[jehae03]

Hi,

I would like to ask a clarification regarding the snapshot numbers (e.g., 1 to 8) in the dataset.

Do the same snapshot numbers represent the same operating condition across all engines? Or are the snapshot numbers only meaningful within each engine?

Additionally, are the snapshot numbers ordered in time — for example, does Snapshot 1 always come before Snapshot 8 in the same engine?

Thank you very much.

[adiabatic]

Sorry for the delay in responding.
The same snapshot numbers represent similar, but NOT the same operating conditions. The snapshot numbers are indeed ordered in time, nominally at:
1. Takeoff, Mach 0
2. Takeoff, Rotation
3. End of takeoff power
4. Climb, approx. 20K ft
5. Climb, approx. 30K ft
6. Top of Climb (beginning of cruise)
7. Mid Cruise
8. End of Cruise
Depending on the flight profile, not all flights many have all eight snapshots, although most should.

One more thing — engine health parameters are assumed to be constant for a single flight, so that they are the same for all eight snapshots!

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