LUKEAFBI11-400 — G-risk Indicator Management (grim)

LUKEAFBI11-400 governs G-performance risk management for student pilots in the USAF Basic Operational Training Course at Luke AFB.

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  • Publication number: LUKEAFBI11-400
  • Title: G-RISK INDICATOR MANAGEMENT (GRIM)
  • Date: 2023-08-23

View LUKEAFBI11-400 on armypubs.army.mil


It covers risk assessment, G-performance indicators, aircrew conditioning, anti-G equipment, and training responses. The instruction requires assessments of student condition and performance under G to identify risk and support tailored training programs.

Applies to: This publication applies to the Air Force Reserve Command (AFRC) and to Air National Guard (ANG) and their units.

Topics covered

  • G-performance risk indicators
  • G-induced loss of consciousness
  • Anti-G straining maneuvers
  • Student pilot assessments
  • G-tolerance and G-endurance
  • Tailored ground training programs

Questions and answers

What does GRIM assess at the start of basic course ground training?

GRIM consists of initial assessment of a student’s previous high-G-performance and present physical condition at the start of basic course ground training and assessment of student’s performance under G while flying.

How are GRIM assessments used?

Observations from these assessments are used to qualitatively determine the level of risk for the student and, if necessary, assist in development of tailored training programs for the student’s specific needs.

What helps aircrew manage G-performance?

An effective anti-G straining maneuver (AGSM), optimum physical conditioning, functioning anti-G equipment and adequate G-oriented situational awareness are all important to aircrew G-performance.

What is an anti-G straining maneuver?

Sustained lower body muscle tensing/straining and short air exchanges against a closed glottis in 3-second cycles.

What is the average total incapacitation period after a GLOC?

After a GLOC the average total incapacitation period is 24 seconds.

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