Trutrak Flight Systems

Trutrak Digital Autopilots represents the greatest advance in General Aviation autopilot technology since the invention of the Century III Autopilot in 1965.

The Trutrak autopilot can be defined as an orthogonal rate system. The gyroscopic rate sensors are installed so as to sense motion about each of the major axes (roll, yaw, and pitch). These sensors generate the fast signal responses necessary to create an autopilot with the best possible dynamic performance.

Flying an airplane well about the roll-axis requires the velocity of aileron movement be directly proportional to rate of roll for small movement. Aileron position corrections should not lag behind the motion of the aircraft. Aileron control systems that use a turn coordinator cannot do this. In turbulence, yaw disturbances can cause undesirable aileron movement, sometimes so severe that controls may even momentarily move in the wrong direction. The challenge at Trutrak is to create autopilot systems with the best dynamic performance available – systems that do not need to be disengaged in turbulence.

The complete Trutrak flight control system combines within a single panel-mounted programmer/computer package, all the electronic and sensing elements needed for roll and pitch functions and interfaces to a rate-gyro controlled yaw damper.

Basic directional control is provided by digital selection of a GPS track to be flown, eliminating drift and crosswind correction, items that need attention with DG type systems. In the GPS NAV mode of operation, the system responds to digital guidance information (GPS steering).

The vertical portion of the system contains a digital altimeter and associated altitude selector capable of selection in increments as small as 50 feet. Altitude transitions can be made by either airspeed or vertical speed selection. If an upward vertical speed is selected beyond the capability of the aircraft, the aircraft will not stall. Instead, the Trutrak autopilot will cause the aircraft to climb at a preset minimum safe airspeed. This is the only known system to provide this safety feature.

For use in Experimental Aircraft only.

EFIS Autopilots

Part No.	PHOTO	Description	CART	Price
TT EFIS API-L		EFIS Autopilot I Low Bright Display	ADD	$5300.00
TT EFIS API-H		EFIS Autopilot I High Bright Display	ADD	$5800.00
TT EFIS APII-L		EFIS Autopilot II Low Bright Display	ADD	$6700.00
TT EFIS APII-H		EFIS Autopilot II High Bright Display	ADD	$7200.00
TT EFIS APIII-L		EFIS Autopilot III Low Bright Display	ADD	$7200.00
TT EFIS APIII-H		EFIS Autopilot III High Bright Display	ADD	$7700.00
TT EFIS APIV-L		EFIS Autopilot IV Low Bright Display	ADD	$8900.00
TT EFIS APIV-H		EFIS Autopilot IV High Bright Display	ADD	$9400.00

- Specify mounting type at time of order -

Diagonal Corner	Front Mount	Avionics Stack

Single Axis
EFIS AP I	GPS-Slaved Solid State DG Digital Ground track Selector GPS Nav Mode Control Wheel Steering
Dual Axis
EFIS AP II	All the features of the EFIS AP I plus Altitude Hold
EFIS AP III	All the features of the EFIS AP II plus Climb and descend on vertical speed Trim sensing pitch servo that annuciates need for trim Altitude selector
EFIS AP IV	All the features of the EFIS AP III plus GPS Steering V-NAV GPSV - Vertical GPS Steering

All Models are available with optional ultra bright displays

Consider first the pitch display. Motion of the pitch display short term is gyroscopic as it must be to fly in IMC. Long term it is VSI. This display has two distinct advantages, the first being that it provides an instantaneous vertical speed presentation. The second is that when the reference airplane is on the horizon the aircraft is neither climbing nor descending. This eliminates the need for adjusting the position of the pitch reference airplane to compensate for the angle the fuselage is flying. The resulting benefit of the concept is that it makes holding altitude easier.

The HSI is placed below the horizon as in the larger more expensive displays. It is in the form of an ellipse for two reasons. First, an ellipse when compared with a circle of the height provides a broader scale at the top where it is read. Second, it looks as a circle would when laid out on the ground ahead of the aircraft. The boldness of the high quality display in combination with its location enhances the flyability of the overall instrument.

The analog presentations of airspeed and altitude are based on the belief that round is better. It will be noted that after having tried other presentations the automobile industry is back to round instruments. Nothing in the modern world of vertical tapes compares with the dynamic effect of a round altimeter dial rotating about a fixed pointer. As a target altitude is approached it is natural for the pilot to slow the needle velocity so as to arrive at the altitude without overshoot.

