{"data":{"id":"us/14-cfr-21.129","jurisdiction":"us","citation":"14 CFR 21.129","heading":"Tests: propellers.","body":"Each person manufacturing propellers under a type certificate must give each variable pitch propeller an acceptable functional test to determine if it operates properly throughout the normal range of operation.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND ARTICLES","Subpart F—Production Under Type Certificate"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"5b81a45d2e9cd4347f60b2c35564e5b8c57c06031f58dd69788449bab5d40392","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-21.128","next":"us/14-cfr-21.130"},"notice":"GroundRules: Original legal text. Not legal advice."}