Solid-State Avionics Display Instrument Retrofit
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Solution Overview
Problem
Existing aircraft equipped with electro-mechanical avionics display instruments face challenges in retrofitting with modern, solid-state display-based technologies due to form factor differences and regulatory approval issues, making it impractical and costly to replace these instruments.
Innovation Solution
A replacement avionics display instrument with a housing that replicates the original electro-mechanical instrument's form factor, incorporating electronic displays such as LEDs or LCDs, which can be driven by the same electrical input signals, allowing for direct installation without modifying the aircraft, and includes electronic circuitry to interface with aircraft sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-mechanical display instruments are replaced with modern solid-state display instruments, then reliability and readability are improved, but form factor compatibility and installation complexity worsen
Solution Approach 1:
The instrument is divided into separate functional modules: the display module (solid-state electronics) and the housing module (mechanical interface). This allows the display technology to be upgraded independently while maintaining compatibility with existing aircraft instrument panel openings and mounting mechanisms.
Solution Approach 2:
The housing and mechanical interface of the replacement instrument are designed to replicate or closely match the form factor, mounting interface, and external appearance of the original electro-mechanical instrument. This copying approach enables direct drop-in replacement without modifying the aircraft's instrument panel or requiring complex adapter mechanisms.
2Ease of manufacture
If the housing is replicated to match the original instrument, then ease of installation is improved, but manufacturing precision requirements worsen
Solution Approach 1:
Rather than attempting to perfectly replicate every dimensional parameter of the original housing, the design accepts certain parameter variations and tolerances. The housing is designed to match critical interface parameters (mounting hole positions, panel opening dimensions) while allowing flexibility in non-critical dimensions, reducing manufacturing precision requirements while maintaining compatibility.
3Illumination intensity
If electronic displays are used instead of electro-mechanical mechanisms, then readability is improved, but compatibility with existing electrical input signals worsens
Solution Approach 1:
Signal conditioning circuitry serves as an intermediary between the aircraft's existing electrical input signals and the solid-state display module. This intermediary electronics layer adapts and conditions the input signals to match the requirements of modern LED or LCD display technology, enabling compatibility with legacy aircraft electrical systems while providing superior display readability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the retrofitting of modern electronic avionics display instruments into older aircraft in a simple, cost-effective manner, providing clearer and more reliable readings for pilots while maintaining regulatory compliance by emulating the appearance of traditional needle indicators.
Implementation Method 1
In one form, the electronic display can comprise an LED display
Implementation Method 2
In another form, the electronic display can comprise an LCD display
Data Source
AI summary
A solid-state electronic avionics display instrument includes a needle-like display mounted within a housing in a manner that emulates the manner in which prior electro-mechanical needle indicator mechanisms have been mounted in such housings so as to indicate a value along an arcuate scale. New aircraft can be fitted with such instruments initially, while existing aircraft can be retrofitted with such instruments to replace existing electro-mechanical mechanism-based avionics instruments.