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Parnassus LLC performs a wide array of classical reliability, maintainability and systems safety (RMS) analysis methodologies to demonstrate product compliance to airworthiness requirements and presents the results of these studies in detailed and comprehensive engineering reports for a large number of top-tier civil and military aerospace and defense OEMs. Although the vast majority of our business is from returning customers, we always welcome well-qualified, first-time clients interested in procuring best in class Independent Technical Assessments of their internally generated findings, or in commissioning original RMS analysis and reporting services.

Representative disciplines include:

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System Safety Engineering

Civil Aviation - ARP4761A and ARP4754B style

Potential Services

  • Aircraft & System Functional Hazard Assessment (AFHA/SFHA)

  • Preliminary System Safety Assessment (PSSA)

    • (see SSA analysis methods, below)

  • System Safety Assessment (SSA)

    • Common Cause Analysis

      • Zonal Safety Analysis (ZSA)

      • Particular Risk Analysis (PRA)

      • Common Mode Analysis (CMA)

    • Development Assurance Level (FDAL & IDAL) Assignments / Justifications

    • Cascading Effects Analysis (CEA)

    • Fault Tree Analysis (FTA), Event Tree Analysis (ETA)

    • Dependence Diagrams (DD), Markov Analysis (MA)

    • Model-Based Safety Assessment (MBSA)

    • Atmospheric Neutron Single Event Effects (SEE) Analysis – AIR6219

    • Candidate Certification Maintenance Requirements (CCMR)

  • Maintenance Steering Group (MSG-3)

  • Master Minimum Equipment List (MMEL)

  • Time Limited Dispatch (TLD) – ARP5107C

  • In-Service Safety Assessment – ARP5150A

Military Safety Programs – MIL-STD-882E style

Potential Services

  • Systems Safety Program Plan (SSPP)

  • Preliminary Hazard Analysis (PHA)

  • Preliminary Hazards List (PHL)

  • Subsystem Hazard Analysis (SSHA)

  • System Hazard Analysis (SHA)

  • Operating and Support Hazard Analysis (O&SHA)

  • Health Hazard Analysis (HHA)

  • Functional Hazard Analysis (FHA)

  • System-of-Systems Hazard Analysis

  • Environmental Hazard Analysis

  • Hazard Tracking & Closure

  • Hazard Tracking System (HTS) Database

Safety Program Support

  • Subject Matter Expert (SME)

Reliability Engineering

Potential Services

  • Reliability & Maintainability Program Plans (RMPP)

  • Reliability Predictions – MIL-HDBK-217F, Notice 2, Non-electronic Parts Reliability Database (NPRD), NAVSEA NSWC Carderock Handbook of Reliability Prediction Procedures for Mechanical Equipment

  • Reliability Modeling

  • Reliability Allocation

  • Reliability Growth Assessment, Growth Curves, Test Plans & Procedures

  • Reliability Development Test Plans & Procedures

Maintainability Engineering

Potential Services

  • Maintainability Analysis Reports

  • Maintenance Concepts

  • Maintainability Design Baseline (MDBL)

  • Maintainability Predictions, e.g. MTTR, MMAX, etc.

  • Maintenance Task Analysis

  • Logistics & Supportability Assessment

  • Preventative & Corrective Maintenance Evaluations

Representative Standards

  • MIL-HDBK-472

  • DI-MNTY-81602

  • Customer Requirements

FMEA / FMECA

A systematic, bottom-up method of identifying the credible failure modes and their local, next higher and system level effects, corresponding severity levels and detection methods. FMEA/FMECA may be performed qualitatively or quantitatively. Software may also be analyzed qualitatively using a functional FMEA approach.

For quantitative FMEA, where the failure rate of each failure mode (FMFR) is calculated based on component failure rates, failure mode ratios and component quantities, failure mode & effects summary (FMES) is often derived from the baseline FMEA. An FMES is a grouping of single failure modes which produce the same failure effect. In FMES analysis, the grouped failure effects are called “failure modes” and the sum of the single FMFRs can be used to populate the failure rates of the basic events contributing to related FTA events.

Potential Services

  • Functional FMEA / Functional FMECA

  • Piece-Part FMEA / Piece Part FMECA

  • Criticality Analysis

  • Built-in Test (BIT) Detection and Isolation Performance

Representative Standards

  • MIL-HDBK-1629A Notice 2

  • SAE ARP5580

  • SAE ARP4761A

  • SAE J1739 (DFMEA & PFMEA processes)

  • DI-SESS-81495B/C

Certification Support

Potential Services

  • Certification Analysis Support

  • MIL-STD-516C Compliance Documentation

  • Mishap Risk Assessment (MRA)

  • Tailored Airworthiness Compliance (TACC) against MIL-HDBK-516C criteria.

Independent Technical Assessment

Potential Services

  • Independent Engineering Review

  • Deliverable Review

  • Safety Assessment Review

  • Reliability Assessment Review

  • Design Evaluation

  • Technical Risk Identification

Independent assessments can provide additional confidence in engineering products, methodologies, and program decisions.

Standards Experience

Representative Standards

  • ARP4761A

  • ARP4754B

  • MIL-STD-882E

  • MIL-HDBK-217

  • MIL-HDBK-472

  • MIL-STD-1629A

  • SAE ARP5580

  • SAE J1739

  • DI-SESS-81495B

“Their attention to detail and commitment to quality truly stood out. We’ve already recommended them to others.”

– Former Customer

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