HOLLOMANAFBI11-100 — Flying Operations - G-RISK INDICATOR MANAGEMENT (GRIM)

HOLLOMANAFBI11-100 governs management of G-performance risk factors for student pilots in the USAF Basic Course F-16C/D at Holloman Air Force Base.

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  • Publication number: HOLLOMANAFBI11-100
  • Title: Flying Operations - G-RISK INDICATOR MANAGEMENT (GRIM)
  • Date: 2020-08-14

View HOLLOMANAFBI11-100 on armypubs.army.mil


The publication describes GRIM assessments, G-performance risk indicators, control procedures, and terms related to acceleration effects. It requires compliance and supports tailored training intended to optimize combat capability and increase flying safety.

Applies to: This publication applies to the Air Force Reserve Command (AFRC) and Air National Guard (ANG) pilots flying 54 FG aircraft with Formal Training Unit (FTU) students.

Topics covered

  • G-performance risk management
  • F-16 B-course student pilots
  • G-induced loss of consciousness
  • Anti-G straining maneuver
  • G-tolerance and G-endurance
  • Risk control indications
  • Tailored ground training

Questions and answers

How does GRIM assess student pilot G-performance risk?

GRIM consists of initial assessment of a student’s previous high-G performance and present physical condition at the start of F-16 B-course ground training and assessment of student’s performance under G while flying the F-16.

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 GLOC?

GLOC. The transition from normal consciousness to a state of unconsciousness that results when blood flow to the nervous system under G is reduced below critical levels to support conscious function.

Can GRIM measures be used for students in Transition or Specialized Officer Courses?

If students in Transition (TX) courses or Specialized Officer Courses (SOC) demonstrate problems with G-performance while at Holloman AFB, GRIM program definitions, courses of action and control measures may be utilized at the discretion of the Fighter Squadron (FS)/Commander (CC) or FS/Director of Operations (DO).

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