSP Gold, ESP, ESP Gold, ESP Platinum, EAP, CorporateCare, CorporateCare Enhanced, On-Point, Smart Parts, Tap, Tap Blue, Tap Elite, JSSI, New Engine Warranty.

Question: What is the average downtime for an MPI (Major Periodic Inspection) event? 

Answer: 

Due to the current industry environment where parts availability is inconsistent, this is difficult to predict accurately.

However, with advanced scheduling, early commitment, and parts availability, your engines will spend about 3-4 weeks in the Duncan Aviation engine overhaul shop in addition to engine R&Rs.  

Question: What is the average downtime for a CZI (Core Zone Inspection) event? 

Answer: 

Similar to the answer above, for a CZI, we encourage you to commit to early scheduling and plan for a 45-day average downtime. Parts availability can cause downtime to extend from six months to a year.

Questions: What is the average downtime for a Pratt & Whitney Engine Hot Section Inspection? 

Answer: The average downtime for a Pratt & Whitney engine Hot Section Inspection depends on the engine model, parts availability, and the scope of required work. Here’s a general timeline based on ideal conditions, including early scheduling, parts availability, and no machining needed: 

• PW535: 10-14 days
• PW545: 14-21 days

Question: Does Duncan Aviation have access to Honeywell serviceable engine parts?

Answer: Duncan Aviation has several million dollars of serviceable engine parts available.

Question: What is Duncan Aviation's engine warranty?

Answer: Duncan Aviation covers workmanship from major event to major event or next entry.

Question: Does Duncan Aviation have technicians capable of changing engines in the field? 

Answer: Duncan Aviation has several Rapid Response Teams throughout the US, capable of in-the-field troubleshooting and engine changes.

Duncan Aviation Fact Sheets

At Duncan Aviation, we are committed to simplifying your search for aircraft-related answers.

Our Capabilities Fact Sheets offer a concise overview of the extensive services we provide. These fact sheets highlight our expertise across our main service areas, including Aircraft Sales, Airframe, Avionics, Completions, Engine/APU, Engineering, Manufacturing, FBO Services, OEM Services, Parts and Components, Specialized Services, and Government Programs.