UNS-1Ew | SBAS-Flight Management System

  • Overview
  • Capabilities
  • Features
  • Specifications
  • Additional Images

The UNS-1Ew features a self-contained design which includes control/display functions and the Navigation Computer Unit (NCU) with integral GPS/SBAS receiver. The system includes a graphics- and video-capable 5-inch diagonal display with a housing depth of approximately 9 inches.

A special package version, the UNS-1Espw has a reduced depth and includes the same features with the exception that it is an all-digital system only. The UNS-1Espw is ideal for applications where console or panel depth pose an integration challenge. Analog Roll steering and discretes are included with the UNS-1Espw.

Certified on Over 50 Aircraft Types

Universal Avionics specializes in flight deck upgrades, providing flexible options for over 50 aircraft types, ranging from the Pilatus PC-12 to the Boeing 747.

Avionics for you, your aircraft and the way you fly - Universal Avionics.

Platform for NextGen and SESAR

The avionics systems you invest in today must be able to support the Next Generation of Communication, Navigation, Surveillance / Air Traffic Management (CNS/ATM). They must possess the processing power, speed, memory and interface capabilities to meet the growing demands of the US Next Generation Air Transportation System (NextGen) and Europe’s Single European Sky ATM Research (SESAR).

Since introducing the industry’s first multi-sensor FMS (the UNS-1) in 1982, Universal Avionics has continually taken the industry forward with a pilot-focused vision of flight management. Today’s SBAS-capable FMSs build upon the company’s popular marketproven product design, offering more advanced features and interfaces, and a growth path to meet the requirements of the future.

NextGen Benefits

  • Improved Safety with SBAS
  • Precision-Area Navigation with RNP, RNAV & LPV
  • Accurate Positioning with ADS-B Out
  • Future Air Navigation System (FANS) Capability

High-Integrity Navigation

Universal Avionics’ SBAS-capable FMS features an extremely precise, internal SBAS Global Positioning System (GPS) receiver that improves accuracy and integrity of GPS-derived position information. The Receiver Autonomous Integrity Monitor (RAIM) prediction requirements in US airspace are thereby removed and navigation capabilities for all classes of aircraft in all phases of flight are increased.

The embedded SBAS GPS receiver provides ILS-like guidance down to near CAT I ILS minimums.

In addition, Universal Avionics’ SBAS-FMS meets stringent internal monitoring requirements to provide guidance to any of the Minimum Descent Altitude (MDA) levels for Area Navigation (RNAV) (GPS) approach guidance:

  • Localizer Performance with Vertical (LPV)
  • Lateral Navigation/Vertical Navigation (LNAV/VNAV)
  • LNAV-Only
  • Approach Procedures with Vertical (APV)

Universal Avionics’ SBAS-FMS is compatible with the regional SBAS around the world:

  • Europe – European Geostationary Navigation Overlay Service (EGNOS)
  • North America – Wide Area Augmentation System (WAAS)
  • Japan – Multi-functional Satellite Augmentation System (MSAS)
  • India – GPS-Aided Geo-Augmented Navigation (GAGAN)

FMS Flight Planning

FMS Flight Planning The Flight Planning (FPL) function provides you with the quickest, most efficient means of creating a flight plan, and the most pilot-friendly method of altering the flight plan elements as desired or required by ATC. It has been engineered to incorporate the greatest level of safety, with numerous built-in safeguards such as the entry of list-referenced selections which reduce both keystrokes and errors.

Off-Line Flight Planning

The Universal Flight Planning (UFP) Windows based software provides you with off-line flight planning, GPS Fault Detection, and Exclusion prediction capabilities.
Learn more and download the Universal Flight Planning (UFP) Program.


PerformanceThe UNS-1Ew and UNS-1Fw SBAS-FMSs provide a Performance (PERF) option for select aircraft types for which performance charts from the Airplane Flight Manual (AFM) are digitized and stored in memory. These FMSs will use pertinent data such as GW, ALT, OAT, etc., to provide exact values for V1, VR and V2, along with Takeoff N1.

