AMTStandards.orgAviation maintenance

Quick reference

Terms on this page 10

Dotted in the text; open one for its entry, or see the glossary.

Readings in the sources

6 short readings for AF-F, a topic at a time: what the test asks, and the sections that cover it. Sign in to tick them off as you read.

  • FAA-H-8083-31B Aviation Maintenance Technician Handbook — Airframe

  1. System architecture, component function K1–K4

    For the test: Components and fluids; operation; servicing; inspection, check and troubleshooting

    • FAA-H-8083-31B Ch. 12: Aircraft Hydraulic Systems · Hydraulic Fluid · Types of Hydraulic Fluids · Reservoirs · Pumps

  2. Accumulator types and charging K5–K7

    For the test: Pneumatic types and components; pneumatic servicing; accumulators

    • FAA-H-8083-31B Ch. 12: Aircraft Pneumatic Systems · Pneumatic Systems · Pneumatic System Components · Accumulators · Types of Accumulators · Pneumatic Power System Maintenance

  3. Seal types and materials K8, S2, S3, S16

    For the test: Seals, packings, backup rings, and fluid–seal compatibility

    • FAA-H-8083-31B Ch. 12: Seals · Seal Materials · Packings · V-Ring Packings · Backup Rings

  4. Component function and servicing K10, K11, S5, S6

    For the test: Regulators, restrictors, valves; filter maintenance

    • FAA-H-8083-31B Ch. 12: Control Valves · Flow Control Valves · Pressure Control Valves · Shuttle Valves · Filters · Filter Units · Maintenance of Filters

  5. Fluid storage and handling R3–R5

    For the test: Fluid storage and handling; cross-contamination; seal and fluid compatibility

    • FAA-H-8083-31B Ch. 12: Hydraulic Fluid Contamination · Intermixing of Fluids · Contamination Control · Contamination Check

  6. Overheat detection, and where bleed air comes from S10

    For the test: Locate procedures for checking pneumatic and bleed air overheat warning systems

    • FAA-H-8083-31B Ch. 17: Fire Detection/Overheat Systems · Overheat Systems
    • FAA-H-8083-31B Ch. 16: Bleed Air Systems

Source: FAA-H-8083-31B, hydraulic and pneumatic power systems chapter. Public domain. Pointers only.

Chapter and section verified against FAA-H-8083-31B, 2023 edition, on 28 August 2026. Page numbers are deliberately not cited: they move between printings, and a citation that rots silently is worse than a coarser one that stays true. Checked by our handbook citation check against our index of the handbook's chapters and sections.

Elements The ACS asks for In the handbook Where in FAA-H-8083-31B What it does not give you
K1–K4 Components and fluids; operation; servicing; inspection, check and troubleshooting System architecture, component function Ch. 12 — Aircraft Hydraulic Systems; Hydraulic Fluid; Types of Hydraulic Fluids; Reservoirs; Pumps Pascal and force multiplication — GEN-J Concepts §3
K5–K7 Pneumatic types and components; pneumatic servicing; accumulators Accumulator types and charging Ch. 12 — Aircraft Pneumatic Systems; Pneumatic Systems; Pneumatic System Components; Accumulators; Types of Accumulators; Pneumatic Power System Maintenance Why an accumulator is dangerous. AF-F Concepts §1
K8, S2, S3, S16 Seals, packings, backup rings, and fluid–seal compatibility Seal types and materials Ch. 12 — Seals; Seal Materials; Packings; V-Ring Packings; Backup Rings Why the wrong fluid destroys the wrong seal. AF-F Concepts §2
K9 Hoses, lines and fittings — — Taught in GEN-D
K10, K11, S5, S6 Regulators, restrictors, valves; filter maintenance Component function and servicing Ch. 12 — Control Valves; Flow Control Valves; Pressure Control Valves; Shuttle Valves; Filters; Filter Units; Maintenance of Filters —
R1, R2 Relieving pressure before servicing; high-pressure gases and fluids Safety practice Ch. 12 — Accumulators; Pneumatic Power System Maintenance AF-F Concepts §1
R3–R5 Fluid storage and handling; cross-contamination; seal and fluid compatibility — Ch. 12 — Hydraulic Fluid Contamination; Intermixing of Fluids; Contamination Control; Contamination Check AF-F Concepts §2
S10 Locate procedures for checking pneumatic and bleed air overheat warning systems Overheat detection, and where bleed air comes from Ch. 17 — Fire Detection/Overheat Systems; Overheat Systems · Ch. 16 — Bleed Air Systems The check procedure is the AMM's. This is a Locate element
S13, S14 Inspect a hydraulic or pneumatic system for leaks; troubleshoot one Seals and packings as the usual source, and system maintenance Ch. 12 — Seals; Seal Materials; Packings; Pneumatic Power System Maintenance; Contamination Check A weeping seal and a running leak are different findings. The limits are the manufacturer's, and AF-F Concepts §2 is why the distinction matters

The operative sources

  • The aircraft maintenance manual for the depressurization procedure, accumulator precharge, torque values and the approved fluid.
  • The safety data sheet for the fluid — phosphate-ester fluids in particular are aggressive to skin, eyes and paint.
  • The component manual for seal installation and backup ring orientation.

Fluid families

--- --- ---
Mineral-based Typically dyed red
Phosphate-ester Typically dyed purple

They are not interchangeable and they require different seal materials (AF-F Concepts §2). Color is a check, not an authority — the aircraft's placard and manual specify the approved fluid.

License

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