AP.I.B.K7

From the FAA library

• Pilot's Handbook of Aeronautical Knowledgep. 8-6
  Chapter 8: Flight Instruments › Types of Altitude

  Indicated altitude—read directly from the altimeter (uncorrected) when it is set to the current altimeter setting. 2. True altitude—the vertical distance of the aircraft above sea level—the actual altitude. It is often expressed as feet above mean ... level (MSL). Airport, terrain, and obstacle elevations on aeronautical charts are true altitudes. 3. Absolute altitude—the vertical distance of an aircraft above the terrain, or above ground level (AGL). 4. Pressure altitude—the altitude indicated when the altimeter setting…

• Pilot's Handbook of Aeronautical Knowledgep. 8-6
  Chapter 8: Flight Instruments › Altimeter Operation

  altimeter indicates an altitude above the actual field elevation. If the barometric pressure setting is reset to the current altimeter setting of 29.68 "Hg, then the field elevation is again indicated on the altimeter. This pressure change ... easily noticed in flight since aircraft fly at specific altitudes. The aircraft steadily decreases true altitude while the altimeter is held constant through pilot action as discussed in the previous section. Knowing the aircraft’s altitude is vitally important…

• Pilot's Handbook of Aeronautical Knowledgep. 11-11
  Chapter 11: Aircraft Performance › Climb Performance Factors › Range Performance

  NOTE: The straight line that is tangent to the sea level power curve is also tangent to the altitude power curve. The effect of altitude on specific range can also be appreciated from the previous relationships. If a change ... altitude causes identical changes in speed and power required, the proportion of speed to power required would be unchanged. The fact implies that the specific range of a propeller-driven aircraft would be unaffected by altitude. Actually, this is true…

• Pilot's Handbook of Aeronautical Knowledgep. 11-3
  Chapter 11: Aircraft Performance › Density Altitude

  Density Altitude The more appropriate term for correlating aerodynamic performance in the nonstandard atmosphere is density altitude—the altitude in the standard atmosphere corresponding to a particular value of air density. Density altitude is pressure altitude corrected for nonstandard temperature ... density of the air increases (lower density altitude), aircraft performance increases. Conversely, as air density decreases (higher density altitude), aircraft performance decreases. A decrease in air density means a high density altitude; an increase in air density means a lower…

• Pilot's Handbook of Aeronautical Knowledgep. 11-6
  Chapter 11: Aircraft Performance › Performance › Climb Performance

  Positive climb performance occurs when an aircraft gains PE by increasing altitude. Two basic factors, or a combination of the two factors, contribute to positive climb performance in most aircraft: 1. The aircraft climbs (gains PE) using excess power above ... that required to maintain level flight, or 2. The aircraft climbs by converting airspeed (KE) to altitude (PE). As an example of factor 1 above, an aircraft with an engine capable of producing 200 horsepower (at a given altitude…

• 14 CFR Part 91 — General Operating and Flight RulesOpen
  14 CFR Part 91, Appendix G to Part 91—Operations in Reduced Vertical Separation Minimum (RVSM) Airspace

  Part 91—Operations in Reduced Vertical Separation Minimum (RVSM) Airspace An RVSM flight envelope includes the range of Mach number, weight divided by atmospheric pressure ratio, and altitudes over which an aircraft is approved to be operated in cruising flight ... RVSM flight envelopes are defined as follows: (a) The full RVSM flight envelope is bounded as follows: (1) The altitude flight envelope extends from FL 290 upward to the lowest altitude of the following: (i) FL 410 (the RVSM altitude…