To Next PageTo Next PageWhat to do if the digital display is blank on my Thommen AD20?
If the digital display on your Thommen Measuring Instrument is blank, the issue might stem from a power supply failure, so ensure the power supply is working correctly. Alternatively, it could be due to an input signal failure; in this case, verify the input signal. A third possibility is an electronic module failure, which would require repairing the electronic module.
Why is the pointer not moving on my Thommen AD20?
If the pointer on your Thommen Measuring Instruments isn't moving, it could be due to a power supply failure. Ensure the power supply is functioning correctly. Another potential cause is an input signal failure, so verify the input signal. Lastly, it could be an electronic module failure, which would require repairing the electronic module.
What to do if Thommen Measuring Instruments show indicated values out of tolerance?
If the indicated values on your Thommen Measuring Instruments are out of tolerance, it could be due to an input signal failure, so verify the input signal. Another possibility is a calibration error, which would require you to calibrate the instrument. Finally, an electronic module failure could be the cause, and this would need repairing the electronic module.
Why is there a lighting defect in my Thommen AD20?
If the lighting in your Thommen Measuring Instruments has a defect, it might be due to a power supply failure, so ensure the power supply is working correctly. Another potential cause is the CPU module, so make sure or repair the CPU module. A third possibility is the lighting module, so make sure or repair the dial lighting module.
What to do if the digital I/O fails on my Thommen AD20 Measuring Instruments?
If the digital I/O fails on your Thommen Measuring Instruments, it could be due to an I/O signal out of tolerance, so verify the I/O signal. Alternatively, it might be an electronic module failure, which would require repairing the electronic module.
How to fix brightness if it does not change on Thommen AD20 Measuring Instruments?
If the brightness of the digital display on your Thommen Measuring Instruments does not change, it could be due to the CPU module. In this case, make sure or repair the CPU module. Another possible cause is the Dual Lighting module, so make sure or repair the dial lighting module.
What to do if the pointer is blocked on Thommen AD20 Measuring Instruments?
If the pointer on your Thommen Measuring Instruments is blocked, it might be due to an electronic module failure, which would require repairing the electronic module.
Why does the pointer fail to return to power off position on Thommen Measuring Instruments?
If the pointer on your Thommen Measuring Instruments fails to return to the power-off position, it could be due to a power back-up failure, which would require repairing the electronic module.
General| Brand | Thommen |
|---|---|
| Model | AD20 |
| Category | Measuring Instruments |
| Language | English |
Overview of the AD20 Standby Altimeter manual's purpose, scope, and target audience.
Explains the manual's objective, content, and user qualifications for the AD20 Altimeter.
Details the technical specifications and requirements for the AD20 Standby Altimeter.
Lists relevant documents forming the basis of approvals for the AD20 Standby Altimeter.
Provides identification details for the AD20 Standby Altimeter, including drawings and plates.
Shows the type identification drawing and specifications for the AD20 Standby Altimeter.
Illustrates the identification and name plate details for the AD20 Standby Altimeter.
Lists the necessary components included in the installation kit for the AD20 Standby Altimeter.
Outlines the key technical specifications and performance parameters of the AD20 Standby Altimeter.
Details the physical dimensions and measurements of the AD20 Standby Altimeter unit.
Describes the specifications and characteristics of the pneumatic pressure port on the AD20 Altimeter.
Presents a block diagram illustrating the interface connections of the AD20 Standby Altimeter.
Provides general information and an overview of the AD20 Standby Altimeter unit.
Describes the AD20 Standby Altimeter, its components, and overall design.
Details the AD20 Standby Altimeter's measured altitude, display, and operational features.
Explains the functional aspects and operation of the AD20 Standby Altimeter.
Details the digital altitude display, altitude pointer, and scale settings of the AD20 Altimeter.
Explains the controls of the AD20 Standby Altimeter, including knobs and buttons.
Explains the underlying theory of operation for the AD20 Standby Altimeter.
Describes the sequence of tests performed when the AD20 Standby Altimeter powers on.
Details the different types of Built-in-Test (BIT) functions for the AD20 Standby Altimeter.
Explains the different failure modes and how the AD20 Standby Altimeter handles them.
