1、I NOT MEASUREMENT SENSITIVE MIL-STD-91 I (MC) B-Nember 2, 1992 MILITARY STANDARD e PRINCIPLES OF INSPECT, REPAIR ONLY AS NECESSARY (IROAN) PROCEDURES AND PREPARATION OF IROAN PUBLICATIONS 1 N/A AREA SDMP Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
2、,-FOREWORD The United States Marine Corps is committed to reduction of equipment maintenance costs, while maintaining combat essential equipment in a high state of readiness. This can be accomplished by designing products of dependable and maintenance-free materials and utilizing more effective main
3、tenance procedures and extended maintenance intervals where applicable. maintenance free materials and equipment is cost prohibitive; therefore, the use of more effective maintenance procedures is the preferred method. procedures enables military equipment of modern design and materials to be mainta
4、ined in a serviceable condition throughout their expected life cycle. Simply stated, the Inspect and Repair Only As Necessary (IROAN) concept is a method of performing the minimum depot level scheduled maintenance necessary to keep equipment items in a “serviceable condition“. Manufacturing Applicat
5、ion of proper maintenance ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-STD-91621 W 79999Lir 0384432 b3 W MIL-8TD-91621 (MC) CONTENTS PARAGRAPH PAE 1 . SCOPE. 0 . 1 1.1 1.2 1.3 Scope . 1 Applicability . 1 Tailoring . 1 2 . APPLICABLE DOCUMEN
6、TS . 1 2.1 2.1.1 2.1.2 2.2 Government Documents . 1 Specifications and standards . 1 Other Government documents. drawings. and publications . 3 Order of Precedence 3 3 . DEFINITIONS . . . . . . . 0 4 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 Characteristic 4 Condition Code A . 4 Critical defect
7、4 Defect 4 Energize . 4 IRO. . 4 Majordefect . 4 Minordefect . 4 Rebuild 4 Reliability Centered Maintenance (RCM) 4 Unclassified defects . 5 4 . GENERAL REQUIREMENTS . 5 4.1 4.1.1 4.1.2 4.1.3 4.2 4.2.1 4.2.3 4.2.4 4.2.6 4.2.7 4.3 4.3.1 4.3.1.1 4.3.1.2 4.3.2 4.3.3 4.3.3.1 4.3.3.2 4.3.3.3 4.3.3.4 Item
8、 selection for IROAN program . 5 Midpoint of item operational life . 6 Prior to midpoint . 6 After midpoint 6 Rebuild Standards . 6 General 6 Instructions for use of the illustrated parts breakdown . 7 inspection of parts 7 Final inspection and acceptance testing 7 General inspection requirement 7 Q
9、uality Assurance . 8 Responsibility 8 Nondestructive inspection . 8 Welding inspections 8 Inspection forms. reports. and records 8 Inspection requirements 8 Preinduction check 8 Prerepair inspection . 9 Component inspection . 9 In process assembly inspections 9 iii Provided by IHSNot for ResaleNo re
10、production or networking permitted without license from IHS-,-,-4.3.3.5 5 . 5.1 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.2.5 5.2.5.1 5.2.5.2 5.2.5.3 5.2.6 5.3 5.3.1 5.3.2 5.3.3 5.3.3.1 5.3.3.2 5.3.3.3 5.3.3.4 5.3.3.5 5.3.3.6 5.3.3.7 5.3.3.8 5.4 5.4.1 5.4.2 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 5.15 6 .
