Cessna 172SPHUSR05 Pilot Operating Handbook page 422

S ECTION 9 - S U PPLEM E NTS
S U P PLEM ENT 1 5 - FAA APPROVE D
When R EV is selected , the autopilot will flash H OG for 5
seconds to remind the pilot to reset the H OG bug to the
localizer FRONT COU RS E I NBOU N D heading.
mode was in use at the time of REV button selection , a 45°
intercept angle will then be automatically established based
on the position of the bug.
All angle intercepts compatible with radar vectors may be
accomplished by selecting ROL mode P R I OR to pressing
the R EV button. The H OG bug must still be positioned to
the localizer FRONT COU RS E I N BOU N D heading to
provide cou rse datum to the autopilot when using a DG .
I
a) If the C O l needle is greater than 2 to 3 dots from
center, the autopilot wil l annunciate R EV
the computed capture point is reached the ARM
annunciator will go out and the selected back course
will be automatically captu red and tracked.
I
b) If the C O l needle is less than 2 to 3 dots from center,
the H OG mode will disengage upon selecting REV
mode; the REV annunciator will illuminate and the
capture/track sequence will automatically begi n .
b. When equipped with H S I :
1 ) BARO Setting (if installed) - - CHECK.
2) Course Bearing pointer -- SET to the I LS front course
inbound heading.
3) Heading Selector Knob -- SET BUG to provide desired
intercept angle and engage HOG mode.
4) R EV Mode Selector Button -- PRESS.
S 1 5-30
NOTE
NOTE
C ESSNA
MOD EL 1 72S
If heading
when
ARM ;
Revision 3