TERMINAL

6-13 TERMINAL AREA PROCEDURES
a.
USE OF GREEN ANTI-COLLISION LIGHTS BY USN/USMC AIRCRAFT - USN/USMC aircraft have been authorized to display green anti-collision light(s) for the purpose of identifying aircraft involved in aerial refueling Operations. When displayed, subject anti-collision light(s) will be used in conjunction with standard position lights.

b.
ILS CRITICAL AREAS - Erratic Instrument Landing System signals may occur when aircraft and/or vehicles are located near the Glide Slope or localizer antennas. When landing or departing aircraft pass over the antennas, the signal may also be temporarily affected. When interference occurs, it can adversely affect aircraft flying a coupled (Instrument Landing System signal tied in with the aircraft autopilot) or autoland Instrument Landing System approach. Aircrews need to advise the Air Traffic Control agency, prior to reaching the FAF (Final Approach Fix), when a coupled or autoland approach is being conducted. Air traffic controllers will furnish safety advisories to these aircraft when aircraft or vehicles are in or over the designated Instrument Landing System critical area. The phraseology used by the controller will be: “Localizer/Glide signal not protected.”

c.  VISUAL APPROACH SLOPE INDICATOR
(1)
The Visual Approach Slope Indicator (VASI), is designed to provide by visual reference the same information that the Glide Slope unit of an Instrument Landing System provides electrically. If the VASI Glide Slope is flown with correct power settings and airspeed, touchdown will be made in the normal touchdown area.

(2)
The VASI is aligned to provide a Visual Glide Slope of 2.5 degrees to 3 degrees from horizontal. A 2.5 degree Glide Slope will be 266 feet at a distance of 1.0 nautical miles, and 1329 feet at a distance of 5.0 nautical miles. A 3 degree Glide Slope will be 318 feet at a distance of 1.0 nautical miles, and 1593 feet at a distance of 5.0 nautical miles. Only the Final Approach Course and Transition Areas are protected for Obstruction Clearance.

(3)
The VASI Glide Slope is normally aligned to coincide with the Instrument Landing System and Precision Approach Radar Glide Slope, where these facilities are located on the same runway. In cases where the Glide Slope angles differ, deviations will be shown in the applicable Enroute Supplement under "Service."

(4)
In order to conduct a VASI approach, align the aircraft with the runway or runway lights approximately 250-300 feet elevation for each mile distance from the airport. When the Glide Path is intercepted the pilot will see the near bars as white, and the far bars as red. A position below the Glide Path will cause both bars to be red, and a high position will cause both bars to be white. A departure from the Glide Path is indicated to the pilot by a transition in color from red through pink to white (high) or vice versa (low). The lights are arranged so that the pilot will see the following:

(a)
Standard Federal Aviation Administration 2-Bar VASI

1  Above Glide Path White White White White
2  On Glide Path Red Red White White
3  Below Glide Path Red Red Red Red
(b)  3-Bar VASI
1  Above both Glide Paths White White White White White White
2  On upwind Glide Path Red Red White White White White
3  On downwind Glide Path Red Red Red Red White White
4  Below both Glide Paths Red Red Red Red Red Red
(5) The intensity of VASI at civil facilities can be adjusted by the controller at pilots request. USAF Installations are automatically adjusted by a photo-electric cell. USAF/USN VASI lights remain on continuously except where a hazard is created by this condition. Such conditions will be included in the appropriate listing in the Enroute Supplement.

(6) Tri-color visual Approach Indicators have been
　
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