{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9696239","patent":{"patent_number":"US-9696239","title":"Method and apparatus for monitoring turbine efficiency of aircraft auxiliary power unit","assignee":null,"inventors":[],"filing_date":"2014-07-23T00:00:00.000Z","publication_date":"2017-07-04T00:00:00.000Z","cpc_codes":["G07C"],"num_claims":12,"abstract":"The present invention relates to a method and device for monitoring performance of an auxiliary power unit (APU) turbine efficiency of an aircraft. The method comprises: obtaining APU messages at multiple time points within a period; obtaining APU startup parameters including at least a rotation speed at a peak of EGT according to the APU messages; calculating a percentage NPA of the rotation speed when the exhausting gas temperature EGT reaches its peak at the APU startup stage relative to the rotation speed in the APU normal operation; calculating the average of the NPA within the period; and determining which of the stable, decline and failure phases the APU turbine efficiency is in according to the average of the NPA."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for monitoring turbine efficiency of aircraft auxiliary power unit","description":"The present invention relates to a method and device for monitoring performance of an auxiliary power unit (APU) turbine efficiency of an aircraft. The method comprises: obtaining APU messages at mult","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9696239","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9696239","citation_suggestion":"Patentable. \"Method and apparatus for monitoring turbine efficiency of aircraft auxiliary power unit\" (US-9696239). https://patentable.app/patents/US-9696239","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9696239","json":"https://patentable.app/api/llm-context/US-9696239","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T16:19:36.726Z"}