{"as_of":"2026-10-08","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":7995,"name":"Cessna 150","note":"","unit":"registered","url":"https://eflight.com/models/cessna/150#airworthiness"},{"count":1637,"name":"Cessna 152","note":"","unit":"registered","url":"https://eflight.com/models/cessna/152#airworthiness"},{"count":232,"name":"Cessna A150","note":"","unit":"registered","url":"https://eflight.com/models/cessna/a150#airworthiness"},{"count":48,"name":"Cessna A152","note":"","unit":"registered","url":"https://eflight.com/models/cessna/a152#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Other and general","note":"","unit":"","url":"https://eflight.com/systems/other"}],"relation":"about"},{"group":"More","items":[{"count":null,"name":"Every FAA order","note":"","unit":"","url":"https://eflight.com/directives"},{"count":null,"name":"Every aircraft system","note":"","unit":"","url":"https://eflight.com/systems"}],"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":{"effective":"1987-10-13","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/B2EF9BEBEA8C200286256A4D00699211.0001","id":"87-21-05","kind":"AD","name":"Airworthiness directive 87-21-05","published":"","subject":"Placard - Spins","system":"other","type":"directive","url":"https://eflight.com/directives/87-21-05"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}