Download - Reliability Centered Maintenance (RCM) Analysis

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Stracener_EMIS 7305/5305_Spr08_04.10.08

Reliability Centered Maintenance (RCM) Analysis

Dr. Jerrell T. Stracener, SAE Fellow

Leadership in Engineering

EMIS 7305/5305Systems Reliability, Supportability and Availability Analysis

Systems Engineering ProgramDepartment of Engineering Management, Information and Systems

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• RCMA is a disciplined approach to determine systems Preventive Maintenance (PM) programs.

• Candidate items are selected for analysis as early as possible, and re-applied when needed.

• For each item, an attempt is made to identify potential failures that are correlated with usage or time passage.

• PM tasks may result, depending on criticality and feasibility.

• Calculated intervals for identified PM tasks are determined using the best-known life characteristics.

• Results are documented.

Introduction

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Introduction

•Approach–History of requirements documents–Key Tenets–Conclusions

•Sources of information–WWW–Military standards/handbooks–Journal articles–Experience

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Commercial Documentation History

•MSC-1 (1968, by Boeing Maintenance Steering Group, to support 747 scheduled maintenance program)

•MSC-2 (1970, by (ATA) Air Transport Association (ATA) of America and task force of appropriate stakeholders, to support other A/C)

•Reliability-Centered Maintenance, Stan Nowlan and Howard Heap, 1978

•MSG-3 (published by the ATA in 1980 to support more-complex A/C, like the 757/767, and address more-stringent FAA regulations and economic issues) Latest revision 2001.

•SAE JA1011 (1999) and JA1012 (2002) are “sister” specs

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Military Documentation History

•Early efforts used commercial docs/reqts

•DA PAM 750-40 (USA 1980)

•MIK-HDBK-266 (DOD 1981)

•MIL-STD-1843 (USAF 1985 (cancelled 1995, no superseding doc.))

•MIL-STD-2173 (USN 1986 (cancelled 1999))

•MIL-STD-2173(AS) (USN 1998 (cancelled 1999))

•NAVAIR-00-25-403

•Late efforts tend to use commercial docs/reqts

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Key Tenets

•“This process can only address maintenance preventable failures, i.e. it cannot defend against unlikely events, non-predictable acts of nature, etc. ” Wikipedia

•Candidates are identified early in a development using Failure Modes and Effects Analysis (FMEA).

•Each FMEA candidate is subjected to RCMA. An example of early Army RCM logic tree attached at end of this package.

•RCMA can be used with Failure Modes, Effects, and Criticality Analysis (FMECA) per MIL-STD-1629 to identify and assign criticality to potential failures.

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Key Tenets (cont)

•Results are documented in some fashion. -Existing tool-In-house tool

•Logistics Support Analysis Record (LSAR) is a formal data documentation process that can be used to collect results of RCM logic application.

-See cancelled MIL-STD-1388-2B -Tools developed per US MIL-STD-1388-2B or MoD 00-60 can be used rather than developing an in-house tool.

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Key Tenets (cont)

•Application of RCMA may result in: -Servicing Task-Lubrication Task-On-Condition (scheduled inspection) Task-Hard-Time (scheduled removal) Task-Failure-Finding (scheduled inspection of hidden function) Task-No PM Task (if “No PM Task” is unacceptable, then redesign, operational restrictions, change in maint procedures, etc., may be necessary). -Age Exploration

•In short, RCMA results in a PM task of some type, system redesign, or an item is allowed to fail.

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Conclusions

•Generally applied to aircraft and power plant acquisitions.

•Generally not applied to US acquisitions that are not new significant systems.

•Applied more heavily to smaller acquisitions by UK, Australia, New Zealand, Korea, ROC

•RCMA is generally not applicable to electronic items. It applies to items that have increasing failure rate over time, or have inherent wear-out characteristics.

•In personal experience, it has not been rigorously applied to any small US system since approximately 1994.

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• Websites- http://assist.daps.dla.mil/quicksearch- http://logistics.navair.navy.mil/rcm/library- http://www.mtain.com/logistics- http://logistics.navair.navy.mil/rcm- Wikipedia

• Documents- MIL-STD-2173, MIL-STD-2173(AS) RCM (cancelled)- NAVAIR-00-25-403 RCM- MIL-STD-1388-2B LSAR- MIL-STD-1629 FMECA- Logistics Spectrum, Apr-Jun 2002, Richard W. Anderson

References

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Reference: NAV-00-25-403 (Navy)

RCM Process Diagram

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Reference: DA PAM 750-40 (Army). Detailed use instructions are provided (1982).

RCM Logic Diagram

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Full RCM Program Task Sequence Flowchart

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Full RCM Program Task Sequence Flowchart (cont)

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Collecttest and in-service data

STEP 28

Does new data support current FMECA and RCM entries?

STEP 29

Go toSTEP 6

Go toSTEP 28

F

ImplementPM tasks

STEP 27

NONOYES


NAVAIR RCM website: http://logistics.navair.navy.mil/rcm/guidance.cfm.

Download - Reliability Centered Maintenance (RCM) Analysis

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