Presented to: SBAS Technical Interoperability Working Group Date: 21 June 2005 Federal Aviation Administration Certification of the Wide Area Augmentation

Presented to: SBAS Technical Interoperability Working Group

Date: 21 June 2005

Federal AviationAdministrationCertification of the

Wide Area Augmentation System (WAAS)

Dan Hanlon

WAAS Program Manager

Federal AviationAdministration

2Certification of the Wide Area Augmentation System (WAAS)21 June 2005

A New Paradigm

• WAAS was the first navigation aid to be certified nationally

• As such, many of FAA’s standard certification criteria had to be tailored to fit the program



Steps to Certification

• FAA Administrator Directs Establishment of an Independent Review Board (IRB) – Role: Perform an Independent Assessment of the

Need for a Satellite Based Augmentation System and to Independently Review the Technical Solution Proposed by the WIPP

– Reported Findings to the Administrator

• WAAS Program Office Establishes a WAAS Integrity Performance Panel (WIPP)– Role is to Establish Technical Approach and

Solution for Meeting Integrity



Steps to Certification

• WIPP Comprised of WAAS Experts……(FAA, Academia, Industry)

• WIPP Meetings with Contractor Held Monthly to Review and Evaluate Contractor’s Progress

• FAA Briefed Status of WIPP Activities to IRB who then Reported Back to Administrator



Role of the WAAS Integrity Performance Panel (WIPP)

• Provided The Needed Expertise To Help Define The Actual Threats Or Threat Models That WAAS Would Have To Be Designed To Protect Against

• WIPP Was Charged With Defining The Extent Of The Threats Including Their Description And Likelihood

• WIPP Judged The Completeness Of A Monitor’s Design

• WIPP Insured That The Threat Models Generated Fully Spanned All Feared Events



FAA Certification

In-Service DecisionJRC

Safety Certification Operational Certification Security Certification

Safety Assurance Process P(HMI) Integrity Analysis FMECA Fault Tree Analysis Performance Analysis Test & Validation

In Service Review (ISR)Checklist

Human Factors Logistics & Support ATC Procedures &

Training IAP Procedures Maintenance Procedures &

Training

Security AssuranceProcess

Vulnerability Analysis Risk Assessment Security Plan Security Certification

Accreditation Plan (SCAP)



Certification by Program Phase

• System Development– System Owned by Contractor

• Contractor Must Prove System Meets Safety Certification Criteria Prior to FAA Acceptance

• Contractor Acceptance Inspection (CAI)– Program Office Formally Accepts Ownership of System

• Operational and Security Certification Period Begins

• Joint Acceptance Inspection (JAI)– Field Satisfied That System is Functioning and All Support

Material Is in Place• Commissioning

– Requires JRC In Service Decision– System Becomes Part of National Airspace System



Types of Certification

• Safety Certification– Performed By the Product Team Prior to Acceptance From the

Contractor– Design Assurance Process Used to Provide Sufficient Proof

That The Integrity Requirements Are Achieved• Operational Certification

– Performed by Airways Facilities• Validation that WAAS is Working Properly Within the NAS

Infrastructure• Equipment is Functioning Within Limits• Operators and Maintainers Are Trained • Procedures Are in Place and Being Followed

• Security Certification– Compliance With Security Requirements, Procedures &

Training



WAAS Integrity Issue

• WAAS Integrity Design Did Not Provide Proof of Compliance For Integrity Requirement

– Traditional Testing Methods Showed That the Design “Did Not Fail”

• Complete Definition of the Potential Threat Models Was Not Performed

– Standards In Place At That Time Did Not Require This Level of Assurance

• Integrity Monitoring Algorithms Were Not Designed To Support This Type Of Analysis

• In Response– WAAS Program Office Formed WAAS Integrity Performance Panel (WIPP)– FAA Administrator Requested Independent Review Board (IRB)

• WIPP Activities Were Integrated With System Engineering and Development Activities



Summary

• Complex Architecture Requires Detailed Process and Documentation for Capturing and Assuring WAAS Safety

• FAA efforts to involve many stakeholders was crucial in resolving the integrity risk

• Future Changes to WAAS must undergo the same safety assessment activities to ensure continued system safety

Documents

Presented to: SBAS Technical Interoperability Working Group Date: 21 June 2005 Federal Aviation Administration Certification of the Wide Area Augmentation