Details the approvals and certifications met by the AD20 Standby Altimeter.
General statement regarding the approval status and compliance of the AD20 Standby Altimeter.
Provides instructions for maintaining the AD20 Standby Altimeter's airworthiness and required tasks.
Outlines the environmental conditions and qualification standards the AD20 Standby Altimeter meets.
Describes the design, analysis, installation, and testing for aircraft electromagnetic environment.
Proves electromagnetic compatibility, ensuring no degradation due to EMI with other systems.
Controls EMI generation and susceptibility according to RTCA/DO-160D.
Specifies the maximum allowable pointer position error for the AD20 Standby Altimeter.
Defines scale error tolerances as specified in Section II Part 3 Para A.8.
Limits apparent hysteresis for stability of the AD20 Standby Altimeter display.
Covers the installation process, including checks, interface, and diagrams for the AD20 Altimeter.
Introduces the installation section, covering pre-installation checks and interface data.
Guides on how to unpack and visually inspect the AD20 Standby Altimeter for shipping damage.
Details pre and post installation checks to ensure the AD20 Altimeter meets performance specs.
Describes the electrical interfaces of the AD20 Standby Altimeter, including power and data.
Lists the electrical interfaces for the AD20 Standby Altimeter: power, lighting, and data.
Details the 28 VDC power supply requirements for the AD20 Standby Altimeter.
Shows values of power consumed by the AD20 Standby Altimeter at different operating stages.
Explains the indication for power supply failure or switching off the instrument.
Provides guidelines for grounding and shielding to prevent interference and ensure safety.
Details requirements for shielded power wire harnesses to meet RF susceptibility.
Details requirements for unshielded power wire harnesses to meet RF susceptibility.
Details the electrical connector type and pin assignments for the AD20 Standby Altimeter.
Provides the specific pin assignments for the MS3112E-14-19P connector.
Illustrates the wiring diagram for shielded power wires relevant to RF Susceptibility.
Illustrates the wiring diagram for unshielded power wires relevant to RF Susceptibility.
Describes the digital data interfaces for the AD20 Standby Altimeter, including ARINC 429.
Details the ARINC 429 data bus interface, including speed and label formats.
Specifies digital data standards for ARINC 429 Mark 33 DITS and ARINC 706 ADS.
Defines the ARINC 429 data bus speed options: High Speed and Low Speed.
Specifies label formats according to ARINC 429 Mark 33 DITS, equipment ID 006.
Details the format and data for ARINC Label 203, representing Pressure Altitude.
Details the format and data for ARINC Label 204, representing Baro corrected altitude.
Details the format and data for ARINC Label 217, representing Static Pressure.
Details the format and data for ARINC Label 234, representing Baro correction in hPa.
Details the format and data for ARINC Label 235, representing Baro correction in inHg.
Details the format and data for ARINC Label 270, representing Discrete Word #1.
Details the format and data for ARINC Label 350 (Maintenance word #1), content to be defined.
Details the discrete inputs and outputs and their functions on the AD20 Standby Altimeter.
Details the voltage levels for the five discrete inputs available on the AD20 Altimeter.
Describes the functions assigned to the discrete input pins by parameterization.
Explains how aircraft type is detected via pin strapping and assigned parameters.
Details the discrete outputs available for warning flags and battery status.
Describes the RS232 interface for maintenance and calibration purposes only.
Provides information and remedies for troubleshooting common malfunctions of the AD20 Standby Altimeter.
Summarizes the maintenance modes available for the AD20 Standby Altimeter.
Details the manual maintenance mode for accessing internal settings and maintenance functions.
Explains how to enter the manual maintenance mode via the UNIT button.
Details the procedure for determining the current capacity of the instrument's battery.
Describes the high resolution display indicating baro corrected altitude in 1 foot resolution.
Explains how to select and configure lighting curves for different aircraft types.
Details how to adjust the instrument's lighting characteristics for each dim step.
Provides an overview of the standard and optional features of the AD20 Standby Altimeter.
Lists and describes failure codes associated with the AD20 Standby Altimeter.
Presents the calibration table for the AD20 Standby Altimeter, showing tolerances.
