AMTStandards.orgAviation maintenance

Quick reference

Terms on this page 4

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

Readings in the sources

6 short readings for AF-J, 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. Architecture, tank types K1–K3, S2

    For the test: System types; components including filters and selector valves; tanks and cells

    • FAA-H-8083-31B Ch. 14: Fuel Tanks · Integral Fuel Tanks · Bladder Fuel Tanks · Removable Fuel Tanks · Fuel Valves · Fuel Filters

  2. Flow paths, indication methods K4, K5, K9

    For the test: Fuel flow; transfer, fueling and defuelling; quantity indication

    • FAA-H-8083-31B Ch. 14: Fuel Quantity Indicating Systems · Fueling & Defueling Procedures · Defueling

  3. Procedures K8

    For the test: Maintenance and inspection

    • FAA-H-8083-31B Ch. 14: Fuel Tank Repair · Fuel Contamination Control

  4. Safety practice R1, R3, R5

    For the test: System maintenance; fuel spills; defuelling

    • FAA-H-8083-31B Ch. 14: Fire Hazards When Fueling or Defueling

  5. Sources and detection R2

    For the test: Contamination

    • FAA-H-8083-31B Ch. 14: Foreign Fuel Contamination

  6. Leak classification, defect location, tank repair, troubleshooting S1

    For the test: Inspect, check, troubleshoot or repair a fuel system

    • FAA-H-8083-31B Ch. 14: Troubleshooting the Fuel System · Fuel System Repair · Location of Leaks & Defects · Fuel Leak Classification

Source: FAA-H-8083-31B, fuel 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–K3, S2 System types; components including filters and selector valves; tanks and cells Architecture, tank types Ch. 14 — Fuel Tanks; Integral Fuel Tanks; Bladder Fuel Tanks; Removable Fuel Tanks; Fuel Valves; Fuel Filters Why an integral tank is different to work on
K4, K5, K9 Fuel flow; transfer, fueling and defuelling; quantity indication Flow paths, indication methods Ch. 14 — Fuel Quantity Indicating Systems; Fueling & Defueling Procedures; Defueling Capacitance against float — AF-J Concepts §5
K6 Jettison and dump systems — — Transport-category; no skill attached
K7 Fuel characteristics Grades, colors, properties Not in this handbook The TCDS is the authority — GEN-F Concepts §3
K8 Maintenance and inspection Procedures Ch. 14 — Fuel Tank Repair; Fuel Contamination Control —
R1, R3, R5 System maintenance; fuel spills; defuelling Safety practice Ch. 14 — Fire Hazards When Fueling or Defueling; Fueling & Defueling Procedures —
R2 Contamination Sources and detection Ch. 14 — Fuel Contamination Control; Foreign Fuel Contamination AF-J Concepts §3
R4 Fuel tank entry — — AF-J Concepts §2 — the most dangerous job here
S10–S14, S16 Locate — operating instructions, inspection, crossfeed, placards, defuelling, fuel temperature — — Transport-category systems; documentation satisfies them
S1 Inspect, check, troubleshoot or repair a fuel system Leak classification, defect location, tank repair, troubleshooting Ch. 14 — Troubleshooting the Fuel System; Fuel System Repair; Location of Leaks & Defects; Fuel Leak Classification Leak classification is a named scale — stain, seep, heavy seep, running leak — and the class decides whether the aircraft flies
S7 Drain fuel system sump(s) — Not in this handbook The AMM gives the sump locations and the sequence. Missing one is how water stays in the aircraft — AF-J Concepts §2

The operative sources

  • The aircraft maintenance manual for defuelling, tank access, sealant type, and torque values.
  • The manufacturer's tank entry procedure, and confined-space requirements, for R4.
  • The TCDS and the filler placard for approved fuel (GEN-F).

License

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