Piper PA-28-236 DAKOTA, Pilot Operating Handbook

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PIPER AIRCRAFT CORPORATION SECTION 9
PA-28-236, DAKOTA SUPPLEMENT 11
ISSUED: OCTOBER 14, 1986 REPORT: VB-910
9-93
GS mode activation (GS capture) is. indicated by the active
pitch mode annunciator extinguishing, leaving only the GS
annunciator lighted. Since GS mode activation results from a
combination of position and rate information, GS capture will
probably occur before the GS needle centers in such a manner
that the transition on to the GS centerline will be anticipated
and therefore, very smooth.
After GS capture, loss of valid GS signal will cause the
GS annunciator to flash. Also selection of HDG, NAV or
REV mode will cause GS to flash, indicating an inconsistent
GS tracking condition. APR mode must be selected while
tracking glide slope.
The GS mode may be deactivated by selection of any other
pitch mode (ATT, ALT), however, automatic reactivation is
possible from any pitch mode if APR mode is selected.
NOTE
If valid glide slope data is lost after coupling,
the autopilot will NOT automatically decouple,
however the GS light will flash. The pilot must
monitor raw course guidance data during the
approach to assure signal quality.
Since GS arm and capture are automatic when the arming
and capture sequence is met, the GS must be locked out
for holding operations on the localizer at the L.O.M. When
localizer holding is desired, localizer tracking must be
performed in NAV mode which will offer the same tracking
dynamics as APR mode but will inhibit GS arm and capture.
When APR clearance is received, select APR mode for
completion of the approach.
(2) Selected Angle Intercepts - If an H.S.I. type heading system
is installed, selected angle intercepts may be made during
VOR or localizer inteicept situations by selecting HDG and
NAV, HDG and APR, or HDG and REV, simultaneously,
as appropriate. During a selected angle intercept operation,
the autopilot will follow the heading bug until reaching the
computed On Course Turn Point at which time capture is
indicated by extinguishing of the