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IR.III.A.R1FAA-S-ACS-8C · Nov 2023Risk management

Less than full understanding of an ATC clearance.

ACS element text (the applicant demonstrates understanding of)

Less than full understanding of an ATC clearance.

Bottom line

Instrument clearances can be overwhelming when attempting to copy them verbatim. It is recommended that pilots read their IFR clearance back to the clearance delivery controller. When a pilot is uncertain of an ATC clearance, that pilot shall immediately request clarification from ATC.

FAA references

  1. 14 CFR 91.123 (Compliance with ATC clearances and instructions.) — eCFR current as of 2026-03-05
  2. RMH ch. 6 (pp. 6-2–6-3) — FAA-H-8083-2A
  3. IFH ch. 2 (p. 2-5) — FAA-H-8083-15B
  4. IPH ch. 1 (p. 1-43) — FAA-H-8083-16B
  5. IPH ch. 1 (p. 1-6) — FAA-H-8083-16B
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