Airport Highlights 2004 0401 - Laserfiche WebLink

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• • • ADVANTAGES FOR HAVING an ILS on BOTH RUNWAYS 27R and 27L Due to the Bay Area's good weather, the majority of arrivals into North Field are visual approaches by general aviation propeller aircraft into Runway 27R. This is not expected to change regardless of where an ILS is located. Having two ILS capabilities on North Field would not increase the North Field's arrival capacity. Runways 27R and 27L are only 1000 feet apart and, therefore, too close to allow for simultaneous operations. In addition, separation between IFR (instrument flight rules) aircraft on either one or both ILS approaches would be the same as if there were only one approach and one runway. For example, an IFR arrival on Runway 27L would have to be 3 miles behind a preceding IFR arrival on Runway 27R. Other factors such as wake turbulence separation rules and the use of visual separation could also apply, depending on the type aircraft and weather conditions. Non - precision instrument approaches exist today on 27L and would continue to exist for 27R if the ILS were removed from that runway. • ♦ Back -up — The primary advantage of having two ILS systems is back -up. If one ILS were to fail, or one runway was closed due to maintenance or emergency, the other could be used as a replacement and there would still be a precision approach to North Field, which enhances safety. Two is always preferable to a single thread system. • Flexibility - Air Traffic could use either ILS system with regard to runway length and tower traffic pattern (touch and go operations) preferences. • Touch and Go operations could occur on either runway. If the ILS is eliminated from 27R and installed. on 27L, touch and go (T &G) activity would generally occur on 27R because all instrument/IFR approaches would land on 27L. Due to aircraft performance and differing pilot skill levels, it is often preferable to separate IFR arrivals from T &G operations. Shifting this pattern would put a large number of T &G traffic (approximately 100 or more arrivals per day) over the Davis West and Timothy Drive neighborhoods. During busy periods of arriving flights, the T &G pattem would likely extend farther out over residential areas because the T &G's would have to be sequenced with normal VFR arrivals to 27R from the north and east. Please see the enclosed printout, illustrating a typical T &G pattern on 27L. If these operations were to occur on 27R, it is likely that many would overfly the Davis West and Timothy neighborhoods, especially if they were sequenced in with other VFR arrivals to 27R. • Preferential use for general aviation arrivals on 27R during the day and 27L at night. 27L would always be the preferred arrival runway for air carrier operations, when Runway 11/29 is closed for emergencies or •