Piper Dakota PA-28-236 Pilot Operating Handbook page 289

PIPER AIRCRAFT CORPORATION
PA-28-236, DAKOTA
Figure 7-1 (cont)
6. PREFLIGHT TEST (TEST) BUTTON - When momentarily pushed,
initiates preflight test sequence which automatically turns on all
annunciator lights, tests the roll rate monitor, checks the manual trim
drive voltage, checks the manual electric trim monitor and tests all
autopilot valid and dump logic. If the preflight is, successfully passed,
the AP annunciator light will flash for approximately 6 seconds
(an aural tone will also sound simultaneously with the annunciator
flashes). The autopilot cannot be engaged until the preflight test is
successfully passed.
7. 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:
8. 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. 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.
9. 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.
10. 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.
ISSUED: JULY 23, 1982
SECTION 9
SUPPLEMENT 8
REPORT: VB-910
9-39