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Upskill / Maintenance / Circular economy in aviation and aerospace 3: engines, green time and the USM market

Circular economy in aviation and aerospace 3: engines, green time and the USM market

Engine value and green time, life extension and shop-visit avoidance, repair versus replace, pricing used serviceable material and market cycles, lease-return conditions, and quality and counterfeit risk from the trader's side. Part 3 of the Circular economy in aviation and aerospace series.

By Aerospace Garage Desk · Managing it · 45 minutes · 24 narrated pages

What you will be able to do

  • ✓ Value an engine from a half-life reference by adjusting for its life-limited parts and its performance, and state its green time.
  • ✓ Compare a performance restoration, a green-time lease and a green-time engine purchase on net cost per cycle used, and apply module swaps and used life-limited parts within the rules.
  • ✓ Distinguish manufacturer's repair data, data approved by a designated engineering representative and PMA parts, and choose between repair and replacement on expected cost and value effect.
  • ✓ Explain how used serviceable material is priced against list price, read trade condition codes, price a used life-limited part pro rata, and describe how prices move over a type's life.
  • ✓ Apply engine lease-return conditions, compare maintenance reserves with end-of-lease compensation, and calculate a return settlement including records gaps.
  • ✓ Run a trader's quality system and due diligence against suspected unapproved parts, and respond to an alert, using the AOG Technics case.

Course content

Session 1 · Engine value and green time

1.1

  1. The engine as an asset · free preview
  2. Life-limited parts: the stack, the limiter and the stub
  3. Performance: exhaust gas temperature margin as a clock
  4. Worked example: valuing K-9's engine from half-life
Session 2 · Life extension and shop-visit avoidance

1.2

  1. Green-time engines and green-time leases
  2. Module swaps and life-limited part substitution
  3. Part-life optimisation
  4. Worked example: finishing the extension at the lowest cost per cycle
Session 3 · Repair versus replace

1.3

  1. When a part fails inspection
  2. Approved repair data, named carefully
  3. The repair-or-replace test
  4. Worked example: turbine blades on a spare engine
Session 4 · Pricing used serviceable material and market cycles

1.4

  1. How used serviceable material is priced
  2. Condition codes and what they are worth
  3. Market cycles: supply, demand and the life of a type
  4. Worked example: pricing a used turbine disc
Session 5 · Lease-return conditions

1.5

  1. Engine return conditions: what the lease asks for
  2. Maintenance reserves and end-of-lease compensation
  3. Records at return: proving every cycle
  4. Worked example: settling K-14's engine at return
Session 6 · Quality and counterfeit risk from the trader's side

1.6

  1. Why traders carry the risk
  2. Quality systems for distributors
  3. Due diligence at the trader's desk
  4. From the investigation file: AOG Technics and the falsified release certificates
  • MRO deals and approvals, 5-11 Nov 2026

    3 · World n/a

    Aviation Week and AviTrader, 9-11 Nov 2026

Market Pulse →

Who this course is for

  • Lessor and airline asset managers who value engines, plan shop visits and negotiate lease returns
  • Engine shop, powerplant and technical records staff who decide repair or replace and prove every cycle at return
  • Parts traders and quality managers who price used serviceable material and guard against unapproved and falsified parts

You need: Circular economy in aviation and aerospace 2: retirement, storage and teardown, or working experience with engines, leases or parts trading.

Upskill courses are for professional development and are not approved by any aviation authority. Learner Terms

Course content © Aerospace Garage Limited. All rights reserved.