AD/GA-7/6 - Rudder Bellcrank Torque Tube - Inspection and Modification

Overview

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, mandate the issuance of airworthiness directives to ensure the safety and reliability of aircraft within Australian airspace. This legislation was enacted to address potential safety risks in civil aviation, particularly concerning aircraft design and maintenance. The Civil Aviation Safety Authority (CASA) is the enacting body, with a policy objective of maintaining the highest standards of safety in civil aviation through stringent regulatory oversight. This particular directive applies to Gulfstream (Grumman American) GA-7 series aeroplanes, focusing on the rudder bellcrank torque tube to prevent partial loss of rudder control due to excessive free play. The directive requires inspection and modification within specified timeframes to mitigate safety risks, ensuring the continued airworthiness of these aircraft. The legislation mandates that all model GA-7 aircraft with specific serial numbers must undergo an inspection and, if necessary, modification of the rudder bellcrank torque tube to prevent partial loss of rudder control. Compliance with these directives is essential to uphold the safety standards set forth by CASA, ensuring that any free play in the rudder circuit does not exceed the stipulated limit of 1 degree. The directive references Gulfstream American Service Bulletin No. ME-16, which outlines the required inspection and modification procedures. This legislative measure aims to preemptively address potential safety hazards, thereby enhancing overall aviation safety within Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to all Gulfstream (Grumman American) GA-7 series aeroplanes with serial numbers ranging from GA7-0002 to GA7-0038, GA7-0040, and GA7-0042 to GA7-0087. This regulation mandates the inspection and, if necessary, modification of the rudder bellcrank torque tube to mitigate the risk of partial loss of rudder control due to excessive free play in the rudder circuit. The legislation is applicable within the Commonwealth of Australia and enforces safety standards set by the Civil Aviation Safety Authority (CASA). The directive is intended to ensure that these specific aircraft models meet the required safety benchmarks to maintain airworthiness. This regulation does not specify any exclusions, exemptions, or thresholds within the provided text, but it is understood that compliance must be achieved within 10 hours of time in service after 28 February 1979, as detailed in Gulfstream American Service Bulletin No. ME-16. The application of this directive may be extended or further specified through subordinate instruments issued by CASA.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 and the Airworthiness Directive (AD) AD/GA-7/6, address the inspection and modification of the rudder bellcrank torque tube for Gulfstream (Grumman American) GA-7 Series aeroplanes. This directive applies to all model GA-7 aircraft with serial numbers ranging from GA7-0002 to GA7-0038, GA7-0040, and GA7-0042 to GA7-0087. The aim of this directive is to ensure the airworthiness of the aircraft by preventing partial loss of rudder control, which may occur if free play in the rudder circuit exceeds 1 degree. Compliance with this directive requires an inspection within 10 hours of time in service after 28 February 1979 and subsequent modification as detailed in Gulfstream American Service Bulletin (SB) No. ME-16. Under these regulations, operators of the affected Gulfstream GA-7 Series aeroplanes must ensure that the rudder bellcrank torque tube is inspected and modified as required. This involves a thorough check of the rudder circuit to ascertain that the free play does not exceed the specified limit. If the inspection reveals any deficiencies, the operators must undertake the necessary modifications as outlined in the referenced service bulletin. Operators are required to maintain records of all inspections and modifications performed, and these records must be readily available for review by the Civil Aviation Safety Authority (CASA) upon request. Failure to comply with the AD/GA-7/6 may result in serious safety risks, as partial loss of rudder control can significantly impair the aircraft's ability to maintain control during flight. The regulations impose stringent obligations on aircraft operators to adhere to the specified inspection and modification schedules. Non-compliance can lead to enforcement actions by CASA, which may include fines, suspension of the aircraft's operating certificate, or other regulatory penalties. The potential civil and administrative penalties for failing to comply with airworthiness directives can be severe, underscoring the importance of strict adherence to the requirements set forth in the Civil Aviation Regulations 1998.