Sector Entry (Holding Patterns)
Overview[edit | edit source]
In aviation, sector entry refers to the specific method an aircraft uses to enter a holding pattern, which is a predetermined maneuver to delay aircraft while awaiting further clearance from air traffic control. The three main types of sector entries are direct, parallel, and teardrop.
Sector Entry Types[edit | edit source]
Direct Entry[edit | edit source]
The most straightforward entry, where the aircraft flies directly to the holding fix and then turns to join the outbound leg.
Parallel Entry[edit | edit source]
Involves overflying the holding fix and then turning to a heading parallel to the outbound course for one minute, before turning to join the inbound course.
Teardrop Entry[edit | edit source]
Starts by overflying the holding fix and then turning 30 degrees from the outbound leg, flying outbound for one minute, and then turning to intercept the inbound course.
Historical Context[edit | edit source]
Early Days[edit | edit source]
Holding patterns were initially simple, with pilots using basic maneuvers to delay aircraft.
Development[edit | edit source]
As air traffic grew, more standardized holding procedures and entry methods were developed to ensure efficiency and safety.
Modern Practice[edit | edit source]
Today, holding patterns and sector entry methods are well-defined and regulated, with specific procedures for different aircraft types and airspace conditions.
Purpose[edit | edit source]
Holding patterns are used to manage traffic congestion, delays due to weather, or runway unavailability.
Air Traffic Control[edit | edit source]
Air traffic controllers use holding patterns to ensure safe and efficient air traffic flow, and they are responsible for assigning holding patterns to aircraft.