Instrument Approach Procedures and Navigation Systems Quiz

Aviation Terminology

• The term "Threshold Elevation" refers to the elevation of the highest point of the landing area.
• The purpose of an Airborne Collision Avoidance System (ACAS) is to provide alerts and instructions to pilots to avoid potential collisions with other aircraft.

Aerodromes

• An alternate aerodrome is a designated airport that an aircraft can divert to in case of an emergency or other unforeseen circumstances.

Departure Routes

• A Standard Instrument Departure (SID) is a defined instrument flight rule (IFR) departure route.

Altitudes

• The Minimum Obstacle Clearance Altitude (MOCA) is the lowest altitude that will provide a minimum clearance of 300 m (1,000 ft) above all objects located in an arc of a circle defined by a 46 km (25 NM) radius.
• The Decision Altitude (DA) or Decision Height (DH) is the lowest altitude above which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

Runway Operations

• The Threshold is the beginning of that portion of the runway usable for landing.

Navigation

• A Waypoint is a specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation.
• Dead Reckoning is a technique for estimating or determining position by advancing an earlier known position by the application of direction, time, and speed data.

Airspace

• An Air Traffic Control Zone is an airspace of defined dimensions within which air traffic control service is provided in accordance with the airspace classification.

Approach Procedures

• Continuous Descent Final Approach (CDFA) is a technique for flying the final approach segment of a non-precision instrument approach procedure as a continuous descent, without level-off, from an altitude/height at or above the final approach fix altitude/height to a point approximately 15 m (50 ft) above the landing runway threshold or the point where the flare maneuver should begin for the type of aircraft flown.
• Type A instrument approach procedures are designed for 3D instrument approach operations.
• The purpose of an intermediate fix (IF) in RNAV applications is to provide a checkpoint for ensuring the aircraft is on the correct course.

Obstacles

• Obstacle Clearance Altitude (OCA) is the minimum altitude for a defined segment that provides the required obstacle clearance.
• The purpose of an obstacle assessment surface (OAS) is to evaluate the terrain and obstacles in the vicinity of an aerodrome to ensure safe aircraft operations.

Holding Procedures

• The purpose of a holding procedure is to delay an aircraft in flight, typically in a designated holding area, to ensure safe separation from other aircraft.

Approach Types

• A Non-Precision Approach (NPA) procedure is an approach that does not provide vertical guidance to the pilot, whereas an Approach Procedure with Vertical Guidance (APV) provides both lateral and vertical guidance to the pilot.