Within the bank angle scale, indicators are inserted, which show the angle for a standard rate turn. These indicators move outward on the bank angle scale as airspeed increases. Placed above the bank angle scale is an inclinometer that looks just like a conventional ball in a curved tube.

Still another convenient feature is the optional presentation of important engine data, in the pilot’s direct field of vision, displayed across the top of the instrument.

A flight director is standard even in the basic flight instrument. Like our autopilots, when the power setting is not sufficient to comply with altitude or vertical speed commands, the flight director transitions to an airspeed mode in which airspeed is held at or above a minimum value pre-set to the specific aircraft. The result is the highest level of safety.

The automatic arrival transition is also included in every EFIS. This is a feature that will help even the experienced pilot when approaching an unfamiliar airport. To initiate the arrival transition click CRS – set the HSI course pointer to the selected runway direction – press APPR – using the flight director or autopilot, fly the arrival path to the selected runway. This will work from any direction.

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AP 100

Part No.	PHOTO	Description	CART	Price
TT AP100 AS		AP100 Two Servo Autopilot, TruTrak	ADD	$6500.00

• GPS-Slaved solid-state DG
• Digital Ground Track Selector
• VOR / LOC / ILS
• VOR / LOC Reverse
• Selected-angle Intercept
• GPS Nav Mode
• GPS Steering
• Solid-state gyroscopically-controlled pitch axis
• Selected Vertical Speed climbs and descents
• Vertical GPS Steering (GPSV)
• Altitude Hold
• True Control Wheel Steering†
• 12-28 Volts
• Dimensions - 1.7”H x 6.25”W x 7”D
• Standard weight including servos - 7lb

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ADI Pilot II

Part No.	PHOTO	Description	CART	Price
TT ADI PILOT II		ADI Pilot II Attitude Direction Indicator, TruTrak	ADD	$3850.00

• GPS-Slaved solid-state DG
• Digital Ground Track Selector
• GPS Nav Mode
• True Control Wheel Steering
• Altitude Hold
• Altitude adjust for baro change
• Built-in ADI
• Bank angle is instantaneous gyro data.
• Pitch is gyro enhanced vertical speed.
• Direction is an electronic DG showing track.
• Extreme bank angle is enunciated by flashing red arrows which indicate required stick motion to correct unusual attitude.
• Low airspeed warning is enunciated by flashing A-S on the display.
• 12-28 volts
• 3-1/8” Dimensions - 3.4” H x 3.4” W x 4.7” D
• Standard weight including servos - 6lb

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DIGITRAK SINGLE-SERVO AUTOPILOT

Part No.	PHOTO	Description	CART	Price
TT DIGITRAK		Digitrak Single Servo Autopilot, 2 1/4" Cutout, 12V	ADD	$1650.00
TT DIGITRAK 28V		Digitrak Single Servo Autopilot, 2 1/4" Cutout, 28V	ADD	$1775.00
TT DIGITRK3		Digitrak Single Servo Autopilot, 3 1/8" Cutout, 12V	ADD	$1700.00
TT DIGITRK3 28V		Digitrak Single Servo Autopilot, 3 1/8" Cutout, 28V	ADD	$1825.00

Now Available in 12V or 28V Units

• Built-in Digital Slaved Gyro
• Digital Heading Selector
• Outstanding Performance in Turbulence (Far better than turn coordinator based systems)
• Fits a Standard 2 1/4" Instrument Cut Out or 3 1/8" cut-out
• All Solid-State Sensors
• Lighter Weight Than Any Comparable System
• Simple Installations
• GPS Nav Mode
• Only external input required is GPS RS-232 (Aviation format or NMEA 0183)
• True Control Wheel Steering*

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DIGITFLIGHT-II TWO SERVO AUTOPILOT

Part No.	PHOTO	Description	CART	Price
TT DG FLT 2		Digitflight-II Two Servo Autopilot, TruTrak	ADD	$3690.00

Uses standard 2.25" Round Instrument hole 2.5"h x 2.5" w x 7"d Built-in Digital Slaved Directional Gyro Digital Heading Selector Best Dynamic Performance Available (Equal to that of the highest-priced position autopilots) Simple Intuitive User interface All Solid-State Sensors

The only Completely Digital System Lighter and Smaller than Comparable Systems Simple Installations GPS Steering (GPSS) Option additional $375 GPS Nav Mode Only external input required is GPS RS-232 (Aviation format or NMEA 0183) True Control Wheel Steering*

