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Aircraft Diagnostics from Avionics Support Equipment Perspective 07 December 2010

Aircraft Diagnostics from Avionics Support Equipment Perspective 07 December 2010 . Michael Brazinski CH-53K Avionics Support Equipment NAVAIR, Lakehurst, NJ. Topics for Discussion. Diagnostics Requirements System Synthesis Model Smart Connector Development.

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Aircraft Diagnostics from Avionics Support Equipment Perspective 07 December 2010

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  1. Aircraft Diagnostics from Avionics Support Equipment Perspective07 December 2010 Michael Brazinski CH-53K Avionics Support Equipment NAVAIR, Lakehurst, NJ

  2. Topics for Discussion • Diagnostics Requirements • System Synthesis Model • Smart Connector Development

  3. Current Diagnostics Requirements • Current status quo uses boilerplate requirements statement. • Unachievable • COTS / NDI • Cost Overrun / Schedule Slippage • Specification Changes • Solution Centered • BIT • Test Equipment • Manual Procedures • Diagnostics Reasoners • Iterative R&R “The aircraft Built-In Test (BIT) shall demonstrate a Fault Detection (FD) rate of 95% or greater for all avionics and mission communications equipment. The aircraft BIT shall demonstrate a Fault Isolation (FI) rate to one Weapons Replaceable Assembly (WRA) of 95% or greater for all avionics and mission communications equipment.” • Incomplete • Avionics / Mission Communications Equip. • Ambiguous • “Avionics” vs. “Non-Avionics” Failure Modes

  4. Concepts for Future Diagnostics Requirements • Specify Mean Time to Fault Detection (MTTFD) with respect to FMECA Severity Levels. • Loosely specify (if at all) the FD/FI techniques that the systems developer shall use to implement effective diagnostics within the Mean Time to Repair (MTTR), as required. • Specify Fault Isolation (FI) Rate solely in accordance with the set of detectable faults (if any) that are acceptable to be left unrepaired indefinitely. • Specify an allowable CND rate for replaceable items sent to next level of maintenance for repair.

  5. Figures of Merit for Future Diagnostics Requirements • The mean and maximum operational times to detection of Category I and Category II failures • The percentage of Category III and Category IV failures that may be left undetected • The mean operational time to detection of Category III and Category IV failures • The MTTR • The frequency of CNDs

  6. System Synthesis Model Current Concept • NAVAIR PMA-260 System Synthesis Model Web Tool • Tester-based • Data entered aligns to CASS stimulus / response test capabilities. • Single purpose • Provides report of compatibilities / incompatibilities between CASS family and WRA. • Non-standard data format • Suppliers ICDs • No standard format • Standardized interface control database • Flows from systems engineering model • System • Subsystem • WRA • SRA • Component • Connector / signal based data at WRA-level • Multi-purpose • Reliability Analysis • Diagnostics Modeling • Test & Repair Equipment Selection • Standard Data Format • IEEE 1641, etc…

  7. MIDS Smart Connector Current Smart Connector Diagnostics • MIDS Tactical Information System • Thousands of terminals fielded. • MIDS-LVT Terminal Diagnostics Ambiguity • Receiver/Transmitter • Remote Power Supply • Cable Set • Host Power • Currently, ~60% CND rate for RPS. • $7.5K for every return • Receiver/Transmitter A799 rates between 30%-40%. • Total loss from CNDs over system lifetime >$3M to date. • IDATS at NAVAIR Lakehurst currently developing MIDS Smart Connector Tester. • Detects/isolates faults within MIDS Power Supply System • RPS • Cable Set • Host Power • Currently executing $500K from ONR to bring tester to TRL-6 level. • Full capability • Hand-held form factor • Demonstration at SIL • Mid-March 2011

  8. Thanks! Questions?

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