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Pilot/Controller Glossary

UAM

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(See URBAN AIR MOBILITY.)

UAS FACILITY MAP (UASFM)

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 Defined grid squares showing maximum altitudes around airports where
the

FAA may authorize Part 107 sUAS operations without additional safety
analysis. The maps should be consulted

prior to conducting UAS operations (Part 91, Part 107 or Section
44809) in controlled airspace. The UASFM

will aid in determining if the airspace authorization or waivers are
necessary. UASFM(s) are charted on the UAS

Data Delivery System (UDDS) at the following website address:

[1]https://faa.maps.arcgis.com/apps/webappviewer/index.html?id=9c2e4406
710048e19806ebf6a06754ad.
UAS TEST SITE

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 Independently owned UAS test & research sites, recognized by the FAA.

UAS TRAFFIC MANAGEMENT (UTM)

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The unmanned aircraft traffic management ecosystem that will

allow multiple low altitude BVLOS operations and which is separate
from, but complementary to, FAA's Air

Traffic Control System.
UASFM

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(See UAS FACILITY MAP.)

UHF

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(See ULTRAHIGH FREQUENCY.)

ULTRAHIGH FREQUENCY (UHF)

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 The frequency band between 300 and 3,000 MHz. The bank of radio

frequencies used for military air/ground voice communications. In some
instances this may go as low as

225 MHz and still be referred to as UHF.
ULTRALIGHT VEHICLE

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 A single-occupant aeronautical vehicle operated for sport or
recreational purposes

which does not require FAA registration, an airworthiness certificate,
or pilot certification. Operation of an

ultralight vehicle in certain airspace requires authorization from
ATC.

(Refer to 14 CFR Part 103.)

UNABLE

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Indicates inability to comply with a specific instruction, request, or
clearance.

UNASSOCIATED

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A radar target that does not display a data
block with flight identification and altitude

information.

(See ASSOCIATED.)

UNCONTROLLED AIRSPACE

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 Airspace in which aircraft are not subject to controlled airspace
(Class A, B,

C, D, or E) separation criteria.
UNDER THE HOOD

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 Indicates that the pilot is using a hood to restrict visibility
outside the cockpit while

simulating instrument flight. An appropriately rated pilot is required
in the other control seat while this operation

is being conducted.

(Refer to 14 CFR Part 91.)

UNFROZEN

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 The Scheduled Time of Arrival (STA) tags, which are still being
rescheduled by the time

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based

flow management (TBFM) calculations. The aircraft will remain unfrozen
until the time the corresponding

estimated time of arrival (ETA) tag passes the preset freeze horizon
for that aircraft's stream class. At this point

the automatic rescheduling will stop, and the STA becomes "frozen."
UNICOM

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 A nongovernment communication facility which may provide airport
information at certain airports.

Locations and frequencies of UNICOMs are shown on aeronautical charts
and publications.

(See CHART SUPPLEMENT.)
(Refer to AIM.)

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References

1. https://faa.maps.arcgis.com/apps/webappviewer/index.html?id=9c2e4406710048e19806ebf6a06754ad