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Nonprecision operations are conducted using. To a localizer but is not part of a complete ILS. The LDA course usually provides a more precise approach course than the similar Simplified Directional Facility (SDF) installation, which may have a course width of 6 or 12 degrees.Īlignment does not exceed 30 degrees between the course and runway. Circling minimums only are published where this alignment exceeds 30 degrees.Īlso incorporate a glideslope. These are annotated in the plan view of the instrument approach chart with a note, “LDA/Glideslope.” These procedures fall under a newly defined category of approaches called Approach with Vertical Guidance (APV) described in paragraph 5Ĭharts, subparagraph a7(b), Approach with Vertical Guidance (APV). Very high frequency (VHF) omnidirectional range (VOR), non-directional radio beacon (NDB), LDA, Localizer (LOC), Localizer back course (LOC-BC), RNAV, LNAV minimums or initial RNAV distance measuring equipment (DME)-DME approaches), and airport surveillance radar (ASR) approaches are examples of NPAs. The LDA is of comparable use and accuracy Service Volume (SSV) localizer. All charted procedures with localizer coverage beyond the 18 NM SSV have been through the approval process for Expanded Service Volume (ESV), and have been validated by flight inspection. (See FIG 1 These areas. ATC may clear aircraft on procedures beyond the service volume when the controller initiates the action or when the pilot requests, and radar monitoring is provided.
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