TM 1-1520-240-MTF4-523. HSI and Magnetic Compass.a. HSI synchronized.b. Magnetic compass$5_ of HSI.c. 2_maximum difference between pilot andcopilot indicators.4. VOR.a. Tuning, reception, and volume.b. HSI MODE SELECT panel — VOR SEL andCMD SEL engaged and lit.c. HSI MODE SELECT panel — VOR ADFengaged and lit.d. No. 2 pointer on HSI $3_ of correctmagnetic course to station.e. Note course direction on HSI.(1) Centered when on selected VORcourse.(2) 10_off-course gives full deviation bardisplacement.f. Station passage.g. Total No. 2 pointer fluctuation 5_.h. VOR frequency — Tune to 108.00 MHz.(1) VOR/MB TEST switch — Press andhold.(2) On both, HSI, note TO arrow in view, thedeviation bar deflects within the $2 dotdeflection and NAV warning flags areconcealed.(3) Note all three marker beacon lights lit onHSI MODE SELECT panel.(4) Release TEST switch and return VORto operational frequency.
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