AD/CESSNA 400/34 - Auxiliary Fuel Cells - Inspection and Replacement

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, aim to ensure the safety and efficiency of civil aviation within the country. This legislation is overseen by the Civil Aviation Safety Authority (CASA), which issues Airworthiness Directives to address specific safety issues in aviation. One such directive, AD/CESSNA 400/34, pertains to Cessna 400 Series aeroplanes, specifically targeting the issue of auxiliary fuel cell integrity in Model 411 and Model 421 aircraft equipped with certain types of auxiliary fuel cells. The primary policy objective of this directive is to mitigate the risk of fuel leakage, which could potentially compromise flight safety. This is achieved by mandating regular inspections and replacements of specified auxiliary fuel cells with more reliable alternatives.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority's Schedule of Airworthiness Directives for Cessna 400 Series Aeroplanes, applies to all Model 411 aircraft with serial numbers ranging from 411-0001 to 411-0300 and Model 421 aircraft with serial numbers ranging from 421-0001 to 421B-0048 that are equipped with either Uniroyal Type US-932 or Goodyear Type BTC-39 auxiliary fuel cells, or any subsequent numbered aircraft fitted with these fuel cells as replacements. This regulation is applicable to both Australian and international operators within Australian jurisdiction. The regulations mandate pre-flight inspections of the external lower surface of the wings for any signs of fuel leakage, focusing on rivet heads, inspection covers, and skin lap joints, with any defective fuel cells to be replaced with Goodyear Type BTC-54A fuel cells before further flight. Additionally, Uniroyal Type US-932 fuel cells must be replaced by Goodyear Type BTC-54A fuel cells within 300 hours of time in service or six months after 28 June 1972, whichever comes first. Compliance with these requirements is essential to ensure the airworthiness and safety of the aircraft in operation.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, establishes the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives for the Cessna 400 Series Aeroplanes. Section AD/CESSNA 400/34 pertains to the inspection and replacement of auxiliary fuel cells, particularly for the Model 411 with serial numbers 411-0001 to 411-0300 and Model 421 with serial numbers 421-0001 to 421B-0048. This directive applies to aircraft equipped with Uniroyal Type US-932 or Goodyear Type BTC-39 auxiliary fuel cells, or any subsequent aircraft fitted with these specific fuel cells as replacements. The directive mandates specific actions to ensure the safety of these aircraft during flight operations. The obligations imposed by this directive require the inspection and potential replacement of auxiliary fuel cells. Specifically, for Uniroyal Type US-932 fuel cells, the regulations require that before each flight, the external lower surface of the wings must be inspected for any signs of fuel leakage, with a particular focus on rivet heads, inspection covers, and skin lap joints. If any defects are found in the fuel cells, they must be replaced with Goodyear Type BTC-54A fuel cells before the aircraft is flown again. Additionally, within 300 hours of time in service or six months after 28 June 1972, whichever comes first, the Uniroyal Type US-932 fuel cells must be replaced by Goodyear Type BTC-54A fuel cells. Similar requirements apply to Goodyear Auxiliary Fuel Cell Type BTC-39, where inspections must be conducted before each flight, with defective cells replaced with Goodyear Type BTC-54A fuel cells. A pilot endorsed for the type may perform and certify these inspections. Once the Goodyear BTC-54A cells are installed, these repetitive inspections may be substituted by normal daily inspections. Failure to comply with these directives may result in significant civil or criminal consequences. The specific penalties for non-compliance with the Civil Aviation Regulations 1998 are not detailed within the text of AD/CESSNA 400/34, but generally, violations of CASA regulations can result in fines, penalties, and possible legal actions against the aircraft operator or owner. The severity of these penalties can vary based on the nature and extent of the violation, and CASA may take enforcement actions to ensure compliance with airworthiness directives to maintain the highest safety standards in civil aviation.