Fuel Management

Fuel ManagementUsing inputs from the fuel flow sensors, the SBAS-FMS provides real-time fuel management with the most extensive fuel information and calculations available – the kind that can eliminate unnecessary fuel stops, save you time and money and provide increased safety. Specific range and endurance are provided along with fuel, time and distance predictions for your destination.


ListsThe unique LIST function provides a quick and efficient means to access and enter data, minimizing alphanumeric entries and reducing input errors. The “smart” lists are geographically prioritized based on aircraft position and course, then alphabetized on each page. You can quickly enter airports, navaids, intersections and airways all by simply entering the list reference number corresponding to the data desired.

Data Management

Navigation Data ManagementThe DATA function key provides access to a variety of navigation data management capabilities. Easy access to your stored navigation database for detailed review of SIDs, STARs, approaches, runways, airways, intersections, navaids and airports. Your pilot-defined database can be accessed and edited, allowing you to create new or modify your pre-defined departures, arrivals, approaches, runways, airports, waypoints, alignment points and stored routes. Your non-editable company route database can be accessed as well.


NavigationThe SBAS-FMS will fly all procedural leg types in accordance with ARINC 424. This sophisticated capability allows you to fly the most complex procedures such as heading to altitude, precision arc, procedure turn, holding pattern and more – all the necessary maneuvers required to accurately fly SIDs, STARs and approaches.


Dirct-ToThe Direct-To (DTO) function key is specifically dedicated for flight plan changes in response to “Direct-To” clearances. The SBAS-FMS easily takes you from your present position direct to any point on or off your flight plan using circular arc steering. If the desired waypoint is on the flight plan, it may be selected by entering its list reference number. If the desired waypoint is not on the flight plan, the LIST function can be used to access other waypoints/airports within the surrounding area from the database, or the identifier can be manually entered into the field.

Vertical Navigation

Vertical NavigationUniversal Avionics’ SBAS-FMSs incorporate the most advanced concepts in vertical guidance and control. VNAV pages provide for such features as computed Top-Of-Descent, Target Vertical Speed indication and selection, and Vertical Direct-To commands. Vertical waypoints can be conveniently defined with altitudes or Flight Levels, and lateral offsets.

Frequency Management

Frequency ManagementFrequency management capabilities allow you to tune your NAV and COMM radios through the SBASFMS – completely interfaced with your existing Radio Management Unit. The SBAS-FMS presents a list of suggested COMM, Nav and NDB frequencies pre-selected based on aircraft position and phase of flight. Additionally, you can customize the radios tuned through the SBAS-FMS by storing an “active” and up to four “preselect” frequencies. A “recall” feature allows you to swap the active with the last frequency tuned without affecting the preselect frequencies.


MessagesAn extensive library of messages has been programmed into the SBAS-FMS. The message annunciator alerts you of system status advisories, including way- point alerts, sensor watchdog functions, TAWS alerts and self-test. “Pop-up” messages in response to invalid entries further simplify system operation. The Message (MSG) key may also be used to access datalink communications should this optional equipment be installed.

Holding Patterns

Holding patterns are accurately flown through the SBAS-FMS automatically, complete with appropriate entry procedure: direct, parallel or teardrop. The navigation database includes holding patterns that are part of departure, arrival, approach and missed approach procedures. The aircraft will fly the normal flight plan legs and then automatically enter the holding pattern upon reaching the holding fix. You may also manually define a holding pattern by specifying the holding fix, inbound course, turn direction and either time or distance of holding leg. When armed, the holding pattern will be entered automatically upon reaching the fix. A DTO HOLD command is also provided to enable you to go direct to a holding fix at any time.


Once near your destination, you can easily link the appropriate approach for the active runway into your flight plan. Approaches and runways from the navigation database, and those which have been pilot defined, are easily accessed.

