Part 29 certification basis
Part 29 certification-basis support for equipment on transport-category rotorcraft
Part 29 certification-basis support helps a supplier whose equipment installs on a transport-category rotorcraft establish and trace the basis its installation approval rests on. It is used by avionics and equipment teams whose article goes into rotorcraft certified under 14 CFR Part 29. The work fixes the applicable amendment, accounts for the category A and category B provisions and the rotorcraft failure-effect framework, and traces compliance evidence to each applicable section. You receive a basis map and a gap assessment ready for review.
When this review is needed
- Equipment is being installed on a transport-category rotorcraft and the applicable Part 29 amendment plus the category provisions have to be fixed.
- The installation supports category A operations and the equipment's role in that capability has to be substantiated.
- The rotorcraft failure-effect framework drives the equipment's compliance argument and has to be tied to the safety assessment.
- A supplier wants the Part 29 basis and the category-dependent compliance read independently before submittal.
The problem
Part 29 carries the category A and category B distinction that shapes what an equipment function must support, and equipment work that ignores the category context misses the requirements that actually apply. Suppliers treat the rotorcraft as a heavier Part 27 case and overlook the category A provisions, substantiate failure effects at the equipment level without the rotorcraft framework, and assume an amendment that was never confirmed against the rotorcraft type data. An installation whose basis ignores the category provisions draws findings that reach into the capability the rotorcraft was certified for.
What gets reviewed
- The applicable Part 29 amendment for the rotorcraft and the installation
- Category A and category B provisions that bear on the equipment function
- Failure-effect substantiation within the rotorcraft safety framework
- The applicable sections for the specific equipment on the rotorcraft
- How each applicable section is shown to be met for the installation
- Development assurance and qualification data tied to the failure effects
What gets validated
- The applicable Part 29 amendment is fixed for the rotorcraft and installation
- The category A and category B provisions bearing on the equipment are captured
- Failure effects are substantiated within the rotorcraft safety framework
- Every applicable section is identified for the equipment on this rotorcraft
- Installation evidence maps to each applicable section and supports the claim
- The development assurance and qualification data align with the failure effects
- The equipment's role in any category A capability is traced and supported
Evidence normally required
- The rotorcraft type data and the Part 29 amendment plus category provisions
- The equipment specification and its intended installation on the rotorcraft
- The safety assessment and the failure effects proposed for the equipment
- Development assurance and qualification evidence for the equipment
- Prior authority correspondence if the program is in progress
Common discrepancies
- Category A provisions overlooked because the rotorcraft was treated as a heavier Part 27 case
- Failure effects substantiated at the equipment level without the rotorcraft framework
- An applicable Part 29 amendment assumed rather than confirmed
- The equipment's role in a category A capability left unsupported
- Installation evidence that does not trace to an applicable section
- Development assurance data inconsistent with the substantiated failure effects
What is at stake
When the category provisions or the failure-effect substantiation are missing, the installation approval stalls while the equipment's role in the rotorcraft's certified capability is reconstructed. On a transport-category rotorcraft program that delay is costly and ties up specialized engineering depth.
Move from findings to resolution
Identify gaps against the means of compliance.
How the work runs
Fix the basis and category
Confirm the Part 29 amendment and the category A and B provisions that bear on the equipment.
Place the function
Establish the equipment's role in the rotorcraft's certified capability and its failure effects.
Substantiate in the framework
Tie the failure effects to the rotorcraft safety framework and the development assurance data.
Trace and package
Map evidence to each applicable section and produce a prioritized closure list.
What the buyer receives
- A Part 29 certification-basis map including the category provisions
- A failure-effect substantiation tied to the rotorcraft safety framework
- A section-to-evidence trace for the installation
- A prioritized list of the basis and substantiation gaps to close
Who uses the output
- Certification leads preparing the rotorcraft installation approval data
- Safety and engineering teams closing the substantiation gaps
- Program management sequencing the remaining compliance work
How the work fits into the transaction or program
The work supports the supplier's own Part 29 installation program. It places the equipment function inside the category A and B framework and substantiates its failure effects before submittal so the capability questions are settled in the evidence rather than in review.
Start with a single asset
Confirm requirements trace through verification.
Aircraft-specific considerations
Transport-category rotorcraft apply the category A and category B distinction that governs the performance and failure provisions in play. An equipment function is evaluated for its role in the rotorcraft's certified capability and its failure effects within the rotorcraft safety framework, so the basis work is anchored to the rotorcraft type data and its operating category rather than to the equipment alone.
Regulatory limits
Endeavor Elements supports the applicant's certification basis and compliance evidence. It does not establish the basis on the authority's behalf, determine a rotorcraft's operating category, or guarantee approval. The authority sets the basis and makes the findings.
What this review does not cover
- Establishing the basis or determining the operating category on the authority's behalf
- Issuing any approval or making official compliance findings
- Performing the safety testing or qualification itself
Specific to this review
- Transport-category rotorcraft carry a category A and category B distinction that shapes the performance and failure requirements an equipment function must support.
- Category A involves engine-isolation and continued-operation provisions that change what an equipment function has to substantiate, so an installation that ignores the category misses requirements that apply.
- Failure effects on a transport-category rotorcraft are evaluated within the rotorcraft safety framework, so substantiating them at the equipment level alone is a frequent gap.
- Treating a transport-category rotorcraft as a heavier normal-category case is a recurring error, because the category provisions and failure framework are specific to Part 29.
Sources
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.
SAE International. Development assurance process at aircraft and system level, including requirements capture and validation.
SAE International. Safety assessment methods (FHA, PSSA, SSA, FTA, FMEA) supporting development assurance level assignment.
Frequently asked questions
Why does the category A or B distinction matter for our equipment?
The category sets the performance and failure provisions the rotorcraft is certified to, and that determines what an equipment function must support. Overlooking it because the rotorcraft looks like a heavier Part 27 case is a common finding.
Do you decide the rotorcraft's operating category?
No. The category is part of the rotorcraft's certification. The work places the equipment function inside whichever category applies and substantiates its failure effects accordingly.
Relevant glossary terms
Related pages
Where this fits
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