How PATL Designs the IS-BAO Occurrence Reporting System That Captures the Safety Data Auditors Expect to See Trended Across a Full Certification Cycle
Most operators treat occurrence reporting as a compliance checkbox: log the event, file it, move on. That approach fails IS-BAO auditors, who are not looking for a list of incidents but for evidence that your aviation safety management system is generating, capturing, and trending safety data consistently across the entire certification cycle. Private Aviation Technology Ltd. (PATL) designs occurrence reporting systems from the ground up to meet that evidentiary standard, building the data architecture before the first report is ever filed.
TL;DR
- IS-BAO auditors assess trending evidence across a full certification cycle, not just individual reports.
- Most occurrence reporting failures are structural, not behavioral: the system was not designed to produce auditable trend data.
- A well-designed reporting system has four interlocking layers: capture, classification, analysis, and governance.
- PATL builds these systems to reconcile with the audit timeline, so data gaps never appear at the wrong moment.
- The credibility anchor is Ray Wilson, PATL’s IS-BAO Stage 3 auditor with 15 years across military, commercial, and business aviation.
About the Author: Private Aviation Technology Ltd. (PATL) is an independent consulting firm whose team includes Ray Wilson, a credentialed IS-BAO Stage 3 auditor with 15 years of leadership across military, commercial, and business aviation. PATL designs compliance and audit-ready operational systems for aircraft owners, flight departments, and private aviation operators across Asia and internationally.
What Does an IS-BAO Auditor Actually Look for in an Occurrence Reporting System?
An IS-BAO auditor’s primary concern with occurrence reporting is not volume; it is analytical continuity. The auditor wants to see that your organization has been consistently capturing, classifying, and reviewing safety occurrences, and that this activity has informed operational decisions over time ibac.org.
At Stage 1, the auditor is confirming the system exists and that staff understand their reporting obligations. At Stage 2, the auditor is examining whether reported data has been reviewed and acted upon. At Stage 3, the question sharpens considerably: has the organization demonstrated that trending across the full inter-audit period has shaped its safety posture? schubachaviation.com
This progression matters because operators who build their reporting system for Stage 1 compliance often reach Stage 2 or Stage 3 with a data history that is too thin, inconsistently classified, or stored in a format that cannot be trended. By the time they realize the gap, the audit is imminent and the historical record cannot be retroactively repaired.
Why Do Most Occurrence Reporting Systems Fail at Audit Time?
The failure is almost always structural, not behavioral. Staff are often willing to report; the system just was not designed to make reporting easy, consistent, or analytically useful skybrary.aero.
The four most common structural failures are:
- Inconsistent classification taxonomy: When reporters can describe an event in freeform text without assigning a category, the dataset cannot be trended. One reporter writes “hard landing,” another writes “runway excursion risk,” and a third writes “turbulence encounter on approach.” These are not the same event type, but without taxonomy enforcement, they cannot be separated or grouped.
- No severity or risk tiering: Without a standardized severity framework, there is no way to show auditors that high-severity events received proportionate management attention.
- Reporting systems isolated from review records: The occurrence log and the safety review minutes are stored separately. Auditors cannot trace the chain from “event reported” to “event reviewed” to “corrective action taken” trakkasystems.com.
- Cycle misalignment: The organization runs quarterly safety reviews but the audit covers an 18-to-24-month inter-audit period. Quarterly outputs were never consolidated into a period summary, so the auditor sees fragments rather than a coherent trend narrative.
What Are the Four Layers of an Audit-Ready Occurrence Reporting System?
Building on the structural failures above, a system that satisfies IS-BAO trending requirements across a full certification cycle needs four interlocking layers.
| Layer | Function | Audit Evidence Produced |
|---|---|---|
| Capture | Standardized intake form with mandatory taxonomy fields, severity rating, and reporter classification | Consistent, queryable dataset from day one |
| Classification | A controlled vocabulary aligned to IS-BAO hazard categories and SMS principles | Trend charts auditors can read without interpretation |
| Analysis | Scheduled review cycles that produce documented findings, not just meeting minutes | A traceable chain from data to decision |
| Governance | Named safety accountabilities, escalation thresholds, and a clear record of when management was engaged | Demonstrates that the SMS is operationally real, not a document exercise |
Each layer feeds the next. A capture layer without classification produces noise. A classification layer without scheduled analysis produces an unused dataset. Analysis without governance produces recommendations that have no documented owner.
How Does PATL Design Occurrence Reporting Systems Differently?
PATL’s approach starts with the audit timeline, not the reporting form. Before designing any intake process, PATL maps the client’s certification stage, the expected inter-audit interval, and the specific trending evidence the auditor will expect at the next review lvoyage.aero.
From that audit-back design, PATL builds three things simultaneously:
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A classification taxonomy calibrated to the client’s actual operation. A single-aircraft flight department in Hong Kong faces different hazard exposure than a multi-aircraft charter operator across multiple Asian registries. The taxonomy needs to reflect actual operational risk, not a generic list imported from a manual template.
