Sample Maintainability Check list (mil-hdbk-470, apdx c)
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The document outlines maintenance and design criteria for equipment bays and compartments in military vehicles, focusing on factors like seal against environmental elements, structural integrity without excessive fasteners, and ease of access for serviceability. It emphasizes the use of specific design features, such as vertical plumbing penetrations and visibility enhancements, to improve maintainability and safety. Additionally, the document provides guidelines for ensuring compatibility and simplicity in equipment mounting and repair.
Sample Maintainability Check list (mil-hdbk-470, apdx c)
- 1. LCSM Tool Maintainability Criteria / Assessment Accessibility Fasteners Human Factors Mating and Connections Standardization and Interchangeability Simplification Modularization Testability and Diagnostics Technique System Testability Design No. Guideline 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.08.01 X General Info & Comments A-01 Seal equipment bays and compartments against the environmental elements including all types of servicing fluids used for the vehicle, all types of anti- ice and de-ice fluids, and all types of fluids used for chemical, biological, or nuclear decontamination. X A-02 Equipment bay and compartment structure should be bonded, co-cured, welded, machined, or combination there of to eliminate or minimize the use of mechanical fasteners. X X X A-03 All equipment bay and compartmental structural flanges and stiffeners should be external to the compartment to maximize the volume available for equipment installation and arrangment. X X X A-04 Use stiffening beads in lieu of flanges to the maximim extent to enhance compartment volume and simplify repairs. Stiffening beads should have the convex surface toward the compartment to eliminate fluid traps. X X A-05 Keep all machined compartment frames, webs, closure panels to a constant thickness (eg not stepped or tapered) to ease simplicity of fluid or electrical penetration and ease simplcity of structural repair. X X A-06 Hardpoints (structural attachment and load bearing areas) within a compartment to assist equipment mounting or support should not be integral with the machined part. Hardpoints should be parasitic ro enable quick repair in case of wear damage in llieu of precise ream/bush repair typical of machined hardpoints. X X A-07 Paint equipment bay and compartment interior a high glosss white to maximize lighting refectivity, visibillity, and rapid leak detection capability. X X A-08 Plumbing penerations into a compartment ahould be on a vertical axis due to difficulty in making or breaking vertically oriented conenctions. When compartment access is from the bottom, vertical oreinted connections can allow fluid to lek onto the maintainer. When access is from the top , such connections can allow foreign matter to enter the line. Use horizontal penetrations whenever possible. X X X A-09 Any heat or temperature sensitive within a compartment should contain heat-sensitive tape or appropriate heat sensor for easy indication of over- temperature excursions. X X A-10 Provide a sufficient number of compartment fluid drains to ensure fluid drainage for varying aircraft static altitudes and varying terrain slopes for ground vehicles. X X X A-11 Locate compartment electrical penetrations close to the access opening for ease of sight, probing, repair, and to eliminate fluid soaking, wicking and contamination. X X X A-12 Locate compartment electrical penetrations far enough away from the access opening to prevent damage resulting from improper (over-length) panel fasteners. X X X A-13 Two-sided or two-surfaced access should not be required for access to equipment interfaces and hardpoints. The term two-sided infers top/bottom, left/right, front/back, or combination thereof. X X X A-14 Do not locate nutplates or gang channels in an inaccessible areas that would require extensive disassembly or equipment removal to gain access. X X X A-15 Locate tie-down attachment points such that tie-down chains , straps, or cables, do not prevent or restrict normal servicing, weapon loading, or safe/arm functions. X X X A-16 Structural design should provide good access to corrosion-prone areas for inspection or treatment. X X X A-17 All structural fasteners in an acces door or panel should be of identical grip and diameter. In rare case where this is not possible, fasteners if different grip must have different diameters to prevent a shorter fastener being substituted for the correct, longer fastener. X X X A-18 Use transparent windows, quick opening covers, or openings without any cover to permit quick visual inspections where neeeded. X X X LCN: AAAGAF WUC: 1601 Score Dwg No. Rev Dwg Description/Name Date: 10/25/2006 Engineer: Tommy Jacyszyn 12345 Radio, VHF/UHF and Satcom Update: Engineer: NHA Dwg No. Rev NHA Dwg Description/Name 123 CNI Systems Weight Coating MTBF FR MTTR Dimensions 8 Lbs Zinc Oxide 25,000 40.00 0.25 FH 10" x 8" x 1.75" 12345-101 PN: 3.86 Material Name: Wildfire Radio AL System Sub-System/LRU UHF CommCNI System File: Maintainability CheckList (MIL-HDBK-470, Apdx C) ver 2h.xls Tab: Guidelines (2) Page 1 of 2 Pages