ENSTROM 480B RFM SUPPLEMENT
1-1
FAA Approved: Jul 2/14
Report No. 28-AC-062
Jun 5/14
CHAPTER 1. OPERATING LIMITATIONS
1-1. General
1. The weather information displayed is limited to
supplemental use only and may not be used in lieu of
an official weather data source.
2. The GDL 69AH must utilize software version 4.02 or
later FAA approved version.
3. Because of the time required to detect, assemble and
distribute the NEXRAD weather product, the displayed
weather information contained within the product may
be significantly older than the current radar synopsis
and may not depict the current weather conditions.
The NEXRAD weather product should never be used
as a basis for making decisions to maneuver in, near,
or around areas of hazardous weather regardless of
the information it contains.
4. NEXRAD radar images may have certain limitations:
NEXRAD base reflectivity does not provide sufficient
information to determine cloud layers or
precipitation characteristics (wet hail vs. rain). For
example, it is not possible to distinguish between wet
snow, wet hail, and rain.
NEXRAD base reflectivity is sampled at the minimum
antenna elevation angle. An individual NEXRAD site
cannot depict high altitude storms at close ranges. It
has no information about storms directly over the
site.
When zoomed in to a range of 30 nm, each square
block on the display represents an area of four
square kilometers. The intensity level reflected by
each square represents the highest level of NEXRAD
data sampled within the area.
Unknown precipitation below 52ºN is displayed as
rain regardless of actual precipitation type.
This electronic document is not linked to a subscription for revision control or distribution. Refer to the Optional Equipment
Supplement Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revision
level of this Rotorcraft Flight Manual Supplement.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
