7.23. Course Intercepts. See FAA-H-8083-15B for course intercept procedures with an HSI. See Figure 7.1 and Figure 7.2 for examples with T-6 instrumentation.

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7.23.1. Objective. Intercept a radial inbound or outbound from a station.

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7.23.2. Description. Turns to intercept specific courses to comply with published or assigned departure, enroute, or arrival routing.

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7.23.3. Procedures. See FAA-H-8083-15B for course intercept procedures with an HSI. See Figure 7.1 and Figure 7.2 for examples with T-6 instrumentation.

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7.23.4. Technique.

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7.23.4.1. Set the heading bug on the intercept heading. Lead points are dependent on the CDI rate of movement and turn radius.

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7.23.4.2. To intercept a course inbound, “Charlie Brown plus 30, not to exceed 90” is a common memory aid. Start at the course arrow (Charlie) on the EHSI, move up the case to the bearing pointer (Brown), and finally continue 30 degrees past the bearing pointer to identify the intercept heading. Ensure the TO/FROM indicator indicates “TO” on the EHSI.

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7.23.4.3. To intercept a course outbound, “Top Cat plus 45, not to exceed the head of the bearing pointer” is a common memory aid. Start on the tail of the bearing pointer (Top), move up the case to the course arrow (Cat), and finally continue 45 degrees past the course arrow, but not to exceed the head of the bearing pointer, to identify the intercept heading. Bird’s-eye-view awareness of aircraft location in relation to the NAVAID (radial/DME) as well as the desired radial to be intercepted will serve as a check that the chosen intercept heading makes sense. Ensure the TO/FROM indicator indicates “FROM” on the EHSI.

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7.23.4.4. To maintain a course and correct for winds, divide the crosswind component of the wind by the true airspeed in NM/min. For example, if flying at 240 KTAS (4 NM/min) with 40 knots of crosswind, approximately 10 degrees of drift correction (40 knots/4 NM/min) into the wind is required to maintain a course.

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Figure 7.1. Inbound Course Intercepts. Illustrated clearance: “TAHOE 45, Intercept the Randolph 210 Radial Inbound.” The desired radial is210, and the illustrated EHSI course selection is CRS 030 for the reciprocal inbound course. The illustrated path converges on radial 210 and proceeds toward the station. This transcription captures the clearance/course-selection relation; it does not transcribe every incidental display value.

Figure 7.1 (PDF p. 137)

Figure 7.2. Outbound Course Intercepts (Away from the Station). Illustrated clearance: “TAHOE 45, Intercept the Randolph 010 Radial Outbound.” The initial illustrated course selection is CRS 020 on the aircraft’s starting radial; after the new clearance the desired course selection is CRS 010. The illustrated path intercepts radial 010 and proceeds away from the station. This transcription captures the clearance/course-selection relation; it does not transcribe every incidental display value.

Figure 7.2 (PDF p. 138)