Airport reference point (ARP): identify the correct statements about its definition, mapping reference, and use in defining horizontal and conical surfaces.

Question

Solve this multiple-choice question and choose the correct option.

Curioustab · Accepted Answer

Introduction / Context:The Airport Reference Point (ARP) is a fundamental datum in aerodrome planning. It provides a single geodetic point used for identifying the aerodrome on maps and for referencing certain obstacle limitation surfaces. Given Data / Assumptions: ARP approximates the geometric centre of the usable landing area (aerodrome proper). Horizontal and conical surface boundaries in obstacle limitation systems are referenced to the ARP. Map depictions of an aerodrome often position the symbol at the ARP. Concept / Approach:Because an aerodrome can have multiple runways and complex geometry, a single reference (ARP) simplifies cartographic representation and regulatory descriptions of protected airspace surfaces (e.g., horizontal and conical surfaces encircling the aerodrome planform). Step-by-Step Solution: 1) Definition: The ARP is the approximate geometric centre of the landing area—statement 1 is correct.2) OLS referencing: Horizontal and conical surfaces use the ARP as their plan reference—statement 2 is correct.3) Mapping: The official position of the airport shown on charts is the ARP—statement 3 is correct. Verification / Alternative check: Review aerodrome chart legends and OLS diagrams; ARP coordinates are explicitly listed and used. Why Other Options Are Wrong: a/b/c/e: Each omits one or more true statements, whereas all three are correct together. Common Pitfalls: Confusing ARP with runway threshold coordinates or with the airport reference elevation (different concepts). Final Answer: All of the statements (1–3) are correct.

Airport reference point (ARP): identify the correct statements about its definition, mapping reference, and use in defining horizontal and conical surfaces.

Answer

Explanation