11、6.1 6.2 6.3 6.4 6.5 MIL-8TD-91621 (MC) Final inspection . 9 DETAILED REQUIREMENTS FOR PREPARATION OF IROAN PUBLICATIONS 9 General 9 Basic IROAN document . 10 Coverpage 10 Record of changes . 10 Table of contents . 10 Safety summary 10 Statement of the Scope. Purpose and Requirement 10 Scope . 10 Pur
12、pose 10 IROAN requirements 10 IROAN flow chart . 10 IROAN Instruction . 10 Heading 10 Table of contents for the Section . 10 IROAN description . 10 Scope . 10 Applicable Standards . 10 IROANPhases . 11 Special equipment . 11 Test procedures 11 Pass/Fail . 11 Mandatory replacement parts 11 Finishing
13、. 11 Safety 11 Safety during testing . 11 Safety marking 11 inspection 11 Mandatory parts replacement under the IROAN concept of maintenance 12 Disassembly 12 Serviceability 12 Repair/replacement 12 Defects 12 Corrosion . 13 Operational 13 Inspection of parts 13 Configuration . 13 Final acceptance r
14、ecord 13 NOTES . 14 General 14 Intendeduse . 14 Tailoring guidance 14 Technical manual acquisition . 14 Subject term (key word) listing 14 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-93623 E 9999933 0384434 V4b D t 0 I . I i i. I I I i
15、. i 1 1 1 1 2 2 3 3 3 4 5 6 7 8 9 10 10 11 12 12 13 14 MIL-8TD-91621 (MC) Sample Checklist (Sheet 1 of 4) Sample Checklist (Sheet 2 of 4) Sample Checklist (Sheet 3 of 4) Sample Checklist (Sheet 4 of 4) Sample Repair Concept (Sheet 1 of 2) Sample Repair Concept (Sheet 2 of 2) Sample Repair Procedures
16、 (Sheet 1 of 3) Sample Repair Procedures (Sheet 2 of 3) Sample Repair Procedures (Sheet 3 of 3) Sample Title Page Sample Record of Changes Sample Table of Contents Sample Safety Summary Sample Example of Basic Introduction Chapter Sample Flow Plan Sample Major Assembly Chapter (Sheet 1 of 2) Sample
17、Major Assembly Chapter (Sheet 2 of 2) Sample of Special Equipment List Sample Engine Run-In Data Sheet (Sheet 1 of 2) Sample Engine Run-In Data Sheet (Sheet 2 of 2) Sample Test Procedures Example of Detail Finishing Procedures V Provided by IHSNot for ResaleNo reproduction or networking permitted wi
18、thout license from IHS-,-,-MIL-STD-%Lb23 m 9999933 0384435 382 m MIL-8TD-91621 (MC) 1. SCOPE 1.1 ScoDe. This military standard addresses the Inspect, Repair Only As Necessary (IROAN) procedure, presents guidelines for establishing an IROAN program, and sets the criteria for developing the IROAN stan
19、dards publication. IROAN is defined as “That maintenance technique which determines the minimum repairs necessary to restore equipment, components, or assemblies to prescribed serviceability standards by utilizing all diagnostic equipment and test procedures in order to minimize unnecessary disassem
20、bly and parts replacement“. shall be met to ensure excellent operating capability. This is done, in part, by utilizing all available diagnostic equipment and test procedures to eliminate unnecessary disassembly and parts replacement. IROAN standards are constructed to provide guidance for scheduling
21、 depot level repair and are utilized in conjunction with depot repair standards and/or depot maintenance work requirements (DMWR). Serviceability standards 1.2 Amlicabilitv. This standard is applicable to the U.S. Marine Corps and its contractors and is available for use by all Departments and Agenc
22、ies of the Department of Defense, Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, MARCORSYSCOM, Program Support Directorate (Code PSE-P), 2033 Barnett Avenue, Suite 315, Quantico, Vir
23、ginia 22134-5010. Utilize the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or submit comments by letter. 1.3 Tailorinq. When developed by the prime hardware contractor, the IROAN standards shall be developed concurrently with the d
24、epot repair standards and become an integral part of the equipment maintenance publications, Maintenance Instruction, Repair Parts List (Organizational, Intermediate and Depot (-25tP) or a separate supplement, as appropriate. If IROAN standards were not developed during the initial procurement of th
25、e hardware, they shall supplement the existing rebuild standard in order to avoid duplication of effort. 2. APPLICABLE DOCUMENTS 2.1 Government Documents. 2-1.1 Specifications and standards. The following specifica- tions, standards, and publications form a part of this document to the extent specif
26、ied. Unless otherwise specified, the issues of these documents shall be those listed in the effective issue of the Department of Defense Index of Specifications and Standars (DODISS) and supplement. Hard copies of DODISS are available from the Superintendent of Documents, U.S. Government Printing Of
27、fice, Washington, DC 20402-0001 or through the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-91621 = 9999911 0384436 219 HIL-STD-91621 (MC) Director, Naval Publications and Printing Service Office, 7000 Robbins Avenue, Philadelphia, PA 1911
28、1-5093 for microfiche. MILITARY SPECIBICATIONS MIL-M-38784 MIL-P-38790 MIL-1-45607 MIL-A-85045 MILITARY STAMDARDS MIL-STD-12 MIL-STD-410 MIL-STD-453 MIL-STD-454 MIL-STD-721 MIL-STD-1265 MIL-STD-1309 MIL-STD-1949 MIL-STD-6866 MIL-STD-45662 YILITARY PBLICATIONS TM-9-214 Manuals, Technical: General Sty
29、le and Format Requirements Printing Production of Technical Manuals, General Requirements for Inspection Equipment, Acquisition, Maintenance, and Disposition of Cable Fiber Optic (Metric), General Specification for Abbreviations for Use on Drawings, and in Specifications, Standards, and in Technical
30、 Documents Nondestructive Testing Personnel, Qualification and Certification (Eddy current, liquid penetrant, magnetic particle, radiographic, and ultrasonic) Inspection, Radiographic Standard General Requirements for Electronic Equipment Definitions of Terms for Reliability and Maintainability Radi
