Airport Ground Support Equipment worked example

GSE Spare Parts Buffer Days with critical gse spare parts on hand of 1,100 parts: a worked example

What does the result look like when critical gse spare parts on hand reaches 1,100 parts? The full calculation is worked below with real intermediate numbers. a fleet maintenance manager needs to check spare coverage for airport GSE uptime

The inputs for this scenario

  • Critical GSE spare parts on hand: 1,100 parts (raised for this scenario; the documented default is 420)
  • Expected daily spare parts usage: 18 parts/day (unchanged)
  • Lead-time and criticality safety factor: 1.4 x (unchanged)

Working through the calculation

  • Applying the documented formula (Base spare parts days on hand = critical spare parts on hand รท expected daily spare parts usage) to the inputs above produces each figure below.
  • At this operating point the engine returns 43.65 buffer days for protected gse spare parts buffer, the number this scenario is built around.
  • At this operating point the engine returns 61.11 days for base spare parts days on hand.
  • At this operating point the engine returns 1,100 parts for critical gse spare parts on hand.
  • At this operating point the engine returns 18 parts/day for expected daily spare parts usage.

How this compares with the baseline

  • Against the tool's baseline example, where critical gse spare parts on hand sits at 420 parts and the headline result is 16.67 buffer days, this scenario comes in 162% above the baseline at 43.65 buffer days.
  • A figure at this level is achievable when critical gse spare parts on hand is genuinely sustained, not just peaked for a shift. It assumes steady average daily usage; a single AOG-style event or seasonal traffic spike can burn through the buffer far faster than the average predicts.

Results at a glance

  • Protected GSE spare parts buffer: 43.65 buffer days (headline result)
  • Base spare parts days on hand: 61.11 days
  • Critical GSE spare parts on hand: 1,100 parts
  • Expected daily spare parts usage: 18 parts/day

Run it with your numbers

  • Every input above is editable in the live GSE Spare Parts Buffer Days calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.