Over the years, we've partnered with safety-critical industries to support their product design and development.
From naval vessel to metro trains, we apply system safety engineering principles to impart in-built safety. We bring our experience and lessons learned from other domains to ensure that there are no gaps.
As an example, IEC 61508 is a key functional safety standard applicable across industries, especially where specific safety standards are absent. We will customize the principles of IEC 61508 to help our clients follow a systematic approach to risk reduction adaptable to their sector.
Sectors We Serve
Cross-industry safety engineering — tailored to the standards and certification requirements of each sector.
Defense
Application of MIL-STD-882E
Hazard Analysis, Risk
Mitigation, Safety Plans and Safety Cases
Application of Joint Software Systems Safety Engineering Handbook
Naval
Tailored Applications of IEC 61508, MIL-STD-882E
Naval and Marine Vessel Certification
Safety Risk Assessment and Audits
Rail
Project-specific application of EN 5021x
Tailored implementation of ASCE 21-21
Requirements Management, SSHA, FHA starting from planning phase
Industrial Machinery
Diligently following IEC 61511
Safety Instrumented
Systems (SIS) Design
Safety Lifecycle
Management, SIS Verification
What we offer?
Tailored Use of Standards
ARP 4761
ARP 4754
DO-178, DO-254,
DO-326 and DO-356
Compliance with: 25.1309 & 23.2510
Safety Assessment
Tools
Conventional Tools such as: FTAs, DD, MA, and FMEAs
State-of-the-art tools such as: MBSA, CEA, COFFE, etc.
Safety Assessment Softwares: Windchill (WQS), Isograph, and Polarion
System
Expertise
Conventional Aircraft Systems, Advanced Air Mobility (AAM) Rotorcraft, RPAS
S1000D modules
such as: Mechanical, Propulsion, Avionics and Flight Controls
Case Study: RPAS Certification Support
Challenge: A Canadian RPAS manufacturer developing a complex rotary-wing drone required a full safety program to support their Transport Canada type certificate application. The program involved novel propulsion architecture with no historical failure rate data.
What QTSI delivered: Safety Program Plan, AFHA and SFHA, PSSA and SSA for the flight control and propulsion systems. FTA and FMEA for all DAL A and B functions. Failure rate substantiation using FMEDA methodology. Liaison support with Transport Canada reviewers throughout the process.
Outcome: Certification package accepted by Transport Canada. Safety assessment delivered within program schedule. Client team upskilled on ARP4761A methods during the engagement.
The Standards We Work In
Deep technical expertise in the standards relevant to your program — from defense platforms to industrial safety instrumented systems.
IEC 61508 — Functional Safety of Electrical / Electronic / Programmable Electronic Safety-Related Systems
What it is: IEC 61508 is a key functional safety standard applicable across industries, especially where specific safety standards are absent. It provides guidelines for the lifecycle management of electrical, electronic, and programmable systems, emphasising a systematic approach to risk reduction adaptable to various sectors. It also introduces Safety Integrity Levels (SILs) to quantify failure risk.
What QTSI delivers: QTSI delivers the full IEC 61508 safety lifecycle: safety plan development, SIL assignment through hazard analysis and risk management techniques, hardware analysis including FMEDA to calculate Safe Failure Fraction (SFF) and PFH/PFD, testing and validation support including fault insertion test plans, and third-party safety assessments and audits in collaboration with certification agencies such as TUV and UL.
MIL-STD-882E — System Safety
What it is: MIL-STD-882E is the US Department of Defense standard for System Safety. It establishes the requirements for developing and implementing a System Safety Program to identify hazards and assess and mitigate associated risks throughout the system lifecycle. It applies to defense acquisition programs across air, land, sea, and space domains, and covers both hardware and software safety.
What QTSI delivers: QTSI supports MIL-STD-882E programs through Hazard Analysis, Risk Mitigation planning, Safety Plan development, and Safety Case preparation. QTSI also draws on the Joint Software Systems Safety Engineering Handbook for software-intensive defense systems.
EN 5021x — Railway Applications: Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS)
What it is: The EN 5021x series — comprising EN 50126 (RAMS), EN 50128 (software), and EN 50129 (safety) — is the suite of European standards governing functional safety in railway applications. EN 50126 defines the RAMS process across the full rail system lifecycle. EN 50128 governs software for railway control and protection systems. EN 50129 covers the safety approval of electronic systems for signaling. Together they form the certification framework recognized by transport authorities across Europe and North America.
What QTSI delivers: QTSI provides project-specific application of the EN 5021x series Services include Requirements Management, System Hazard Analysis (SSHA), and Functional Hazard Analysis (FHA) for rail and transit systems. We also have experience in ASCE 21-21 American Standards for Automated People Mover.
IEC 61511 — Functional Safety: Safety Instrumented Systems for the Process Industry Sector
What it is: IEC 61511 is the functional safety standard specifically for Safety Instrumented Systems (SIS) in the process industry — covering oil and gas, chemical, pharmaceutical, and related sectors. It is derived from IEC 61508 and defines the safety lifecycle for SIS, from concept through decommissioning, including SIL determination, SIS design, operation, and maintenance. It mandates Safety Instrumented Function (SIF) definition, SIL verification, and proof test planning.
What QTSI delivers: QTSI delivers IEC 61511-compliant Safety Instrumented System design and verification, Safety Lifecycle Management, and SIS Verification activities. This includes diligent application of IEC 61511 requirements across the full SIS lifecycle — from initial hazard and risk assessment through to SIL verification and ongoing functional safety assessment.
Tools & Platforms
We deliver in the same toolchains your team already uses — no re-training required.
Ansys Medini Analyze
FMEA, FTA, FMEDA, HARA — integrated model-based safety analysis
IBM DOORS
Requirements management and safety traceability across the V-model
Siemens Polarion
Full lifecycle management, requirements, and V&V traceability
Isograph
FTA, RBD, and reliability analysis for quantitative safety assessment
Jama
Requirements management and safety traceability across the V-model
CAFTA
Failure Tree Analysis (FTA) tool.
Programs We've Supported
SIL 2
Naval system safe operating envelope certified
2000+
Hardware components in FMECA / FMEDA analysis
TUV / UL
Certification agency collaboration for OEM clients
What sets us apart?
We are your strategic partner in achieving safety excellence with diverse experience in safety standards and diverse cutting-edge technology.
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Cross-Industry Experience: Broad expertise across industries enables us to address unique safety standard nuances and meet your specific needs.
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Customization: Tailored safety solutions, from product modifications to gap analyses, backed by a proven track record of success.
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Excellence: Committed to advancing global safety practices with a focus on excellence beyond compliance.
Working on a safety-critical system program?
From submarines to metro trains, we apply system safety engineering principles to ensure successful and safe outcomes.
From the Safety Gazette
Practical insights on IEC 61508, system safety, and cross-industry functional safety engineering.
