COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the 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/IAI-W/23 Brake System Hydraulic Fuse 7/2001
Applicability: Israel Aircraft Industries Ltd. (IAI) 1121, 1121A, 1121B, 1123, 1124 and 1124A series aircraft.
Requirement: 1. Perform a functional test (by measuring fluid loss) for proper operation of hydraulic fuses installed in brake system and emergency hydraulic indicating system in accordance with one of the following, as applicable to the aircraft:
(a) Commodore Jet Service Bulletin (SB) 1121-29-022 for Model 1121, 1121A and 1121B series aeroplanes.
(b) Westwind SB 1123-29-045 for Model 1123 series aeroplanes.
(c) Westwind SB 1124-29-132 for Model 1124 and 1124A series aeroplanes.
If during the inspection required by paragraph 1(a) to 1(c), any discrepancy is found, replace the fuse with a new, improved fuse part number 713047 with suffix “A” after the serial number, prior to further flight.
2. Do not install a hydraulic fuse having part number 713047, unless it has a suffix “A” after the serial number.
Note 1: CAA Israel AD 29-97-03-10 and FAA AD 98-06-10 refer.
Note 2: Replacement of fuse with part number 713047 with suffix “A” after the serial number does not constitute a terminating action for the repeat inspections.
Compliance: 1. Unless previously accomplished, carry out initial inspection within 250 flight hours or 1 year after the effective date of this Airworthiness Directive, whichever occurs first. Thereafter repeat the inspection at intervals not to exceed 1200 flight hours or 3 years, whichever occurs first.
2. From the effective date of this Directive.
This Airworthiness Directive becomes effective on 12 July 2001.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Background: This Directive has been issued to prevent failure of the hydraulic fuse in the event of an external leak downstream of the fuse, which could result in loss of hydraulic system.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 18 May 2001
The above AD is notified in the Commonwealth of Australia Gazette on 13 June 2001.
Overview
The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, address various aspects of civil aviation safety, including the establishment of airworthiness directives to ensure aircraft remain in a safe condition for operation. One such directive, AD/IAI-W/23, issued on 12 July 2001, targets Israel Aircraft Industries 1123 and 1124 (Westwind) series aeroplanes, focusing on the prevention of hydraulic fuse failures in the brake system. This directive was introduced to mitigate the risk of unsafe conditions arising from potential hydraulic leaks, which could compromise the integrity of the hydraulic system and, by extension, the overall safety of the aircraft. The directive requires specific functional tests and replacement of certain fuses, ensuring compliance with established safety protocols and minimising the risk of in-flight failures.
Scope and Application
The Airworthiness Directive (AD) specified under the Civil Aviation Regulations 1998 applies to Israel Aircraft Industries (IAI) series 1121, 1121A, 1121B, 1123, 1124, and 1124A aeroplanes. This AD mandates specific actions to address and mitigate potential safety risks associated with the brake system hydraulic fuses in these aircraft. The directive requires a functional test of the hydraulic fuses installed in the brake system and emergency hydraulic indicating system, as outlined in the respective service bulletins for each model series. If any discrepancies are detected during the inspection, the affected fuse must be replaced with a new, improved fuse bearing a specific part number suffix. The directive also prohibits the installation of certain hydraulic fuses unless they meet specified part number criteria. Compliance with this directive requires an initial inspection within a set timeframe and subsequent inspections at defined intervals. This AD extends to the entire Commonwealth of Australia and is enforced by the Civil Aviation Safety Authority (CASA). It is applicable to all relevant aircraft registered within Australia, ensuring consistent safety standards are maintained across the national aviation sector.
Key Provisions
The Airworthiness Directive AD/IAI-W/23 issued by the Civil Aviation Safety Authority (CASA) under subregulation 39.1(1) of the Civil Aviation Regulations 1998 (CAR 1998) pertains specifically to Israel Aircraft Industries (IAI) 1121, 1121A, 1121B, 1123, 1124, and 1124A series aircraft. This directive mandates a functional test of the hydraulic fuses installed in the brake system and emergency hydraulic indicating system to ensure proper operation. The directive applies to these aircraft models and requires the testing to be conducted according to specified service bulletins for each model: Commodore Jet Service Bulletin 1121-29-022 for Model 1121, 1121A, and 1121B series aeroplanes, Westwind SB 1123-29-045 for Model 1123 series aeroplanes, and Westwind SB 1124-29-132 for Model 1124 and 1124A series aeroplanes. If any discrepancies are detected during the inspection, the fuse must be replaced with a new, improved fuse part number 713047 with a suffix “A” after the serial number before further flight. The directive also prohibits the installation of a hydraulic fuse with part number 713047 unless it has the suffix “A” after the serial number. Additionally, the directive references similar actions taken by the Civil Aviation Authority of Israel and the Federal Aviation Administration.
The Airworthiness Directive imposes several obligations on the operators and maintainers of the affected aircraft. The primary obligation is to perform the required functional test of the hydraulic fuses in accordance with the specific service bulletins relevant to each aircraft model. Operators must ensure that any identified discrepancies are rectified by replacing the fuse with the specified part number. The directive mandates that the initial inspection must be carried out within 250 flight hours or one year from the effective date of the directive, whichever comes first, and subsequent inspections must occur at intervals not exceeding 1200 flight hours or three years, whichever occurs first. Furthermore, the directive specifies that the replacement of the fuse with the improved part number does not constitute a terminating action for the repeat inspections.
The Civil Aviation Regulations 1998, under which this Airworthiness Directive is issued, do not explicitly outline specific offences, penalties, or civil/criminal consequences for non-compliance with the AD. However, failure to comply with an Airworthiness Directive issued by CASA can potentially lead to significant regulatory and safety consequences. Such non-compliance may result in the grounding of the aircraft until the required actions are performed, leading to operational disruptions and financial losses for the operators. Additionally, non-compliance could lead to enforcement actions by CASA, including fines, penalties, and legal proceedings. The precise consequences would depend on the specific circumstances of the non-compliance and the discretion of CASA in enforcing the regulations.