MRD

MRD Maintenance Requirements Determination is the umbrella term for: Failure Modes Effects and Criticality Analysis (FMECA), Reliability Centred Maintenance (RCM), Maintenance Task Analysis (MTA) and Level of Repair Analysis (LORA).

Maintenance Requirements Determination Software: eMRD

Maintenance Engineering Analysis – MEA

 Subjects related to Engineering Support, Failure Modes Effects Analysis, FMEA, Maintenance Engineering Analysis, Maintenance Task Analysis, MEA, MTA, MTA, RCM, Reliability Centred Maintenance
Sep 012016
 

Maintenance Engineering Analysis (MEA).

FMEA, RCM, and MTA are also referred to as Maintenance Engineering Analysis (MEA).

  • FMEA  Failure Modes Effects Analysis – How can the equipment fail and what is the effect of failure.
  • RCM    Reliability Centred Maintenance – Maintenance focused on preventive replacements in order to maximise the operational period.
  • MTA    Maintenance Task Analysis – What specific tasks need to be performed to maintain the equipment

Maintenance Requirements Determination

 Subjects related to Integated Logistics Support, Maintenance Requirements Determination, MRD
Sep 012016
 

Maintenance Requirements Determination or MRD is a fundamental part of Integrated Logistic Support.

MRD is the umbrella term for: Failure Modes Effects and Criticality Analysis (FMECA), Reliability Centred Maintenance (RCM), Maintenance Task Analysis (MTA) and Level of Repair Analysis (LORA).
FMEA, RCM, and MTA are also referred to as Maintenance Engineering Analysis (MEA).

 

Maintenance Requirements Determination Software: eMRD

Failure Modes Effects Criticality Analysis

 Subjects related to Failure Modes Effects Criticality Analysis, FMECA, Logistic Support, Logistic Support Analysis, MRD
Aug 312016
 

Failure Modes Effects Criticality Analysis
Failure Modes Effects Criticality Analysis (FMECA) is the analysis of HOW the equipment can fail, what is the effect of failure and how critical is the failure.
It is designed to identify potential failure modes for an item or system, to assess the risks involved with those failures, to categorise and order in terms of importance, identify the criticality of the failure, and to identify and either put in place mitigations or institute corrective actions to address those that can be addressed.

Level of Repair Analysis

 Subjects related to Level Of Repair Analysis, Logistic Support, Logistic Support Analysis, LORA, MRD
Aug 312016
 

Level of Repair Analysis

What is Level Of Repair Analysis?

Level Of Repair Analysis combines two elements:

  •  Cost Analysis
  •  Repair Level Analysis

Cost Analysis determines Whether maintenance should be performed; which includes all costs incurred:

  • to establish and utilise a repair venue
  • the tooling required for the repair
  •  the skill of the repairer
  • in obtaining the Training required in order to perform the repair
  • in the Rates of pay of personnel conducting the repair
  • in the Cost of conducting the repair – i.e. time
  • in the Cost of the repair parts
  • in the Transport costs of getting the equipment to and from the repair base
  • in Other overheads

Repair Level Analysis (RLA) determines Where the maintenance should be performed; this in turn determines where the equipment can be repaired:

  • Operational/Organisational Level Maintenance •Light Grade Repair
  • Organic (On-board ship)
  • On the Flight Line

 

  • •Intermediate Level Maintenance •Medium Grade Repair – Mobile workshop
    •External (Along side dock )

 

  • •Deeper/Depot Level Maintenance •Heavy Grade Repair
    •Contractor (External )
    •Maintenance Depot

Level of Repair Analysis Software : eLORA

Reliability Centred Maintenance

 Subjects related to Logistic Support, Logistic Support Analysis, Maintenance Engineering Analysis, MEA, MRD, RCM, RCM, Reliability Centred Maintenance
Aug 312016
 

Reliability Centred Maintenance
Reliability Centred Maintenance is the analysis and execution of Maintenance tasks focused on preventive replacements in order to maximise the operational period.

The focus on preventive maintenance is easily understood when consideration is given to the typical reactive type maintenance, ie “fix it when it breaks”.

In the typical reactive maintenance situation, the planned preventive maintenance gets delayed while resources are sidetracked performing emergency repairs to keep the system running after something has failed.

The delayed or cancelled preventive maintenance tasks then cause the system to be put at further risk due to it now operating beyond the planned / calculated maintenance periods. These operations beyond expected maintenance periods may place extra stress on the system, resulting in failure, diversion of maintenance resources to fix the failure, and a constant downward spiral in reliability. eg

  • An oil change that is normally scheduled to be performed at 250 operating hours gets postponed due to a separate failure elsewhere in the system.
  • The system is put back into service but the planned maintenance window for oil change has been missed and the system is now unable to be taken off-line for another 250 hours due to operational requirements.
  • So now the equipment has to run on the same oil for 500 hours rather than the planned 250.
  • If the original design did not allow for a maintenance period of twice the planned period, this may result in higher levels of contaminants and lower lubrication performance, and hence higher wear.
  • This higher level of wear may show up quickly in terms of an earlier failure of an associated piece of equipment, or it may not show up for years, instead resulting in perhaps a major overhaul at 5 years instead of the planned 10 year expected life.
  • Repeated maintenance delays may compound the unseen wear or degradation.
  • Had the oil change been able to be performed at the same time as the initial failure, the costs involved as a result of the early overhaul, or equipment failure, could probably have been avoided.

It is the desire to avoid this type of downward spiral that drives Reliability Centred Maintenance, particularly for system critical functions. (Sometimes a failure in a piece of equipment is not critical to the operation of the system, so repair on failure is acceptable. eg a light bulb failure when there is sufficient light from surrounding light bulbs to allow operations in the area to continue.)