Phase II – This phase specifies the definitions, guidances, andappraisals given in Section 1.1 for those instances where ARINC 600LRUs are of a design catering to mechanical, electrical, andenvironmental control that is substantially beyond those featuresfor Phase I. Phase II, therefore, is another step in theevolutionary development of avionic installations. It is intendedto enhance the operator’s satisfaction with avionics built to andinstalled in accordance with Phase II specifications. Thissatisfaction is meant to encompass life cycle cost, reliability,maintainability, etc. As with Phase I and ARINC 404/404A, it islikely that aircraft manufacturers will find it necessary(convenient) to sometimes mix Phase II LRUs and Phase I LRUs in thenew rack. When this is done, the installation criteria for Phase Iwill prevail. However, it will not be proper to install Phase IILRUs in ARINC 404/404A shelves since these shelves will not be ableto meet certain Phase II requirements. The standard rule is, asstated above, always install a mix of LRU phases in thelower-numbered phase shelf/cabinet and no more than two phases maybe mixed on one shelf. Put differently, a Phase N + 1 LRU can beused in (and only in) a Phase N or a Phase N+ 1 Rack/Cabinet.Similarly, a Phase N LRU can be used only in a Phase N or Phase N -1 Rack/Cabinet.
- Edition:
- 10
- Published:
- 02/16/2010
- Number of Pages:
- 298
- File Size:
- 1 file , 3.6 MB
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