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IR.IV.A.K3FAA-S-ACS-8C · Nov 2023Knowledge

Normal and abnormal instrument indications and operations.

ACS element text (the applicant demonstrates understanding of)

Normal and abnormal instrument indications and operations.

Bottom line

As soon as the unusual attitude is detected, the recommended recovery procedures stated in the POH/AFM should be initiated.

Key numbers

Key numbers for Normal and abnormal instrument indications and operations.
NumberWhat it means
within 5° of known runway directionHI taxi check
tips in excess of 5° during taxi turnsAI taxi limit
up to 5 degrees pitch-and-bankNonspillable AI error
approximately 55° pitch and 55° bankHI tumble limits

FAA references

  1. IPH App. A (p. A-3) — FAA-H-8083-16B
  2. IFH ch. 7 (pp. 7-26–7-27) — FAA-H-8083-15B
  3. IFH ch. 5 (pp. 5-37–5-38) — FAA-H-8083-15B
  4. PHAK ch. 8 (p. 8-22) — FAA-H-8083-25C (2023)
  5. AFH ch. 18 (pp. 18-15–18-16) — FAA-H-8083-3C
  6. AFH ch. 12, Operational Procedures (p. 12-15) — FAA-H-8083-3C
  7. IPH ch. 4 (p. 4-37) — FAA-H-8083-16B
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