Aircraft Performance and Density Altitude
- Episode: core-10
- Version: 0.1.5
- Source verification: FAA/eCFR links and page-level citations were revalidated August 28, 2026; source-relevance review is complete for version 0.1.5.
In this episode
- What ACS Task PA.I.F expects a private-pilot applicant to connect.
- Why pressure altitude and density altitude are different performance references.
- How pressure, temperature, elevation, and moisture affect air density.
- How indicated, calibrated, true, and groundspeed differ in performance planning.
- Why thin air changes normally aspirated engine power, propeller thrust, wing lift, takeoff distance, and climb performance.
- How to read a POH or AFM performance chart from its title and conditions through its inputs and outputs.
- How takeoff ground roll differs from total distance over an obstacle.
- How climb angle differs from climb rate, and how climb fuel, time, and distance connect to cruise planning.
- Why a later flight needs a new preflight review of information concerning that flight, while landing remains a distinct operation using arrival weather and landing weight.
- How to account for the possible difference between calculated and actual performance without inventing an airplane-specific procedure.
Study materials and visual aids
- Private Pilot ACS — Performance and Limitations knowledge and risk management
- Density altitude chart and explanation
- PHAK Chapter 11 visual aid — Performance-chart conditions and notes
- PHAK Chapter 11 visual aid — Interpolation and sample takeoff table
Fact-check and source material
| Topic | Source type | Authoritative source | Locator | Verified |
|---|---|---|---|---|
| Appropriate airplane performance data | FAA regulatory standard | Private Pilot ACS — Performance and Limitations skill | PA.I.F.S2, printed p. 7 | 2026-08-26 |
| Airfoil reaction to moving air | FAA guidance | PHAK Chapter 4 — Airfoil Design | Airfoil Design, p. 4-6 | 2026-08-28 |
| Identifying the applicable POH or AFM | FAA guidance | PHAK Chapter 9 — AFM/POH and preliminary pages | AFM/POH and Preliminary Pages, p. 9-2 | 2026-08-27 |
| POH or AFM performance-data scope | FAA guidance | PHAK Chapter 11 — Importance of Performance Data | Introduction and Importance of Performance Data, p. 11-1 | 2026-08-26 |
| Chart formats and thin-air effects | FAA guidance | PHAK Chapter 11 — Data basis and air-density effects | Performance-data basis and air-density effects, p. 11-2 | 2026-08-26 |
| Pressure-altitude and density-altitude definitions | FAA guidance | PHAK Chapter 11 — Pressure Altitude and Density Altitude | Pressure Altitude and Density Altitude, p. 11-3 | 2026-08-26 |
| Moisture and air density | FAA guidance | PHAK Chapter 11 — Effects of Humidity on Density | Effects of Humidity on Density, p. 11-5 | 2026-08-26 |
| Angle of climb and rate of climb | FAA guidance | PHAK Chapter 11 — Angle and Rate of Climb | Angle of Climb and Rate of Climb, p. 11-7 | 2026-08-26 |
| Climb gradient and groundspeed | FAA guidance | AIM — Climb-gradient conversion and groundspeed | 5-4-21(b), Missed Approach, printed p. 5-4-58 (PDF p. 448) | 2026-08-28 |
| Indicated airspeed | FAA guidance | PHAK Chapter 8 — Indicated airspeed | Airspeed Indicator: Indicated Airspeed, p. 8-8 | 2026-08-28 |
| Calibrated, true, and groundspeed | FAA guidance | PHAK Chapter 8 — Calibrated, true, and groundspeed | Airspeed Indicator: Calibrated, True, and Groundspeed, p. 8-9 | 2026-08-28 |
| True airspeed relative to the air mass | FAA guidance | FAA Pilot/Controller Glossary — True Airspeed | Airspeed and True Airspeed entries, PCG A-12 (PDF p. 148) | 2026-08-28 |
| Weight, altitude, and configuration in climb | FAA guidance | PHAK Chapter 11 — Climb Performance Factors | Climb Performance Factors, p. 11-8 | 2026-08-26 |
| Runway surface | FAA guidance | PHAK Chapter 11 — Runway Surface | Runway Surface, p. 11-12 | 2026-08-26 |
| Runway slope effects | FAA guidance | PHAK Chapter 11 — Runway Gradient | Runway Gradient, p. 11-13 | 2026-08-27 |
| Takeoff weight and wind effects | FAA guidance | PHAK Chapter 11 — Takeoff weight and wind | Takeoff Performance: gross weight and wind, p. 11-15 | 2026-08-26 |
| Density altitude and takeoff inputs | FAA guidance | PHAK Chapter 11 — Takeoff density-altitude effects | Density-altitude effect and primary takeoff considerations, p. 11-16 | 2026-08-26 |
| Pre-takeoff prediction and density-altitude flight context | FAA guidance | AFH Chapter 6 — Prior to Takeoff | Prior to Takeoff, p. 6-1 | 2026-08-27 |
| Landing-distance inputs and density altitude | FAA guidance | PHAK Chapter 11 — Landing Performance | Landing Performance, p. 11-17 | 2026-08-26 |
| Climb fuel, time, and distance | FAA guidance | PHAK Chapter 11 — Climb and Cruise Charts | Climb and Cruise Charts, p. 11-21 | 2026-08-26 |
| Range and endurance | FAA guidance | PHAK Chapter 11 — Range and Endurance | Range Performance, p. 11-9 | 2026-08-26 |
| Cruise speed, fuel consumption, endurance, and range | FAA guidance | PHAK Chapter 11 — Cruise and Range Performance | Cruise and Range Performance and Figure 11-27, p. 11-24 | 2026-08-26 |
| Landing charts and landing weight | FAA guidance | PHAK Chapter 11 — Landing Charts | Landing Charts, p. 11-26 | 2026-08-26 |
| Airplane-specific landing information | FAA guidance | AFH Chapter 9 — Approaches and Landings | Introduction, p. 9-1 | 2026-08-27 |
| Preflight runway and performance information | Regulation | 14 CFR § 91.103 | Introductory text and paragraphs (b)(1)-(2) | 2026-08-26 |
Correction status
Corrections and source updates are recorded in the episode production log before a revised version is published. Submit a source correction through the repository issue form or email [email protected]. Do not send credentials, private documents, or personal flight information.