5 - PROCEDURES114 190-00356-00 Rev GIf ATC directs you to make a change, recheck eachelement again.Points to Remember for Localizer or VOR-based Approaches• The default factory setting allows the CDI outputto automatically switch from the GPS receiver tothe LOC receiver. This may be changed to manualin some installations. If the “ILS CDI Selection” set-ting is changed to “Manual”, you must determinewhen to select “GPS” or “VLOC” guidance duringthe approach. Remember, “VLOC” is required forthe final course segment from Final Approach Fix(FAF) to MAP.NOTE: Installations with certain autopilots, suchas the KAP 140 and KFC225, do not allow auto-matic ILS CDI switching.NOTE: GPS level of service annunciations (LPV,ENR, etc.) are not applicable to the external CDI(or HSI) when VLOC is active.• If the CDI output has not automatically switchedfrom GPS to ILS upon reaching the FAF, you mustmanually switch to the VLOC receiver by pressingthe CDI key. Verify that “VLOC” is displayed directlyabove to the CDI key.• Automatic switching of CDI output is availablefor ILS, localizer, SDF and LDA approaches. Auto-matic CDI switching is not available for backcourseapproaches or VOR approaches.• When flying an approach with the autopilot coupled,you must monitor system functions at all times andverify that the autopilot and external CDI (or HSI)switch to the VLOC receiver with sufficient time tocapture and track the approach course. Switchingto “VLOC” late in the approach may not provide theautopilot enough time to respond and intercept theapproach course prior to the FAF (depending uponthe performance characteristics of your autopilot andaircraft). In such instances, you should manually flythe approach or refer to the documentation providedwith your autopilot.• When an ILS or VOR approach is first selected orexecuted, the frequency is automatically checked.If the frequency is correct, you will not receive amessage regarding the frequency. If the frequencyis incorrect, you will receive a message and youmust place the ILS or VLOC frequency in the activefrequency field.• When flying a localizer-based approach(other than backcourse) with automatic CDIswitching enabled:1. “GPS” guidance may be used while flyingoutbound and on the initial portion of theprocedure turn.2. “VLOC” guidance is used on the remainder ofthe approach from the time you turn inboundon the procedure turn.3. The localizer frequency must be active to use“VLOC” guidance at the MAP. Press the CDIkey to switch back to GPS data when themissed approach is initiated.Points to Remember
