{"as_of":"2026-10-30","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":238,"name":"Learjet 60","note":"","unit":"registered","url":"https://eflight.com/models/learjet/60#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Heating, ice protection and utility systems","note":"","unit":"","url":"https://eflight.com/systems/utility"}],"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":"1993-12-15","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/50BAD3DAF85B8E78862569890076F33A.0001","id":"93-23-12","kind":"AD","name":"Airworthiness directive 93-23-12","published":"","subject":"Heating Systems","system":"utility","type":"directive","url":"https://eflight.com/directives/93-23-12"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}