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Pilot's Handbook of Aeronautical Knowledge



Table of Contents

Chapter 1, Introduction To Flying
Chapter 2, Aircraft Structure
Chapter 3, Principles of Flight
Chapter 4, Aerodynamics of Flight
Chapter 5, Flight Controls
Chapter 6, Aircraft Systems
Chapter 7, Flight Instruments
Chapter 8, Flight Manuals and Other Documents
Chapter 9, Weight and Balance
Chapter 10, Aircraft Performance
Chapter 11, Weather Theory
Chapter 12, Aviation Weather Services
Chapter 13, Airport Operation
Chapter 14, Airspace
Chapter 15, Navigation
Chapter 16, Aeromedical Factors
Chapter 17, Aeronautical Decision Making




N2. Rotational speed of the high pressure compressor in a
turbine engine.

Nacelle. A streamlined enclosure on an aircraft in which
an engine is mounted. On multiengine propeller-driven
airplanes, the nacelle is normally mounted on the leading
edge of the wing.

NACG. See National Aeronautical Charting Group.

NAS. See National Airspace System.

National Airspace System (NAS). The common network of
United States airspace—air navigation facilities, equipment
and services, airports or landing areas; aeronautical charts,
information and services; rules, regulations and procedures,
technical information; and manpower and material.

National Aeronautical Charting Group (NACG). A
Federal agency operating under the FAA, responsible for
publishing charts such as the terminal procedures and en
route charts.

National Route Program (NRP). A set of rules and
procedures designed to increase the flexibility of user flight
planning within published guidelines.

National Security Area (NSA). Areas consisting of airspace of
defined vertical and lateral dimensions established at locations
where there is a requirement for increased security and safety
of ground facilities. Pilots are requested to voluntarily avoid
flying through the depicted NSA. When it is necessary to
provide a greater level of security and safety, flight in NSAs
may be temporarily prohibited. Regulatory prohibitions are
disseminated via NOTAMs.

National Transportation Safety Board (NTSB). A United
States Government independent organization responsible for
investigations of accidents involving aviation, highways,
waterways, pipelines, and railroads in the United States.

NTSB is charged by congress to investigate every civil
aviation accident in the United States.

NAVAID. Navigational aid.

NAV/COM. Navigation and communication radio.

NDB. See nondirectional radio beacon.

Negative static stability. The initial tendency of an aircraft
to continue away from the original state of equilibrium after
being disturbed.

Neutral static stability. The initial tendency of an aircraft
to remain in a new condition after its equilibrium has been

NM. Nautical mile.

NOAA. National Oceanic and Atmospheric Administration.

No-gyro approach. A radar approach that may be used in
case of a malfunctioning gyro-compass or directional gyro.
Instead of providing the pilot with headings to be flown,
the controller observes the radar track and issues control
instructions "turn right/left" or "stop turn," as appropriate.

Nondirectional radio beacon (NDB). A ground-based radio
transmitter that transmits radio energy in all directions.

Nonprecision approach. A standard instrument approach
procedure in which only horizontal guidance is provided.
No procedure turn (NoPT). Term used with the appropriate
course and altitude to denote that the procedure turn is not

NoPT. See no procedure turn.

NOTAM. See Notice to Airmen.
Notice to Airmen (NOTAM). A notice filed with an aviation
authority to alert aircraft pilots of any hazards en route or at
a specific location. The authority in turn provides means of
disseminating relevant NOTAMs to pilots.

NRP. See National Route Program.

NSA. See National Security Area.

NTSB. See National Transportation Safety Board.

NWS. National Weather Service.
Obstacle departure procedures (ODP). A preplanned
instrument flight rule (IFR) departure procedure printed for
pilot use in textual or graphic form to provide obstruction
clearance via the least onerous route from the terminal area to
the appropriate en route structure. ODPs are recommended
for obstruction clearance and may be flown without ATC
clearance unless an alternate departure procedure (SID or
radar vector) has been specifically assigned by ATC.
Obstruction lights. Lights that can be found both on and off
an airport to identify obstructions.