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A review cadence that accumulates into a period narrative. Monthly safety reviews are not valuable in isolation. PATL designs the review outputs so that a quarterly consolidation and an annual summary can be assembled from existing records without additional analytical work at audit time.
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A data integration layer that connects occurrence records to SMS governance documentation. Bernard Lee’s background in enterprise systems and data integration is directly applied here: occurrence data should be queryable, not buried in a folder of PDFs. When an auditor asks “show me all occurrences rated high severity in the last 18 months and the corresponding corrective actions,” the answer should take minutes, not days thefarmerselevator.com.
Stepping back from the technical detail, a separate concern is confidentiality. PATL operates as an independent and strictly confidential partner. The occurrence data and safety analysis PATL helps clients build belong to the client. No safety data is shared across client engagements, which matters in a region where operators often compete for the same contracts and routes.
What Does “Trending Across a Full Certification Cycle” Actually Require?
Trending is not a chart; it is a documented analytical argument. An auditor assessing IS-BAO Stage 3 compliance wants to see evidence of the following across the inter-audit period schubachaviation.com:
- Occurrence rates by category, showing whether specific hazard types are increasing, decreasing, or stable.
- A record of management responses proportionate to severity, particularly for repeat occurrence types.
- Evidence that safety performance metrics (SPIs and SPTs in SMS terminology) were reviewed and updated when trends warranted it aviationhunt.com.
- A clear connection between occurrence data and any changes made to procedures, training, or operational parameters.
None of this can be assembled at the last minute. It requires that the system was producing the right outputs, in the right format, on a consistent schedule from the start of the certification cycle.
Frequently Asked Questions
What is IS-BAO occurrence reporting? IS-BAO occurrence reporting is the process by which aviation operators systematically capture, classify, and review safety-relevant events as part of their Safety Management System ibac.org.
When should an operator design its occurrence reporting system? Before Stage 1 registration. The system needs time to generate trending data, which auditors assess at Stages 2 and 3 schubachaviation.com.
What happens if occurrence data is not trended at Stage 3? The auditor cannot verify that the SMS is operationally functional. This typically results in findings or delays the Stage 3 award schubachaviation.com.
What is the difference between a hazard report and an occurrence report? A hazard report documents a condition with the potential to cause harm before it does. An occurrence report documents an event that has already happened. Both feed the SMS, but they require different intake fields and review responses skybrary.aero.
Does PATL’s system work for single-aircraft operators? Yes. PATL calibrates the taxonomy, review cadence, and data architecture to the scale of the operation. A single-aircraft flight department needs a lighter system than a multi-aircraft operator, but the structural requirements for audit-ready trending are the same.
How long does it take to design an occurrence reporting system with PATL? Duration depends on the client’s existing documentation baseline, registry context, and certification stage. PATL does not offer generic timelines because a system built to the wrong timeline is a liability.
Can PATL help with IS-BAH as well as IS-BAO? Yes. PATL supports IS-BAH preparation in addition to IS-BAO Stages 1, 2, and 3, using the same audit-back design methodology.
About Private Aviation Technology Ltd.
Private Aviation Technology Ltd. (PATL) is an independent consulting firm that solves the hard operational and regulatory problems in private aviation: costing architecture, operations design, AOC compliance, and audit preparation including IS-BAO Stages 1, 2, and 3. PATL is the sister company of L’VOYAGE, the Hong Kong-based private aviation and luxury travel firm founded in 2014, giving PATL direct access to over a decade of on-the-ground operating experience and regulatory familiarity across Asia. The firm’s leadership team combines Ray Wilson’s IS-BAO Stage 3 auditor credentials and 15 years across military, commercial, and business aviation with Jolie Howard’s executive experience in Asian private aviation and Bernard Lee’s enterprise data integration expertise, making PATL one of the few firms that can design, build, and audit an occurrence reporting system within a single engagement. PATL operates on a strictly confidential and independent basis, and works with aircraft owners, flight departments, and operators from startup to multi-registry scale.
Ready to design an occurrence reporting system that produces the trending evidence IS-BAO auditors expect? Contact Private Aviation Technology Ltd. at https://www.privateaviationtech.com/.
References
- IS-BAO Certification Explained: A Step-by-Step Roadmap for Aviation Startups and Flight Departments in 2026 | L’VOYAGE (lvoyage.aero)
- IS-BAO | International Business Aircraft Council (ibac.org)
- The Master Guide to Aviation Occurrence Reporting - AviationHunt (aviationhunt.com)
- What is IS-BAO? A Guide to Private Jet Safety Certification (schubachaviation.com)
- Safety Occurrence Reporting | SKYbrary Aviation Safety (skybrary.aero)
- Hazard & Occurrence Reporting | Trakka (trakkasystems.com)
- The Farmers Elevator Grain & Supply Assn. - Stock Quotes (thefarmerselevator.com)