Display and User Control

Display and user control is provided through the 4-inch or 5-inch FPCDU. A Multi-functional Control Display Unit (MCDU) is specially tailored for airline or special mission operations. Universal’s FPCDUs feature graphics capabilities and incorporate the latest technology in Active Matrix Liquid Crystal color Displays (AMLCD). They feature the highest contrast, lowest reflection and greatest horizontal and vertical viewing angles available, and offer superb sunlight readability. Unique parallax control is also provided. The system uses two character sizes and line graphics to enhance data recognition.

Night Vision Goggle-Compatible

Universal Avionics’ 4-inch and 5-inch FPCDUs are modified with Night Vision Goggle (NVG)- compatible glass display panels, which changes the lighting output in such a way that the unit can be used in flight decks where operators are wearing night vision goggles.

Flat Panel Color Displays (integral/CDU)

Internal 12-channel GPS/SBAS

TSO-C146c, Class Gamma-3
FDE prediction program for remote/oceanic ops

Company Routes Database

Up to 2,000 routes, 200 company waypoints and 100 company airports

Clearance-language format

Navigation Database

SID/STAR procedures
Plain-language references

ARINC 424 procedural leg guidance

Heading Mode


Fully coupled
Computed top-of-descent
Target vertical speed
Vertical Direct-To

Holding Patterns

Included in Navigation Database
Manually defined

3-D Approach Mode

Laterally coupled
Vertically coupled

Fuel Management

4 Fuel flow inputs

Take Off/Landing (excluding UNS-1Lw)

Frequency Management

UniLink Compatible

Weather graphics
Text Messaging

TAWS Compatible

TAWS graphics

Universal Cockpit Display Compatible

SCAT-I GPS Approach Compatible

SBAS Planned Growth

LAAS Planned Growth




Size: 6.38 in. H x 5.75 in. W x 8.98 in. D
Weight: 8.0 lbs.
Mounting: ¼ turn Dzus Fasteners
Control/Display: Integral 5-inch color Flat Panel Display

Standard Interfaces

All Digital Configuration, Digital & Analog Configuration, ASCB Version A Configuration
8 Inputs/4 Outputs (Digital & Analog) 16 Inputs/8 Outputs (All Digital)


Primary Input: 28 VDC standard
Lighting: 5 or 28 VDC
Consumption: 78 Watts max.
Cooling: Convection

Internal SBAS/GPS Receiver

12-Channel Satellite Tracking Engine, TSO-C146c, Class Gamma-3, FDE Prediction Program for Remote/Oceanic Ops


C109, C115b, C146c, C190, JTSO C115b




Size: 6.38 in. H x 5.75 in. W x 7.62 in. D
Weight: 7.2 lbs.
Mounting: ¼ turn Dzus Fasteners
Control/Display: Integral 5-inch color Flat Panel Display

Standard Interfaces

All Digital Configuration
8 Inputs/5 Outputs


Primary Input: 28 VDC standard
Lighting: 5 or 28 VDC
Consumption: 78 Watts max.
Cooling: Convection

Internal SBAS/GPS Receiver

12-Channel Satellite Tracking Engine, TSO-C146c, Class Gamma-3, FDE Prediction Program for Remote/Oceanic Ops


C109, C115b, C146c, C190, JTSO C115b

System Architecture

SBAS-FMS Architecture
  • Flight Plan Page
    Flight Plan Page
  • Nav Page
    Nav Page
  • 3-D Approach Page
    3-D Approach Page
  • Fuel Page
    Fuel Page
  • Performance Page
    Performance Page
  • Data Page
    Data Page
  • List Page
    List Page
  • Tune Page
    Tune Page
  • Message Page
    Message Page
  • UniLink Menu
    UniLink® Menu
  • UniLink Menu
    UniLink® Menu
  • UniLink Flight Information
    UniLink® Flight Information
  • Direct-To Page
    Direct-To Page
  • VNAV Page
    VNAV Page
  • Holding Pattern
    Holding Pattern