Aeronautical Design Standard (ADS) Handbook- Qualification Requirements and Identification of Critical Characteristics for Aircraft Engine Components

Keywords identification of critical characteristics for aircraft engine qualification requirements

1.3.1 General
The ETTs, in the FSPIS, provides lists of engine parts, components, and assemblies with the qualification requirements an alternate source must meet before that source can be approved to manufacture the component. Production components must be manufactured by the alternate source using the same facilities, equipment, and procedures that were used to manufacture the substantiation test articles (see paragraph 1.3.6). Requirements listed for assemblies include all requirements listed for parts and components used in that assembly. The alternate source must certify they have a quality program established which meets the requirements of MIL-I-45208 or a comparable higher-level non-government quality system before qualification testing may commence. (Mandatory 100% inspection in accordance with MIL-Q-9858A requires a waiver.) This certification should be submitted as part of the inspection report.

1.3.2 Source Control Drawings
Source Control Drawings (SCD) list those sources that are qualified to produce that particular component. The alternate source must satisfy all requirements specified by the SCD, any associated procurement specification, and requirements specified herein in order to be approved. Any duplication of requirements may be ignored. A test plan for substantiating compliance with SCD requirements must be submitted to USAATCOM engineering for approval prior to testing. The required Design Qualification Testing must be performed as a “Pre-qualification Test” since each vendor provides an entirely different design.

1.3.3 Dimensional Substantiation
All drawing dimensions, limits, and tolerances must be adhered to. All components listed in the attachments and used for testing in accordance with this document must require substantiation of all drawing dimensional requirements. The results of this dimensional substantiation should be included in the inspection report and submitted to USAATCOM engineering for approval (see paragraph 1.3.8).

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Potential alternate manufacturing sources of aircraft engine parts, components, or assemblies are required to provide substantiation that the specific item offered meets or exceeds the identical item furnished by the original manufacturer in terms of service life, strength, durability, form, fit, and function. The substantiation requirements for alternate manufacturing source approval are included in this document. Candidates for alternate source approval are required to submit to Army Aviation and Troop Command (USAATCOM), Engineering Directorate a plan designed to meet the substantiation requirements. The USAATCOM Engineering Directorate will review the plan to insure that the proposed testing is sufficient to determine that the item to be manufactured will be equivalent to the original. The Engineering Test Table (ETT) in the Flight Safety Parts Information System (FSPIS) lists the testing that is normally required for alternate sources which use material, castings, forging, and process sources approved by the prime contractor or government for the item in question. Flight Safety Parts (FSP) and critical characteristics are identified. A potential alternate manufacturing source requesting approval is required to submit written substantiating data on a part, component, or assembly to become a qualified vendor. This data should include, but not limited to, thecandidates capability to manufacture the item, a manufacturing plan (including sources for forging, castings, etc.), and a test plan to satisfy engineering test requirements.

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