TM 1-1510-218-10 3B-55 Table 3B-4.  Methods of Operation OBS METHOD OF OPERATION SENSOR BLEND VOR TACAN OMEGA MODE RNV ENR RNV ENR RNV ENR RNV ENR RNV APR RNV APR NAV NAV AUTO/LEG METHOD OF OPERATION SENSOR BLEND VOR TACAN OMEGA MODE RNV ENR RNV ENR RNV ENR RNV ENR RNV APR* RNV APR* * Automatic navaid selection does not occur when operating the system in AUTO/LEG, VOR or TACAN, RNV APR.  The pilot must specify a reference navaid for each waypoint in the reference name field of each waypoint page.  This reference navaid is the  particular navaid which the VOR navigation receiver and DME will be turned to when this waypoint is activated. q.    Shutdown Procedure. 1.   ON   /   OFF   rocker   switch   –  Press  lower half. r. Emergency  Procedures.     If  the  KNS-660 system  information  is  intermittent  or  lost,  secure  the system and utilize the remaining operational navigation equipment as required. 1.   FMS/NAV   CTL   switch   –   Press.      Verify NAV CTL illuminated. 2.   CDU ON / OFF switch – Off. 3.   FMS circuit breaker – Pull. Section IV.  RADAR AND TRANSPONDER 3B-27.  PILOT'S ALTIMETER. a.    Description.        The    altimeter    provides    a servoed counter drum/pointer display of barometrically corrected  pressure  altitude  derived  from  the  air  data system.      Refer   to   Figure   3B-19.      The   barometric pressure   is   set   manually   with   the   baro   knob   and displayed  in  units  of  inches  mercury  and  millibars  on baro  counters.    The  altimeter  is  ac  powered  and  is protected through a 1-ampere circuit breaker, placarded PILOT ALTM  (AC) located on the overhead circuit breaker panel, Figure 2-16, Sheet 3.