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Aviation Maintenance Management Why We Have to Do Maintenance Chapter 1 January 28 1871 The last balloon to leave Paris during the Persian siege takes off with ... – PowerPoint PPT presentation

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Title: Aviation%20Maintenance%20Management

Aviation Maintenance Management
  • Why We Have to Do Maintenance
  • Chapter 1

  • January 28
  • 1871 The last balloon to leave Paris during the
    Persian siege takes off with orders for the
    French fleet to bring food and supplies to
    replenish the French capital, an armistice having
    been signed.
  • The flight of the General Cambronne ends a
    period of almost exactly 5 months during which
    the advantages of balloons were put to efficient

  • January 28
  • 1945 The Burma Road is reopened.

  • January 28
  • 1945 The USAAF 8th AF observed its 3rd birthday
    with a 1,000 plane raid on Germany.

Aviation Maintenance Management
  • Introduction
  • Design The Role of the Engineer
  • Role of the Mechanic
  • Types of Maintenance
  • Reliability Redesign
  • Failure Rate Patterns
  • Other Maintenance Considerations
  • Summary

  • Schedule pressures, parts shortages, equipment
    deficiencies, regulatory and agency compliance
    inspections, union pressures etc..
  • Technology advancements and diverse equip
    require perpetual training
  • Parts issues no parts, cannibalization,
    aircraft on ground, weather conditions
  • Personnel issues financial, family, substance
    abuse, late, no-show, vacations, trng, meetings
    impact (touch labor)
  • Unscheduled Maintenance

Managerial Challenges
  • Aircraft out of service impacts
  • crew training and readiness
  • Lost of revenue (no passengers and maint/labor
  • Loss of customer loyalty (customer is price
  • Intent of course not to make you an expert
    maintenance manager but to expose you to the
    various influences and the functions and
    techniques of the job
  • Knowledge is power

Modern Day Aircraft Maintenance
  • Aircraft require preventive or corrective
    maintenance at frequent intervals
  • Kind of operation environmental conditions
    storage facilities avail age and construct of
  • Maintenance Man-hours per Flying hour (MMH/FH)
  • Cost to maintain a particular type of aircraft

Modern Day Aircraft Maintenance
  • Cost of ownership fuel, wash, oil, tires etc
  • Scheduled maintenance
  • Goal is to correct any deficiency before it
  • Checks cost money labor and parts, fluids costs
    and loss of passenger revenue when not flying
  • Total up all Maintenance associated costs
    subtract from revenue from aircraft and you get
    profit or loss

Design Role of Engineer
  • We can design perfect systems on paper but we can
    not build perfect systems in the real world
  • Nothing is perfect
  • Good, Fast, Cheap
  • A design engineer may be limited from making the
    perfect system by technology or the state of the
    art within any facet of the design effort
  • Limited by ability, technique or economics
  • Economics may force a redesign with reduced
    tolerances, cheaper materials and gap between
  • perfect and perfect realism

Role of the Mechanic
  • For the mechanic the gap between perfect
    perfect realism always changes predominantly
    for the worse
  • Components or systems tend to wear out from use
    or lack there of (time or environmentally
  • Misuse may cause premature deterioration or
    degradation of the system or even outright damage
  • The engineers responsibility is to design the
    system with as high degree of perfection within
    reasonable limits/constraints
  • The mechanics responsibility is to combat the
    gap between ideal realism during the
    operational lifetime of the equipment

Two Types of Maintenance
  • Preventive Maintenance (PMs)
  • Performed at regular intervals to prevent
    deterioration of the system to an unusable level
    and to keep it operational often referred to
  • Scheduled Maintenance
  • Performed daily, every flight, every 200 flight
    hours, or every 100 cycles (takeoff landings)
  • Unscheduled Maintenance
  • Various, unpredictable intervals maintenance
    actions are required to restore a system that may
    require extensive testing, troubleshooting,
    adjusting, replacement, restoration, or complete
    overhaul of parts or subsystems