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DIGIFLIGHT-IIVS TWO SERVO AUTOPILOT

Part No.	PHOTO	Description	CART	Price
TT DG FLT 2VS		Digiflight-IIVS Two Servo Autopilot, TruTrak	ADD	$4100.00

All Digiflight-II Features Plus Climb and Descend on Vertical Speed Trim Sensing Pitch Servo that Annunciates for Trim 2.5" h x 2.5" w x 7" d

Optional: Lateral GPS Steering (GPSS) Option Failsafe Automatic Pitch Trim Option

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DIGIFLIGHT-II VS TWO SERVO AUTOPILOT

Programmed for Flight Design Light Sport Aircraft

Part No.	PHOTO	Description	CART	Price
TT CT PIL II VS		Digiflight-IIVS Two Servo Autopilot for Flight Design Light Sport Aircraft, TruTrak	ADD	$4250.00

Fits Standard 2.25” Round Instrument Hole Optional Flat Pack Mounting Built-in Digital Slaved Directional Gyro Digital Track Selector GPS Nav Mode Altitude Hold Simple Intuitive User Interface All Solid-State Sensors Climb and Descend on Vertical Speed

Trim Sensing Pitch Servo that Annunciates for Trim Lighter and Smaller than Comparable Systems True Control Wheel Steering† 12-28 volts Dimensions - 2.5”H x 2.5”W x 5.5”D Flat Pack Dimensions – 1.6” H x 4.3” W x 5.5” D Standard weight including servos - 6lb

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DIGIFLIGHT-IIVSGV TWO SERVO AUTOPILOT

Part No.	PHOTO	Description	CART	Price
TT DG FLT 2VS GV		Digiflight-IIVSGV Two servo Autopilot, TruTrak	ADD	$4900.00

All Digiflight-IIVS Features plus Lateral GPS Steering (GPSS) Standard Vertical GPS Steering (GPSV) Standard

TruTrak is the Only Company Offering GPSV 2.5" h x 2.5" w x 7" d

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SORCERER AUTOPILOT

Part No.	PHOTO	Description	CART	Price
TT SORCERER		Sorcerer Autopilot, TruTrak	ADD	$8800.00

GPS-Slaved solid-state DG Digital Ground Track Selector VOR/ LOC/ ILS VOR/LOC Reverse Selected-angle Intercept GPS Nav Mode GPS Steering Solid-state gyroscopically-controlled pitch axis True Control Wheel Steering Simplified User Interface 12-28 Volts

Selected Vertical Speed climbs and descents Altitude Hold Built-in Digital Altimeter V-NAV Vertical GPS Steering Altitude Selecotr with 50-ft resolution for approaches Selectable airspeed for altitude transitions (in addition to VS) Dimensions: 1.7" x 6.25"w x 7"d Standard weight including servos: 7 lbs.

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Pictorial Turn Coordinator

Part No.	PHOTO	Description	CART	Price
TT PIC TB		Pictorial Turn Coordinator 2 1/4", TruTrak	ADD	$490.00

This display is like a horizon in roll and actually moves in unison with the horizon. This makes the transition from viewing the horizon much easier than the reverse display of a standard turn coordinator. For much greater life and reliability it uses a solid state gyro instead of a spinning disc.

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PICTORIAL PILOT

Part No.	PHOTO	Description	CART	Price
TT PICTRIAL PIL		Pictorial Pilot Autopilot 2 1/4", TruTrak	ADD	$2050.00
TT PIC PIL 3		Pictorial Pilot Autopilot 3 1/8", TruTrak	ADD	$2100.00

This autopilot combines the superb performance of our Digitrak with a real aircraft flight instrument, the pictorial turn coordinator. It also contains a digital DG for viewing when the AP is not engaged. When the AP is engaged this display becomes the heading selector.

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ADI ATTITUDE DIRECTION INDICATOR............$1060.00

Part No.	PHOTO	Description	CART	Price
TT ADI		ADI Attitude Direction Indicator, TruTrak	ADD	$1060.00

Bank angle is instantaneous gyro data pitch is gyro enhanced vertical speed direction is an electronic DG showing track. Internally this gyroscopic instrument has two sizes. The larger (3 1/8") instrument is designed to be the primary flight instrument in the budget panel, while the smaller (2 1/4") is to be a backup in an EFIS equipped panel.

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