On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001 (1) of CASR. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
AD/CESSNA 400/121 | Wing spar lower cap inspection and modification | 2026Applicability:All Textron Aviation Inc (Type Certificate Previously held by Cessna Aircraft Company) (Cessna) aeroplanes listed below that are not maintained in accordance with Cessna’s SID program.Models: 401, 401A, 401B, 402, 402A, 402B, 402C, 411, 411A and 414ARequirements:Subject to Requirement 3, models 401, 401A, 401B, 402, 402A, 402B, 411 and 411A must comply with FAA AD 2005-12-12 as if FAA AD 2005-12-12 were an airworthiness directive under paragraph 39.001A(b) of CASR.Subject to Requirement 3, models 402C and 414A must comply with FAAAD2005-12-13, as if FAA AD 2005-12-13 were an airworthiness directive under paragraph 39.001A(b) of CASR.Model 402, 402A, 402B and 402C aircraft with the Hawker de Havilland (HDH) Australia spar strap are not required to comply with Requirement 1 or Requirement 2 (as applicable), if the aircraft remains on the inspection program in accordance with HDH EO 006-035.Note 1: FAA AD 2005-12-12 and AD 2005-12-13 are published at <Airworthiness Directives | Civil Aviation Safety Authority>. They are also available on the FAA Dynamic Regulatory System.Note 2: CASA has issued Airworthiness Bulletins AWB 57-021 and AWB 57-016 in relation to HDH EO 006-035. AWB 57-016 applies only to Model 402C with the HDH EO 006-035 ‘Wing Main Spar Strap Modification’.Compliance: | This AD commences on 18 April 2027.Background:AD/CESSNA 400/40 Amdt 14 was repealed in October 2026 (refer CASAADCX005/26 - Fatigue Life Limitation Airworthiness Directives Repeal Instrument 2026).While AD/CESSNA 400/40 Amdt 14 was identified as imposing a range of requirements unique to Australia, it also had some requirements that were derived from FAA AD 2005-12-12 and FAA AD 2005-12-13.This AD, in effect, mandates the requirements of FAA AD 2005-12-12 and FAA AD 2005-12-13, noting these were issued by the FAA before 1 October 2009 and, therefore, are not automatically accepted in Australia under paragraph 39.001A(b) of CASR.Cessna Model 402 aircraft that comply with the requirements of HDH EO 006-035 are exempt from the requirement to comply with the relevant FAA AD as this is considered an acceptable alternative to the Cessna spar strap modification in those FAA ADs.This AD also does not apply to aeroplanes maintained under Cessna’s SID program, as this is another way of managing airworthiness of these aircraft.[Signed P. Spence]Pip SpenceDirector of Aviation SafetyCivil Aviation Safety Authority22 October 2026