31、ographic Inspection, Classification and Soundness Requirements for Steel Castings Definition of Terms for Test, Measurement, and Diagnostic Equipment. Inspection, Magnetic Particle Inspection, Liquid Penetrant Calibration System Requirements Inspection and Care/Maintenance of Anti-Friction Bearings
32、STE/ICE (Standard Test Equipment/Internal Combustion Engine) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TM-750-245-4 TM-3080-50 TM-4750-15/1 TM-4750-15/2 TI-4733-15/1 Naval Ship 0900-003-8000 Naval Ship 0900-003-9000 MCO P3900.13 MCO P4400.82
33、MCO 4855.2 MCO P5215.17 Defect Classification Guide Corrosion Control Procedures, Depot Maintenance Activities for Marine Corps Equipment Painting and Registration for Marine Corps Combat and Tactical Equipment Camouflage Paint Patterns Calibration Procedures Inspection of Welds Inspection of Welds
34、Systems Engineering Manual Marine Corps Unified Material Management System Marine Corps Quality Program Marine Corps Technical Publications NONGOVERNMENT PUBLICATIONS ANSI B46.1 1962 American National Standards Institute 2.1.2 Other Government documents, drawinss, and mblications. The following othe
35、r government documents, drawings, and publications form a part of this specification to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. U.S. Government Printing Office Style Manual, Library of Congress Catalog No. 2253.U58
36、 The GPO Style Manual is available from the Superintendent of Documents, U.S. Government Printing Office, Washington DC 20402- 0001. Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Naval Publications and Forms Center (ATTN: N
37、PODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5900. Marine-Corps Orders (MCO) are available through Commandant of the Marine Corps (Code ARE-B), Washington, DC 20380-0001. 2.2 Order of Precedence. In the event of a conflict between the text of this document and the references cited, the text of t
38、his document takes precedence. Nothing in this document supersedes 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-91621 (MC) applicable laws and regulations unless a specific exemption has been obtained. 3 DEFIIJITIOIJB 3.1 Characteristic.
39、 Any dimensional, visual, functional, mechanical, electrical, physical, or material feature or property; or any control element which describes or establishes the design, fabrication, and operational requirements of an article or material. 3.2 Condition Code 9. New, used, repaired or reconditioned m
40、aterial which is serviceable and issuable to all customers without limitation or restriction. 3.3 Critical defect. A critical defect is a defect that judgement and experience indicate is likely to result in hazardous or unsafe conditions for the individual using, maintaining, or depending upon the p
41、roduct; or a defect that is likely to prevent the operational availability of an end item. 3.4 Defect. A defect is any identifiable nonconformance of a specified characteristic. 3.5 Eneraize. To activate a system utilizing the means necessary to place the item in a condition for testing. 3.6 IROAN.
42、That maintenance technique which determines the minimum repairs necessary to restore equipment, components, or assemblies to prescribed serviceability standards by utilizing all diagnostic equipment and test procedures in order to minimize disassembly and parts replacement. Items will be restored to
43、 Condition Code A. 3.7 Major defect. A major defect is a defect, other than critical, that is likely to result in failure or materially reduce the usability of the product for its intended purpose. 3.8 Minor defect. A minor defect is not likely to materially reduce the usability of the product for i
44、ts intended purpose, or is a departure from established standards having little bearing on the effective use of the unit. 3.9 Rebuild. The restoration of an item to a standard as near as possible to its original condition in appearance, performance and life expectancy. 3.10 Reliability Centered Main
45、tenance (RCMI. A maintenance concept that employs an analytical methodology to identify the components of a hardware system and influences the decision- making in determining the minimum amount and type of maintenance that must be accomplished in order to maintain or restore design levels of reliabi
46、lity. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-9Lb2L m 999923 0384439 T28 m MIL-STD-9 162 1 (MC) 3.11 Unclassified defects. Any defect having no effect on function, safety, interchangeability or life, but is a departure from good wor
47、kmanship will be noted in writing. 4. 0- REQUIREMENTS 4.1 Item selection for IROAN Droaram. Traditionally, vehicles/components were nominated for the rebuild (R that is the cost of repairs to restore the item to Condition Code A does not exceed the maximum limits imposed by current Marine Corps dire
48、ctives. It is the specific intent of this standard to permit maximum flexibility to operational commanders in the selection of candidates for IROAN so as to maintain maximum equipment availability at minimum support costs. An item may become a candidate for IROAN at any Provided by IHSNot for Resale
49、No reproduction or networking permitted without license from IHS-,-,-NIL-STD-71b21 m 9999911 O384440 74T m MIL-STD-91621 (MC) time during its life cycle if it meets one of the following criteria. 4.1.1 Midpoint of item operational life. The midpoint of item operational life is determined by the approved operational requirements document that justified the procurement. This can be
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