PA.VIII.B.K1cFAA-S-ACS-6C · Nov 2023Knowledge
c. Function and operation
Flight instruments as they relate to: c. Function and operation
Bottom line
The source of the pressure for operating the airspeed indicator, the vertical speed indicator (VSI), and the altimeter is the pitot-static system. The attitude indicator gives a direct and immediate indication of the pitch attitude of the aircraft. The altimeter is an instrument that measures the height of an aircraft above a given pressure level.
Key numbers
| Number | What it means |
|---|---|
| 29.92 in Hg internal pressure in each altimeter aneroid wafer | Wafer vacuum |
FAA references
- AFH ch. 18 (pp. 18-14–18-15) — FAA-H-8083-3C
- IFH ch. 6 (p. 6-4) — FAA-H-8083-15B
- PHAK ch. 8 (p. 8-3) — FAA-H-8083-25C (2023)
- AFH ch. 13 (p. 13-8) — FAA-H-8083-3C
- PHAK Glossary (p. G-23) — FAA-H-8083-25C (2023)
- IFH Glossary (p. G-9) — FAA-H-8083-15B
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