Справочник Пользователя для Garmin gns 500w

114

190-00356-00 Rev E

If ATC directs you to make a change, recheck each 
element again. 

•  The default factory setting allows the CDI output

to  automatically  switch  from  the  GPS  receiver  to 
the LOC receiver. This may be changed to manual 
in some installations. If the “ILS CDI Selection” set-
ting is changed to “Manual”, you must determine 
when to select “GPS” or “VLOC” guidance during
the approach. Remember, “VLOC” is required for
the final course segment from Final Approach Fix 
(FAF) to MAP. 

 

NOTE: Installations with certain autopilots, such 
as 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 switched 

from GPS to ILS upon reaching the FAF, you must 
manually switch to the VLOC receiver by pressing 
the CDI key. Verify that “VLOC” is displayed directly
above to the CDI key. 

•  Automatic  switching  of  CDI  output  is  available

for ILS, localizer, SDF and LDA approaches. Auto-
matic CDI switching is not available for backcourse 
approaches or VOR approaches.

•  When flying an approach with the autopilot coupled, 

you must monitor system functions at all times and 

verify that the autopilot and external CDI (or HSI)
switch to the VLOC receiver with sufficient time to
capture and track the approach course. Switching 
to “VLOC” late in the approach may not provide the
autopilot enough time to respond and intercept the 
approach course prior to the FAF (depending upon 
the performance characteristics of your autopilot and 
aircraft). In such instances, you should manually fly 
the approach or refer to the documentation provided 
with your autopilot. 

•  When an ILS or VOR approach is first selected or

executed, the frequency is automatically checked. 
If the frequency is correct, you will not receive a 
message regarding the frequency. If the frequency 
is  incorrect,  you  will  receive  a  message  and  you 
must place the ILS or VLOC frequency in the active
frequency field. 

•  When  flying  a  localizer-based  approach

(other  than  backcourse)  with  automatic  CDI  
switching enabled: 

1.   “GPS”  guidance  may  be  used  while  flying 

outbound  and  on  the  initial  portion  of  the 
procedure turn. 

2.   “VLOC” guidance is used on the remainder of 

the approach from the time you turn inbound 
on the procedure turn. 

3.   The localizer frequency must be active to use 

“VLOC” guidance at the MAP. Press the CDI 
key  to  switch  back  to  GPS  data  when  the 
missed approach is initiated. 

Points to Remember