AD/LEARJET/21 - Aft Engine Beam - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, is a comprehensive set of regulations designed to ensure the safety and efficiency of civil aviation within Australia. One such regulation is found in Part 39 - 105, which outlines the Civil Aviation Safety Authority Schedule of Airworthiness Directives. Specifically, AD/LEARJET/21 pertains to Gates Learjet 24 & 25 Series Aeroplanes and mandates an inspection of the aft engine beam forward web lightening hole flanges for cracks. This directive applies to all models 25 with serial numbers ranging from 25-266 to 25-300, as detailed in Gates Learjet Service Bulletin 25-298. The policy objective behind this regulation is to enhance aviation safety by proactively identifying and addressing potential structural weaknesses in specified aircraft models. Compliance with this directive is necessary to ensure that the aircraft meet the requisite airworthiness standards.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates that Airworthiness Directives (AD) apply to aircraft operating within the Commonwealth of Australia, ensuring the safety standards set forth by the Civil Aviation Safety Authority (CASA) are met. For Gates Learjet 24 & 25 Series Aeroplanes, the directive AD/LEARJET/21, dated 5/80, concerns the inspection of the aft engine beam forward web lightening hole flanges for cracks. This applies to all model 25 aircraft with serial numbers ranging from 25-266 to 25-300. Compliance with this directive is imperative and must follow the requirements detailed in the document Gates Learjet SB 25-298. The directive is part of CASA's broader mandate to ensure the safety and airworthiness of aircraft within Australian airspace, and any deviation from the specified inspection and maintenance procedures could result in non-compliance with the regulations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, which include directives for specific aircraft models. In this case, AD/LEARJET/21 pertains to the Gates Learjet 24 & 25 Series Aeroplanes, specifically models 25 with serial numbers ranging from 25-266 to 25-300 (section 5/80). This directive mandates an inspection of the aft engine beam's forward web lightening hole flanges for any cracks, with compliance to be determined according to the requirements set out in the Gates Learjet SB 25-298 document. Under the regulations, the primary obligation for the parties governed by this directive is to ensure that the inspection of the specified aircraft parts is conducted meticulously. This involves visual checks and possibly other non-destructive testing methods as outlined in the reference document to identify any signs of cracks or other defects that could compromise the structural integrity of the aft engine beam (section 5/80). The directive explicitly states that these inspections must be carried out as per the requirements specified in the Gates Learjet SB 25-298 document, leaving no room for deviation in the inspection procedures. Failure to comply with these airworthiness directives can lead to severe consequences. The Civil Aviation Regulations 1998 establish that non-compliance with an Airworthiness Directive can result in significant penalties. In the context of AD/LEARJET/21, if an operator fails to conduct the required inspections or if the inspections reveal defects that are not adequately addressed, the consequences could include grounding of the aircraft until the issues are resolved. Additionally, CASA has the authority to impose administrative penalties, which can include substantial fines. The exact penalty amount may vary depending on the severity and frequency of the non-compliance but can be substantial, reflecting the critical nature of maintaining aircraft airworthiness to ensure public safety.