California Airport to Receive Precision Approach Path Indicator

The $35,000 system will be installed next to the runway and provides pilots with accurate information as they prepare to land their aircraft.


Nov. 12--TRACY -- Pilots who fly into Tracy Municipal Airport soon will be seeing red -- and white.

The city is using a grant from the Federal Aviation Administration to install a Precision Approach Path Indicator system next to the airport's runway. The $35,000 system provides pilots with accurate information as they prepare to land their aircraft.

"You don't need these to land. Pilots land all the time without them," said Rod Buchanan, deputy director of Tracy parks and community services, who said the PAPI system is a safety upgrade many smaller airports would like to install.

"But they are another tool to be able to manage aircraft in the most precise manner possible."

PAPI uses four giant lights, usually mounted on the left side of a runway. Each is angled at a slightly different pitch and shines either red or white light at a pilot depending on the degree of the plane's final approach.

According to Kyle Owens, President of Sacramento-based Flight Light Inc., a pilot's preferred angle of descent is 3 degrees. If a pilot sees two white lights and no red ones on approach, the plane is coming in at too steep an angle. If the lighting is reversed, the angle is not steep enough. The optimum angle is for a pilot to see one red and one white light.

"In flying, we say, 'Red over white, pilot's delight,'"‰" he said.

To illustrate the point, Owens said motorists may see a series of red lights as they drive past Sacramento International Airport or Stockton Metropolitan Airport indicating their cars -- which are parallel to the ground -- are riding along at less than a 3 degree pitch.

"It's a significant safety device that helps pilots know their glide slope," Owens said. "Other than that, pilots don't have a lot of guidance points."

Tracy airport currently uses an older Visual Approach Slope Indicator system, or VASI, which also uses red and white lights to help pilots determine their angle of descent. But the VASI lights blend into each other to form a pink color. Owens said pilots prefer to see the two distinct lights so they know they are at the exact 3-degree angle.

Ray Schlaier, a licensed pilot and instructor, said pilots should be able to land without visual approach indicators, although the lighting systems help if a runway is sloped or has other attributes that may trick one's eyesight.

"Sometimes, you can get faked out because of the perspective, so it's better to have them than not have them," Schlaier said."

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