{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Covers","items":[{"count":1,"name":"Pratt & Whitney JT4A-3&5 series","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-jt4a-3-5-series"}],"relation":"covers"},{"group":"Held by","items":[{"count":null,"name":"Pratt & Whitney Division","note":"","unit":"","url":"https://eflight.com/holders/pratt-whitney-division"}],"relation":"held by"},{"group":"Orders","items":[{"count":9,"name":"FAA orders on these designs","note":"","unit":"airworthiness directives","url":"https://eflight.com/certificates/E-291"},{"count":null,"name":"76-01-08: Tenth Stage Compressor Blade","note":"1976-05-20","unit":"","url":"https://eflight.com/directives/76-01-08"},{"count":null,"name":"71-06-03: Twelfth Stage Compressor Rotor Disc","note":"1971-05-19","unit":"","url":"https://eflight.com/directives/71-06-03"},{"count":null,"name":"71-02-02: Twelfth Stage Compressor Rotor Disc","note":"1971-05-04","unit":"","url":"https://eflight.com/directives/71-02-02"},{"count":null,"name":"68-12-03: High Compressor Rotor Blade Failure","note":"1968-06-12","unit":"","url":"https://eflight.com/directives/68-12-03"}],"relation":"subject to"},{"group":"More","items":[{"count":null,"name":"Every type certificate","note":"","unit":"","url":"https://eflight.com/certificates"},{"count":null,"name":"Who holds what","note":"","unit":"","url":"https://eflight.com/holders"}],"relation":"see also"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"faa_document":"https://drs.faa.gov/browse/excelExternalWindow/9B73F02385CEAED28525670D0061C80E.0001","holder":"Pratt & Whitney Division","id":"E-291","models":["JT4A-11","JT4A-3","JT4A-9","JT4A-10","JT4A-5","JT4A-12"],"name":"Type certificate E-291","product_type":"Engine","type":"certificate","url":"https://eflight.com/certificates/E-291"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}