Certification of Engine HUMS in the ADF

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Certification of Engine HUMS in the ADF
SQNLDR David Hood Engine Structural Integrity
section
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Scope of Presentation

• Engine HUMS definition
• Certification standards HUMS content
• Example of ADF HUMS issues
• The HUMS Validation Plan (HUMSVP)
• Questions

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Engine HUMS definition
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Definition

• A system which monitors and records
• the Health (Condition) and
• life-limited component life usage
• Of the engine(s), with some level of automation
• System implies all hardware/software/equipment
  required
• air and ground components
• Propulsion system focus (only)

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Certification Standards HUMS content
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Civil standards

• FAR 23 and 25 no requirements
• FAR 27 and 29 requirements for HUMS
• Very useful requirements and verification
  guidance
• AC 27-1B and AC 29-2C
• Only applicable to very late changes to FARs
• no ADF aircraft designed to this standard (not
  even MRH-90)
• FAR 33 no requirements
• EASA CS-E no requirements

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Military standards

• DEFSTAN 970 Pt 11 no requirements
• JSSG-2007 requirements for Engine Monitoring
  System
• Very useful requirements and verification
  guidance
• Para 3.7.6, A3.7.6/4.7.6
• No ADF engines designed to this standard

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What does this mean?

• The lack of certification standards does not
  imply HUMS are typically bad
• But the ADF has experienced in-service issues
  relating to HUMS
• Operational and logistics impact

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Example of ADF HUMS issues
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BAe Hawk 127 LIF

• Entered ADF service in Oct 2000 without
• Engine Structural Integrity Management Plan
  (ESIMP)
• The HUMS certified for critical component Usage
  Monitoring (UM)
• HUMS proved to be unable to conduct UM
• Incorrect data transfer and storage
• Airframe structural UM issues also
• Service Release limitation requiring interim UM
  measures to ensure continued airworthiness

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BAe Hawk 127 LIF

• Independent validation effort of HUMS conducted
  by
• QinetiQ (UK) engine lifing algorithms
• ASI/DSTO engine raw data
• Ball Solutions Group recording functionality,
  Instructions for Continued Airworthiness and
  ESIMP
• Activities supported by BAe Systems ADF Hawk
  TLS contractor

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BAe Hawk 127 LIF

• SR limitation removed post 2003 Airworthiness
  Board 3 years later
• Improvements to the HUMS still being made in 2004
• Very large cost and time issues

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As a result of these issues

• ADF specific HUMS requirements defined
• Focus on validation, not design
• ADF recognises we cannot usually affect design
• Policy in AAP7001.054 Airworthiness Design
  Requirements Manual
• Sect 2 Chap 19
• Revision (soon to be published) aligns HUMSVP to
  FAR 29 and JSSG2007 guidance

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The HUMS Validation Plan (HUMSVP)
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Purpose

• To provide a repeatable, systematic approach to
  HUMS validation
• Allows HUMS to be certified as the executive
  lifing tool
• Allows ADF confidence that the HUMS conducts UM
  and CM adequately
• Cost effective and efficient

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Process

• HUMSVP conducted for all ADF aircraft with HUMS
• Requirement agreed to before ADF Type
  Certification (TC)
• Completed (as soon as possible) after entry to
  service
• In-service testing required
• Process validates key areas of HUMS

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Process

• UM algorithm validation
• Operation of algorithm against reality
• HUMS data management
• Data flow from air to ground system
• Substitution (fill in) process for lost/corrupt
  data
• Engine/component changes
• Management of life exceedences
• ADF system interfaces (CAMM2, etc)

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Process

• Database design/storage
• UM data downloaded, stored, retrievable
• CM
• Historically, less important
• HUMS is not the executive tool for continued
  airworthiness
• CM covered by maintenance publications
• Becoming increasingly important
• Larger focus for the next revision to HUMSVP

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Exceptions where a HUMSVP is not reqd

• Intent of HUMSVP is contracted
• MRH90 NATO Helicopter Management Agency
  (NAHEMA)
• Intent of HUMSVP will be completed prior to ADF
  TC
• HUMS is proven
• C-17 proven design (USAF)

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Summary

• Very few Certification standards exist for engine
  HUMS
• ADF specific HUMSVP developed in response to
  in-service issues
• Systematic plan to validate HUMS
• Will need to focus more on CM validation as CM
  functionality becomes more significant for
  continued airworthiness
• KC-30B, AEWC, etc
• Only the briefest discussion possible here!
• Please refer to my conference paper

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