Piper PA-28-161 Pilot Operating Handbook page 237

SECTION 9
SUPPLEMENT 7
Figure 7-1 (cont)
PIPER AIRCRAFT CORPORATION
PA-28·161, WARRIOR II
8. BACK COURSE APPROACH (BC) MODE SELECTOR
BUTTON -When pushed, will select the Back Course Approach
mode. This mode functions identically to the approach mode except
that response to LOC signals is reversed. Glide slope coupling is
inhibited in the Back Course Approach mode.
9. APPROACH (APR) MODE SELECTOR BUTTON - When
pushed, will select the Approach mode. This mode provides all
angle intercept (with HSI) or a fixed angle intercept of 45° (with
DG), automatic beam capture and tracking of VOR, RNA V or.
LOC signals plus glide slope coupling in the case of an lLS. The
tracking gain of the APR mode is greater than the gain in the N A V
mode. The APR annunciator will flash until the automatic capture
sequence is initiated.
10. NAVIGATION (NAY) MODE SELECTOR BUTTON - When
pushed, will select the Navigation mode. The mode provides all
angle intercept (with HSI) or a fixed angle intercept of 45° (with
DG), automatic beam capture and tracking of VOR, RNAV or
LOC signals. The NAY annunciator will flash until the automatic
capture sequence is initiated.
11. HEADING (.HOG) MODE SELECTOR BUTTON - When
pushed, will select the Heading mode, which commands the air-
plane to turn to and maintain the heading selected by the heading
bug on the DG or HSI. A new heading may be selected at any time
and will result in the airplane turning to the new heading with a
maximum bank angle of about 20°. Selecting HOG mode will
cancel NAV, APR or BC track modes.
12. ALTITUDE HOLD (ALT) MODE SELECTOR BUTTON -
When pushed, will select the Altitude Hold mode, which commands
the airplane to maintain the pressure altitude existing at the
moment of selection. Engagement may be accomplished in climb,
descent, or level flight. In the APR mode, altitude hold will auto-
matically disengage when the glide slope is captured.
13. FLIGHT DIRECTOR (FD) MODE SELECTOR BUTTON -
When pushed, will select the Flight Director mode (with KC 292
Autopilot Computer only), bringing the Command Bar in view on
the KI 256 and will command wings level and pitch attitude hold.
The FD mode must be selected prior to Autopilot engagement.
14. VERTICAL TRIM CONTROL- A spring loaded to center rvckcr
switch which will provide up or down·pitch command changes: while
in AL T will adjust altitude at rate of about 500 fpm; when not in AL T
will adjust pitch attitude at a rate of. 7 degj sec. Will cancel GS couple.
The aircraft must pass through the glide slope again to allow GS
recouple.
REPORT: VB-1180
ISSUED: AUGUST 13, 1982
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