AFGSCI21-152 — Engine Trending & Diagnostic (et & D)

AFGSCI21-152 governs the Air Force Engine Trending and Diagnostics program for engine safety, reliability, failure detection, and maintenance cost reduction.

Search AFGSCI21-152

  • Publication number: AFGSCI21-152
  • Title: ENGINE TRENDING & DIAGNOSTIC (ET & D)
  • Date: 2025-02-24

View AFGSCI21-152 on armypubs.army.mil


It covers Operations Group POC and ET&D Project NCO responsibilities, including program coordination, data analysis, feedback, equipment tracking, and software improvement recommendations. It requires engine performance data entry, training for ET&D Monitors, and documented handling of engines placed on watch status.

Topics covered

  • Engine Trending and Diagnostics
  • Engine performance data
  • ET&D Monitor duties
  • Watch engine documentation
  • Field Service Evaluation
  • CEMS/CETADS software

Questions and answers

What is the ET&D program intended to accomplish?

The ET&D program is intended to further the safe operation, performance reliability, and lower maintenance operating costs of installed gas turbine engines. (paragraph 1)

How must the ET&D program be administered?

Administer the ET&D program in accordance with this instruction and applicable technical orders. (paragraph 7)

How quickly must engine performance data be entered?

Enter engine performance data in the ET&D computer no later than the end of the next flying day. (paragraph 8)

What access does the Project NCO have for F103 engines?

For F103 engines, the Project NCO will have “view only” access to the General Electrics (GE) website. (paragraph 8)

What qualification must an ET&D Program Monitor have?

Have a 2A671 AFSC or civilian equivalence. (paragraph 8)

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