Piper ARCHER III Pilot Operating Handbook page 210

SECTION 7
DESCRIPTION & OPERATION
Multi-Function Display (continued)
Terrain Proximity (continued)
OPS alLitude, whicb is derived from satellite position and therefore may differ
from baro-corrected altitude read from the altimeter, is converted to mean sea
level (MSL)-based altitude (GPS-MSL altitude) and is used in conjunction with
OPS position to calculate and predict the aircraft's flight path in relation to the
surrounding terrain and obstacles, whose altitudes are also referenced to MSL.
System Status:
Terrain Proximity requires the following components to operate properly:
• valid 3-D OPS position
•
valid terrain/obstacle database
If Terrain Proximity does not have a valid 3-D OPS position a yellow "No
OPS Position" text will be displayed at the center of the Terrain Proximity
Page and on the PFD inset map if terrain is selected. If there is not a valid
terrain/obstacle database, the system will not display the yellow and red
colors associated with the offending obstacles and terrain.
Operation of Terrain Proximity:
Terrain is displayed on the following pages:
• Navigation Map Page
• Terrain Proximity Page
• Trip Planning Page
• Flight Plan Page
• PFD Inset Map
To display terrain data on maps other than the Terrain Proximity page,
select the MAP softkey (select lNSET softkey for the PFD inset map) on the
Navigation Map Page and then select the TERRAIN softkey. When Terrain
Proximjty is selected on maps other than the Terrain Proximity Page, an
icon to indicate the feature is enabled for display and a legend for Terrain
Proximjty colors are shown.
REPORT: VB-2749
7-24
PA-28-181, ARCHER III
ISSUED: December 22, 2017
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