Sigma Tek, Inc.

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Autopilot Attitude Gyroscopes

5000E/L-series

Sigma Tek, Inc.

5000E/L-series - Sigma Tek, Inc.

The 5000E air-driven attitude gyro is another variation of our standard 5000B model. It includes inductive pickoffs that generate the signals necessaryto drive an autopilot. The intuitive display has a moving horizon mask that indicates the position of the aircraft’s wings in relation to the natural horizon. This attitude information is passed along to the autopilot system.

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Breakout Box and Data Logger

1U643-001

Sigma Tek, Inc.

1U643-001 - Sigma Tek, Inc.

The 1U634 Breakout Box and Data Logger was developed for the Cessna Excel to serve as the main diagnostics tool for the aircraft?? electronic modules. It allows access to the module pins, and its internal microcomputer digitizes the signals and transmits them to a PC-compatible computer. Advanced software in the computer displays pin voltages either in numerical or graphical form. Data files can be recorded on disk, and played back at a later time for detailed analysis.

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AC Calibration Standard

1U647-001

Sigma Tek, Inc.

1U647-001 - Sigma Tek, Inc.

The 1U647-001 is a low cost calibration standard used to determine if a 1U632-100 or a 1U663-100 DMU requires factory calibration. Its portability makes it ideal for field-testing. The standard generates signals that simulate the aircraft’s resolvers, rotary variable transformers (RVTs), and linear variable displacement transformers (LVDTs). The unit also generates a pulse width modulated (PWM) signal, and routes the output of an ARINC 429 source to the different DMU input channels. The calibration standard connects directly to the DMU and replaces the output signals of an active extender card. Discrete switch settings simplify testing. The unit is housed in a rugged aluminum case.

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Standard Directional Gyroscopes

4000B-series

Sigma Tek, Inc.

4000B-series - Sigma Tek, Inc.

The 4000B is our standard air-driven directional gyro. As the aircraft turns left or right, gears on the sensing unit and dial shaft translate this rotation into rotation of the instrument’s vertical dial. Left turns produce clockwise dial rotation and right turns produce counter-clockwise rotation. The gyro is controlled by a heading selector knob located on the lower left of the instrument. Pressing and turning the knob first disengages the dial shaft and then resets the dial to a new heading, which results in a new course indication. Releasing the selector knob re-engages the dial shaft. The on-course position of the pointer is always at the top of the azimuth circle (0° on the dial with the aircraft headed north).

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Restrained Airspeeds

Sigma Tek, Inc.

Sigma Tek, Inc.

These airspeed indicators have restrained movements.These instruments are actuated by ram air and ambient atmospheric pressure obtained from the aircraft pitot and static pressure systems. A moveable pointer and a fixed dial indicate airspeed with the zero index at the 12 o’clock position. Temperature compensation is internal and there is no external zero adjustment. Pointer damping is internally adjustable.

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Altitude Gyroscopes

Sigma Tek, Inc.

Sigma Tek, Inc.

A device that uses Earth's gravity to help determine orientation.

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ARINC-style Attitude Gyroscopes

1U367-series

Sigma Tek, Inc.

1U367-series - Sigma Tek, Inc.

The 1U367 has a pictorial horizon mask and a fixed airplane. The mask moves to indicate climb, dive, and bank. Bank and pitch attitudes are diaplayed so that the pilot's sensing of the gyro's horizon indication is the same as the interpretation of the relationship between the wings of the aircraft and the natural horizon during visual flight.

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Cageable Attitude Gyroscopes

5000M-series

Sigma Tek, Inc.

5000M-series - Sigma Tek, Inc.

The 5000M is an air-driven gyro that has a pictorial horizon mask and fixed airplane. The mask moves to indicate climb, dive, and bank. Bank and pitch attitudes are displayed so that the pilot’s sensing of the gyro indication is the same as the interpretation of the relation between the wings of the aircraft and the natural horizon during visual flight.

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XYZ Bootstrap Directional Gyroscopes

4000H-series

Sigma Tek, Inc.

4000H-series - Sigma Tek, Inc.

Sigma Tek's Directional Gyro with heading synchro output provides a cost effective link to "bootstrap" other instruments requiring heading information for: display orientation to aircraft heading, heading stabilization functions, and other navigational calculations and/or solutions. Specific applications include: Argus Moving Map Display®, L-3 Avionics Stormscope®, and Insight Strike Finder®.

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Heading Reference Directional Gyroscopes

4000HR-series

Sigma Tek, Inc.

4000HR-series - Sigma Tek, Inc.

The 4000HR air-driven directional gyro offers some of the best features of our other popular models.  It inherited all of the functionality and reliability of the industry standard 4000B upon which it’s based, and it picked up a heading reference bug from the 4000C autopilot model.

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Autopilot Directional Gyroscopes

4000C/D-series

Sigma Tek, Inc.

4000C/D-series - Sigma Tek, Inc.

The 4000C/D is an air-driven directional gyro with A.C. autopilot pickoffs. Left turns produce clockwise dial rotation and right turns produce counter-clockwise rotation. Two knobs control the gyro. The left knob is used to cage the unit, and the right knob is used to select the instrument’s heading. To change course, the right selector knob is pressed and turned to disengage the dial shaft and set the pointer to a new heading. Releasing the selector knob re-engages the pointer with the dial shaft. As the aircraft turns onto a new course, the pointer returns to its original position. The on-course position of the pointer is always at the top of the azimuth circle (0° on the dial with the aircraft headed north).

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Dual Fuel Gauge

1U432-series

Sigma Tek, Inc.

1U432-series - Sigma Tek, Inc.

The 1U432 dual fuel gauge is packaged as a compact, 3” instrument. It has dual D’Arsonval movements that are driven by two resistive bulb transducers in the fuel tanks. The two opposing pointers stand out sharply from the non-reflective black background.

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Multifunction Engine Gauge

1U378-series

Sigma Tek, Inc.

1U378-series - Sigma Tek, Inc.

This 3” instrument combines the three essential engine parameters in a compact package. Rugged D’Arsonval meter movements with two jewels are used to indicate cylinder head and oil temperatures. A brass bourdon tube mechanism precisely indicates oil pressure. A selection of fittings is available to simplify installation.

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True Airspeeds

Sigma Tek, Inc.

Sigma Tek, Inc.

These true speed indicators are differential pressure indicators that measure the difference between static and total pressure produced by ram air from the pitot. The indicated airspeed can be corrected for changes in altitude by turning the knob to align the outside air temperature with the altitude. The moveable airspeed scale will then show the actual, or true, airspeed.

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Data Monitoring System

1S663-001

Sigma Tek, Inc.

1S663-001 - Sigma Tek, Inc.

The 1S663-001 Data Monitoring System was specifically developed for the Cessna Citation X and serves as the primary diagnostic tool for the aircraft?? electronic Logic Modules. The system is FAA certified for airborne operation. Aft compartment and cabin modules can be tested two at a time while remaining in place. The system is also capable of monitoring the fuel quantity system during flight.