{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":41,"name":"Short Bros SD3","note":"","unit":"registered","url":"https://eflight.com/models/short-bros/sd3#airworthiness"},{"count":6,"name":"Short Brothers Plc SD3","note":"","unit":"registered","url":"https://eflight.com/models/short-brothers-plc/sd3#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Instruments and avionics","note":"","unit":"","url":"https://eflight.com/systems/avionics"}],"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":"1991-10-16","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/D9AAD2C9B461219886256A240047E91E.0001","id":"91-18-13","kind":"AD","name":"Airworthiness directive 91-18-13","published":"","subject":"Pitot/Static Heaters","system":"avionics","type":"directive","url":"https://eflight.com/directives/91-18-13"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}