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Regulations Flight Section 3231- Orientation: Radio Loop System 1. Tune in the radio range signal and identify the Station being received by both the station identification signal and the frequency dial setting, rotating the loop for best reception. 2. After identifying the Station, determine Station location, using the following procedure: (a) Set WHITE pointer on Azimuth scale to 0-180. (b) Turn airplane until a null is heard (c) Note compass course, then change course of air-plane 90 degrees to left by making a 90 degree precision turn (d) Upon completing turn set WHITE pointer on Azimuth scale to 90-270. (e) Follow this new course heading and rotate loop until null is heard. (f) Continue course heading and follow the null of the Station by rotating the loop clockwise of counter-clockwise. (g) If pointer rotation is CLOCKWISE the Station is to the RIGHT. If pointer rotation is COUNTER-CLOCKWISE the Station is to the LEFT. (h) Reset the WHITE pointer on Azimuth scale to 0-180, turn the air-pane toward the Station until null is heard, then follow the null toward the Station. 3. If location of Station is definitely known and orientation is not necessary, set the WHITE pointer on the Azimuth scale to 0-180 for homing and follow the null toward the Station. 4. The loop system is particularly adaptable for orientation homing and bearings, and all Captains and First Officers should be fully familiar with its uses. 5. Do not use the loop antenna for instrument approaches. Switch to standard antenna to check for build-up of signal and for cone of silence. 6/20/39 Flight