Maintenance Defined
  • Cost of Ownership and scheduled maintenance are
    2/3 of equation
  • Unscheduled Maintenance random failures
  • Reliability studies have led to MTBF (Mean Time
    Between Failure) components / system
    guesstimated reliability factor
  • Induced failures FOD, damage from servicing
    vehicles, maintenance malpractices
  • Inherent failures delamination of composites,
    substandard bearings, inefficient seals etc.
  • No defect A-799 or fault within tech data
    limits (require expenditure of maintenance

Reliability Redesign
  • Reliability
  • A measure of the probability that an item will
    survive to a specified operating age or time,
    under specified operating conditions, without a
  • no amount of maintenance can be performed to
    increase the systems inherent level of designed
    in-level of perfection
  • Redesign
  • When the reliability decreases a higher level
    of perfection is desired redesign may take
  • Needs to be weighed if the performance
    improvement justifies more maintenance thus the
    increase in maintenance costs ideally the
    opposite is true

Failure Rate Patterns (MTBF)
  • All systems or components fail at the same rate
    or exhibit the same patterns of wear out and
  • The maintenance performed is related to those
    rates and failure patterns (Table 1-1 pg. 10)
  • Infant mortality early high failure rate in
    components life
  • getting the bugs out
  • Causes poor design, improper parts, incorrect
    usage etc..
  • These characteristics of failure make it
    necessary to approach maintenance in a systematic
    manner to reduce peak periods of unscheduled
  • Several techniques have been designed to combat

Three Maintenance Management Techniques
  • Three Maintenance Management Techniques
  • Equipment redundancy, line replaceable units,
    minimum aircraft dispatch requirements
  • Equipment Redundancy
  • Duplicate systems primary and a backup (radios,
    navigation devices, flight control systems,
  • Instrumentation within cockpit can signify status
  • Line Replaceable Units (LRUs) black boxes
  • Designed to allow easy removal and replacement to
    reduce out of service timer of aircraft

Three Maintenance Management Techniques
  • Master Minimum Equipment List (MMEL)
  • Lists ALL equipment for the aircraft model list
    is tailored to its MEL
  • Minimum Equipment List (MEL)
  • List of equipment that the aircraft may be
    inoperative but still allowed to fly as long as
    it does not affect the safety operation of
    flight Tailored to mission
  • Determined by manufacturer and sanctioned by the
    regulatory authority (FAA)

Three Maintenance Management Techniques
  • Minimum Equipment List (MEL)
  • Concept of the MEL is to allow the deferral of
    maintenance without upsetting mission
  • Maintenance must be performed within some set of
    guidelines (1, 3, 10, or 30 days or cycles
    required) depending on operational requirements
    of the system
  • Pilot may always require or defer maintenance per
    the MEL
  • Maintenance MUST abide by decision. (his call)
  • Takes a college education to break it a high
    school education to fix it.

Minimum Equipment List (MEL)
  • Dispatch Deviation Guide (DDG)
  • Instructions for maintenance not necessary
    obvious to the mechanic tying up cables,
    capping off connectors, taking circuit breakers
    out to prevent inadvertent power-up of equipment
    during flight while maintenance is being
    performed and any other precautionary steps that
    need to be taken
  • Configuration Deviation List (CDL)
  • List of information of equipment or panels etc.
    that may be missing or added per that aircraft
  • All lists can be found in the aircraft logbook
  • 3 techniques help minimize the workload and
    reduce service interruptions due to maintenance

  • The purpose of aircraft maintenance is to ensure
    the aircraft will remain airworthy throughout its
    operational life
  • Still havent reached perfection even with
    advances in technology
  • 3 maintenance techniques help manage maintenance
  • Not all aircraft maintenance activities will be
    organized or operated in the same manner but the
    programs and activities will be the same
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