A to Z of Aviation Terminology - (E)

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The Electronic Flight Instrument System (EFIS) is a modern flight display system used in many aircraft to provide the flight crew with information about the aircraft's flight and navigation status. EFIS systems use electronic displays, such as liquid crystal displays (LCDs) or cathode ray tubes (CRTs), to present flight information, replacing traditional mechanical instruments such as gyroscopic attitude indicators, airspeed indicators, and altimeters.

EFIS systems typically consist of a primary flight display (PFD), which displays flight information such as attitude, airspeed, altitude, and heading, and a navigation display (ND), which displays navigation information such as the aircraft's position on a moving map, flight plan information, and traffic information.

EFIS systems provide a number of benefits over traditional mechanical instruments, including improved reliability, increased accuracy, and reduced weight and maintenance costs. Additionally, EFIS systems can be customized to display the information that is most relevant to the flight crew, and can be easily updated with new software or data as required.

Overall, EFIS systems have become an essential component of modern aircraft, providing the flight crew with real-time information about the aircraft's flight and navigation status, and enabling more efficient and effective flight operations.
An elevator is a movable control surface on the tail of an aircraft that controls the pitch, or angle of attack, of the aircraft's wings. The elevator works by changing the angle of the tail of the aircraft, which in turn changes the amount of lift generated by the wings.

When the pilot wants to raise the nose of the aircraft, he or she moves the control column (or yoke) forward, which deflects the elevator upward. This increases the angle of attack of the wings, generating more lift and causing the nose of the aircraft to rise. Conversely, when the pilot wants to lower the nose of the aircraft, he or she moves the control column back, which deflects the elevator downward, reducing the angle of attack of the wings and causing the nose of the aircraft to drop.

The elevator is a critical component of an aircraft's flight control system, as it allows the pilot to control the aircraft's pitch and maintain level flight or climb or descend as desired. It is typically located on the horizontal stabilizer at the rear of the aircraft's fuselage, and is operated by cables, hydraulic actuators, or a combination of the two.

Overall, the elevator is an essential component of an aircraft's ability to fly, as it enables the pilot to control the aircraft's pitch and maintain safe and stable flight.
An Emergency Location Transmitter (ELT) is a device installed on an aircraft that transmits a distress signal in the event of an emergency. The ELT is activated by the impact of a crash, or manually by the flight crew, and sends a signal on the international distress frequency of 406 MHz.

The ELT signal is picked up by satellites in the international Cospas-Sarsat satellite system, which provides worldwide coverage for distress signals. The signal provides information on the location of the aircraft, helping rescue teams to find the wreckage and provide assistance to survivors.

ELTs are mandatory on many types of aircraft and are required by international aviation regulations. There are two main types of ELTs: the older 121.5 MHz ELT, which has limited range and is being phased out, and the newer 406 MHz ELT, which has a stronger signal and provides more accurate location information.

In addition to ELTs, many aircraft are also equipped with other types of emergency location systems, such as Emergency Position Indicating Radio Beacons (EPIRBs) and Personal Locator Beacons (PLBs), which provide similar functions for use outside of the aircraft.

Overall, ELTs are an important component of aviation safety, providing a critical link between an aircraft in distress and the rescue teams that are tasked with finding and assisting survivors.
An "empty leg" in aviation refers to a private jet flight that is scheduled to fly without any passengers on board, either because it was chartered one-way and the return flight is empty or because it was a positioning flight to reposition the aircraft for the next charter. These flights are often sold at a reduced rate to offset the cost of the flight for the operator, making them an affordable option for individuals or companies looking for private jet travel.
The Enhanced Ground Proximity Warning System (EGPWS) is a computer-based system that provides flight crews with advanced warning of potential terrain and obstacle threats during flight. It is designed to enhance situational awareness and reduce the risk of controlled flight into terrain (CFIT) accidents.

EGPWS uses onboard data such as the aircraft's GPS position, altitude, and flight plan, along with digital terrain and obstacle data, to calculate the aircraft's position relative to the ground and to identify potential threats. If the aircraft is in danger of a terrain or obstacle impact, the system sounds an audible warning and displays a visual alert to the flight crew.

EGPWS provides several key features and functions, including:

Terrain Awareness and Warning System (TAWS), which provides alerts and warnings based on the aircraft's proximity to terrain and obstacles Windshear Detection and Alerting, which provides warnings of windshear conditions and helps the flight crew avoid windshear-related accidents Runway Awareness and Advisory System (RAAS), which provides alerts and warnings related to the approach and landing phases of flight, including incorrect runway configurations and over-run situations. EGPWS has become a standard feature on many commercial aircraft, and has been credited with reducing the number of CFIT accidents in recent years.

Overall, EGPWS is a critical component of modern aviation safety systems, providing flight crews with advanced warning of potential terrain and obstacle threats and helping to reduce the risk of accidents.
Executive jet charter refers to the rental or leasing of a private jet for individual or corporate use. Executive jet charter provides passengers with a high level of comfort, convenience, and privacy, as well as the flexibility to travel on their own schedule and to destinations not served by commercial airlines.

Executive jet charter services typically cater to business executives, high-net-worth individuals, and other individuals or organizations that require the use of a private jet for their travel needs. These jets come in a variety of sizes and configurations, ranging from light jets for short flights to long-range jets for intercontinental travel.

When using an executive jet charter service, customers have the ability to choose their own aircraft and customize their flight arrangements, including the departure and arrival times, the route, and the catering options. This allows them to plan their travel around their own schedule and to minimize the time spent on the ground.

Executive jet charter services also offer benefits such as shorter check-in times, private terminals, and the ability to fly into smaller airports closer to the final destination.

Overall, executive jet charter provides an attractive alternative to commercial air travel for those who value comfort, privacy, and flexibility, and who are willing to pay a premium for these benefits.

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