USArmy-ApacheLongbow

ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
TM 1-1520-251-10
WARNING
The terrain profiling mode of the FCR
shall not be relied upon for primary pilotage
information.
4.41.3 FCR Terrain Profiles. Terrain clearance is accomplished
using the TPM. It is a ground scan mode used
to provide pilotage information to either the pilot /CPG. It
provides an FCR sector ground clearance plane format
displayed (fig 4-53) on an MPD or ORT display which is
used in conjunction with a terrain profiles format displayed
with IHADSS video.
WARNING
Low radar cross section objects such as
telephone or power poles or isolated
leafless trees cannot be accurately measured
by the FCR. The clearance plane
should be set to exceed the height of all
anticipated hazards.
BLACK SAFE
TO FLY
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
DARK GREY
SOME RISK
LIGHT GRAY
UNKNOWN
WHITE
HAZARDOUS
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
OBSTACL
E
20, 50, 100, 200 FT
PRESENT ALTITUDE
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
CLEARANCE PLANE
ÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓÓ
LBA2585
Figure 4-53.
FCR Terrain Profiles
a. Clearance Planes. Options of 20, 50, 100, or
200 feet below the helicopter wheels are available for
selection. Four shades of gray will be displayed to represent
terrain information as follows:
• LIGHT GRAY represents unknown terrain. Terrain
has areas in radar shadow or areas where
sufficiently accurate measurements CANNOT be
made. This can occur in a ring near the radar or in
a ring where ground cannot be reached at the
radar slant range. A light gray area without a
characteristic shadow edge can be an indication of
heavy rain or low reflectivity terrain. The FCR is
capable of detecting and reporting heavy rain.
However, there is no discrete symbology for this
information.
• DARK GRAY represents an area that is potentially
hazardous and does not guarantee the expected
clearance. Terrain measured is between the
helicopter present altitude and the clearance
plane. Flying into a dark gray area presents some
risk depending on TADS/PNVS video quality.
• BLACK represents terrain measured below the
selected clearance plane.
• WHITE represents a hazardous area that must be
avoided. Terrain measured is above the helicopter
wheel height.
Use or disclosure of this information is subject to the restriction(s) on the title page of this document.
4-52