SECTION 9
PIPER AIRCRAFT CORPORATION
SUPPLEMENT 9
PA-28-236, DAKOTA
REPORT: VB-910
ISSUED: JULY 23, 1982
9-62
Figure 7-1 (cont)
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, RNAV or
LOC signals plus glide slope coupling in the case of an ILS. The
tracking gain of the APR mode is greater than the gain in the NAV
mode. The APR annunciator will flash until the automatic capture
sequence is initiated.
10. NAVIGATION (NAV) 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 NAV annunciator will flash until the automatic
capture sequence is initiated.
11. HEADING (HDG) MODE SELECTOR BUTTON - When
pushed, will select the Heading mode, which commands the
airplane 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 HDG 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
automatically 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 rocker
switch which will provide up or down pitch command changes:
while in ALT will adjust altitude at rate of about 500 fpm; when
not in ALT will adjust pitch attitude at a rate of. 7 deg/ sec. Will
cancel GS couple. The aircraft must pass through the glide slope
again to allow GS recouple,
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