ARP4754B sensor systems
ARP4754B development assurance evidence review for sensor systems
This review checks a sensor-system package against ARP4754B and reports the development-assurance gaps a reviewer would raise. A supplier's certification team runs it ahead of submittal or in response to a finding. It looks at requirement trace, calibration evidence, and the installation effects that change how a sensor performs once it is on the aircraft, and it confirms each is captured and verified against the aircraft-level sensor objectives. The output is a standards map, a gap list, and a workable order for closing the open objectives.
When this review is needed
- A sensor-system package is heading for submittal and the supplier wants its ARP4754B gaps found early.
- Calibration evidence exists at the bench but its link to the in-service performance requirement has not been checked.
- Installation effects on the sensor were characterized but never captured as requirements.
- A finding response depends on knowing which sensor objectives the current evidence answers.
The problem
A sensor performs one way on the bench and another once it is installed, and the difference between the two is where sensor packages break under ARP4754B. Calibration data is usually strong, but the installation effects, mounting, airflow, thermal environment, and electromagnetic surroundings, shift the real performance, and those effects rarely make it into the requirement set as validated items. The package proves the sensor is accurate in isolation while the objective asks whether it is accurate as installed.
What gets reviewed
- Requirement trace from aircraft-level sensor objectives to the sensor's measured behavior
- Calibration evidence linked to the performance requirements it supports
- Installation effects captured as requirements and verified in the installed condition
- Sensor accuracy and range verification mapped to ARP4754B objectives
- DO-160G environmental qualification for the installed sensor conditions
- Configuration control so the reviewed sensor baseline matches the submitted one
What gets validated
- Installation effects that change sensor performance are captured as requirements and verified as installed
- Calibration evidence links to a stated in-service performance requirement, not bench accuracy alone
- The trace from aircraft-level sensor objectives reaches the measured behavior without a gap
- Accuracy and range verification reflects the installed condition, not only the isolated unit
- DO-160G categories match the thermal, vibration, and electromagnetic environment at the mount
Evidence normally required
- The sensor-system certification plan with its ARP4754B objectives
- Calibration data and the performance requirements it supports
- Installation-effect characterization for the sensor
- DO-160G qualification reports for the sensor
- Aircraft-level sensor objectives and their allocation
Common discrepancies
- Calibration proven at the bench with no link to an in-service performance requirement
- Installation effects characterized in test but never captured as validated requirements
- A trace gap between the aircraft-level sensor objective and the sensor's measured output
- Environmental qualification that does not cover the conditions at the actual mounting location
What is at stake
A reviewer who cannot see installation effects captured as requirements treats the in-service accuracy as unproven, and the objective stays open regardless of how clean the calibration is. Characterizing those effects after a finding, when the installation may already be fixed, is slower and more constrained than capturing them during development.
Move from findings to resolution
Identify gaps against the means of compliance.
How the work runs
Separate bench from installed
Distinguish what the calibration proves in isolation from what the objective asks about installed performance.
Capture installation effects
Check whether mounting, airflow, thermal, and electromagnetic effects are stated as validated requirements.
Trace to the sensor objective
Follow the aircraft-level sensor objective down to the measured output and mark the breaks.
Order the closures
Sequence so installation-effect capture precedes the installed-accuracy trace that depends on it.
What the buyer receives
- A standards map tying each ARP4754B objective to the sensor evidence that answers it
- A gap list naming the missing installation-effect requirement or trace for each open objective
- A closure order that captures installation effects before the accuracy trace above them
Who uses the output
- Certification engineers assembling the sensor-system submittal
- Engineering leads deciding how to formalize installation effects into requirements
- Compliance managers tracking objective closure before a finding response
How the work fits into the transaction or program
The review runs before submittal or after a first finding, giving the sensor team a clear read on the gap between bench accuracy and installed performance that ARP4754B cares about. Its closure order steers the certification plan toward capturing installation effects rather than re-proving calibration already done.
Start with a single asset
Confirm requirements trace through verification.
Jurisdiction-specific considerations
FAA and EASA can hold different expectations for how installed sensor performance is substantiated, and a bench-focused evidence set that satisfies one may need installation-condition data for the other. The review flags where the installed-performance evidence must be extended for the second authority.
Regulatory limits
The review maps evidence to ARP4754B objectives and identifies gaps. It does not perform calibration or installation characterization, agree a compliance finding, or determine that the sensor system is airworthy.
What this review does not cover
- Producing the missing installation-effect requirements or characterization
- Running calibration or DO-160G qualification activities
- Agreeing the sensor finding with the authority
Specific to this review
- Sensor packages fail ARP4754B on the gap between bench accuracy and installed accuracy, because installation effects change the real performance and are rarely captured as requirements.
- Calibration evidence is usually the strongest artifact in a sensor file, which is exactly why the missing installation-effect requirement is easy to overlook.
- Once the installation is frozen, characterizing its effects retroactively is constrained, so capturing them during development is far cheaper than after a finding.
Sources
SAE International. Development assurance process at aircraft and system level, including requirements capture and validation.
U.S. Government (eCFR). Type certificates, STCs (Subpart E), TSO authorizations (Subpart O), PMA (Subpart K), and export airworthiness approvals (Subpart L).
Federal Aviation Administration. FAA type certification process, certification basis establishment, and compliance findings.
Frequently asked questions
Our calibration is thorough. Why is installed performance a separate gap?
Calibration shows the sensor is accurate in isolation. The ARP4754B objective asks whether it is accurate as installed, which depends on effects the mounting introduces. If those effects are not captured and verified as requirements, the installed performance stays unproven even with excellent calibration data.
Relevant glossary terms
Related pages
Where this fits
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