FlyCurrentFLYCURRENT
AA.I.A.K4FAA-S-ACS-11A · Nov 2023Knowledge

Fuel system–capacity, drains, pumps, controls, indicators, cross-feeding, transferring,...

ACS element text (the applicant demonstrates understanding of)

Fuel system–capacity, drains, pumps, controls, indicators, cross-feeding, transferring, jettisoning, fuel grade, color and additives, fueling and defueling procedures, and fuel substitutions.

Bottom line

A sump is a low point in a fuel system and/or fuel tank. Never take off until all water and contaminants have been removed from the engine fuel system. If the proper grade of fuel is not available, use the next higher grade as a substitute.

Key numbers

Key numbers for Fuel system–capacity, drains, pumps, controls, indicators, cross-feeding, transferring,...
NumberWhat it means
about 19 percent less lead than 100LL100VLL lead cut

FAA references

  1. PHAK ch. 7 (p. 7-27) — FAA-H-8083-25C (2023)
  2. AFH ch. 2 (pp. 2-9–2-10) — FAA-H-8083-3C
  3. AFH ch. 9 (p. 9-29) — FAA-H-8083-3C
  4. SEA ch. 7 (p. 7-4) — FAA-H-8083-23
Members lesson

Build understanding you can use

Unlock the full lesson and continue studying this element.

  • Full teaching sections: What it is; Key points; Rules and numbers; How it is done
  • Check your understanding with answers you can reveal
  • Common mistakes paired with the FAA facts that correct them
View membership options