Cessna 172SPHUSR05 Pilot Operating Handbook page 420

S ECTION 9 - SU P P LE M E NTS
S U PPLEM ENT 1 5 - FAA A P P ROVE D
7. APP ROACH
coupling on an I LS and more precise tracking on instru ment
approaches) .
a. When equ ipped with DG :
1 ) BARO setting -- CHECK (if i nstalled) .
2) OBS Knob -- SELECT desired approach cou rse. (For a
localizer, set it to serve as a memory aid .)
3) APR Mode Selector Button -- P R ESS.
annunciated.
4) Heading Selector Knob -- ROTATE BUG to agree with
desired approach.
When APR is selected , the autopilot will flash H OG for 5
seconds to rem ind the pilot to reset the H OG bug to the
approach cou rse.
APR button selection, a 45° intercept angle will then be
automatically established based on the position of the bug.
All angle i ntercepts compatible with radar vectors may be
accomplished by selecting ROL mode P R i O R to pressing
the APR button. The H OG bug m ust stil l be positioned to
agree with the desired approach course to provide course
datum to the autopilot when using a DG.
I
a) If the C O l needle is greater than 2 to 3 dots from the
center, the autopilot will annunciate APR ARM ; when
the computed captu re point is reached the ARM
annunciator will go out and the selected course will
be automatically captured and tracked.
I
b) If the COl needle is less than 2 to 3 dots form the
center, the H OG mode will disengage upon selecting
APR mode; the APR annu nciator will illuminate and
the captu re/track seq uence will automatically begin.
� 1 � ?R
(APR) COU PLING :
NOTE
If H OG mode was in use at the time of
NOTE
C ESSNA
MODEL 1 72S
(To enable glideslope
Note APR ARM