All posts tagged 'ILS'

Chicago O'Hare gets first RNP approach

Chicago’s O’Hare airport recently implemented its first RNP (required navigation performance) instrument approach. The satellite-based precision approach is part of the new generation of GPS approaches popping up at airports around the nation and the world. Chris Baur, president and CEO of Hughes Aerospace, the company that developed the approach, told the Aviation Examiner David W. Thornton on Wednesday that the new approach is an environmentally friendly alternative to current land-based approaches.

Instrument approaches are the procedures used by pilots to locate the landing runway when the weather precludes a visual approach. At large airports like O’Hare (KORD), the typical method of tracking to the runway involves an ILS (instrument landing system) approach. ILS approaches use land-based transmitters to send signals to the pilots that bring the airplanes to the touchdown point on the runway both laterally (with a localizer) and vertically (with a glideslope). This requires two separate transmitter facilities for each runway that utilizes an ILS. This can be cost-prohibitive for small airports.

RNP approaches utilize satellite navigation technology instead of ground-based navigational facilities. The aircraft’s flight management computer is programmed to fly a predetermined course along a series of waypoints, locations on a map that do not have to coincide with any geographic feature, toward the runway. Because the airplane is following GPS waypoints, approaches can easily be planned to avoid terrain features or noise sensitive areas. They can also be developed over water where land-based facilities are impractical. At some airports, RNP approaches even follow a curved path to the runway using RF (radius to fix) segments, such as this approach at Atlanta’s Peachtree-DeKalb airport (KPDK).

Check out the rest of the David W. Thornton’s story here!

The Importance of WAAS with LPV

Mark Wilken – Director of Avionics Sales with Elliott Aviation
www.elliottaviation.com

Traditionally, ground-based landing systems have been the only method for low visibility approaches. Many business aircraft, however, are operated from airports without ground-based systems and are restricted to using non-precision approaches. If your aircraft is equipped with WAAS and LPV you have many more options to get to where you are going safely and efficiently.

There is a common misconception in the industry that WAAS and LPV are one in the same, however, they are two completely different systems.

WAAS, or Wide Area Augmentation System, was developed by the FAA to augment GPS to improve accuracy. Put simply, it is a corrected GPS. It is accurate to about one meter of your actual position. Combined with LPV, it can get you into more airports in a more direct manner. Without LPV, WAAS is just nothing more than an accurate sensor.

LPV, or Localizer Performance with Vertical Guidance, gives you an enhanced database in your FMS GPS and allows ILS-like approaches at airports that do not have an ILS or ground-based system. LPV approaches allow for minimums to be as low as 200 feet.

If LPV approaches are not available at the airport you are traveling, they likely have LP approaches available. LP, or Localizer Performance Approaches, provide precision lateral guidance using the enhanced accuracy WAAS provides. As an example, an LP approach into Telluride, Colorado allow for minims of an additional 460 feet for days when the weather is less than perfect.

Mark Wilken is the Director of Avionics Sales for Elliott Aviation which employs over 40 avionics technicians at their headquarters in Moline, IL. Mark began his career at Elliott Aviation in 1989 as a bench technician repairing radios and quickly became the manager of the department. Mark helped launch Elliott Aviation’s Garmin G1000 retrofit program where the company has installed more King Air G1000’s than all other dealers in the world combined. Recently, he has headed STC programs for the newly-launched Aircell ATG 2000 system for Hawker 8000/850/900, Phenom 300 and King Air 350/B200/B200GT. Mark is a licensed pilot and holds an associate’s degree in avionics and a bachelor’s degree in aviation management from Southern Illinois University.

Elliott Aviation is a second-generation, family-owned business aviation company offering a complete menu of high quality products and services including aircraft sales, avionics service & installations, aircraft maintenance, accessory repair & overhaul, paint and interior, charter and aircraft management. Serving the business aviation industry nationally and internationally, they have facilities in Moline, IL, Des Moines, IA, and Minneapolis, MN. The company is a member of the Pinnacle Air Network, National Business Aviation Association (NBAA), National Air Transportation Association (NATA), and National Aircraft Resale Association (NARA).

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