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 CASR 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.
Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes
AD/G1159/42 DC Essential Bus Indication 8/2004
Applicability: Model G-IV series aeroplanes, serial numbers 1000 through 1359 inclusive. Requirement: 1. For aeroplanes equipped with the SPZ 8400 Digital Integrated Flight
Control System, accomplish the following, as applicable:
- If the aeroplane has the production equivalent of Gulfstream IV Aircraft Service Change (ASC) 327, install the new indicator light and the audible tone, in accordance with Gulfstream GIV Customer Bulletin 102B, dated 26 January 2004, together with Modification Instructions A, J through L, and P through S of Gulfstream IV ASC 327B, dated 26 January 2000.
b. If the aeroplane has Gulfstream IV ASC 327 installed, but not Gulfstream IV ASC 327A, install the new indicator light and the audible tone, in accordance with Gulfstream GIV Customer Bulletin 102B; Modification Instructions A through H of Gulfstream GIV ASC 327B Am2, dated 26 January 2004; and Modification Instruction P of Gulfstream IV ASC 327B.
Note 1: Modification Instruction E in Gulfstream GIV ASC 327B Am2 is the same as Modification Instruction P in Gulfstream IV ASC 327B.
c. If the aeroplane has Gulfstream IV ASC 327A installed, ensure that all ground wires from connectors 95A1P2B and 95A2P2B are removed or rerouted in accordance with Gulfstream GIV Customer Bulletin 102B and Figure 6 of Gulfstream IV ASC 327B.
2. For aeroplanes not equipped with the SPZ 8400, accomplish the following, as applicable:
- If the aeroplane does not have Gulfstream IV ASC 327 installed, install the new indicator light and the audible tone, in accordance with Gulfstream GIV Customer Bulletin 102B; together with Modification Instructions A, B through I, and P through S of Gulfstream IV ASC 327B.
b. If the aeroplane has Gulfstream IV ASC 327 installed, install the new indicator light and the audible tone, in accordance with Gulfstream GIV Customer Bulletin 102B, together with Modification Instructions A, M through O, and P through S of Gulfstream IV ASC 327B.
Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes
AD/G1159/42 (continued)
c. If the aeroplane has Gulfstream IV ASC 327A installed, ensure that wire P9052C22 is rerouted and reconnected in accordance with Gulfstream GIV Customer Bulletin 102B and Figure 7 of Gulfstream IV ASC 327B.
Note 2: Page 1 of Gulfstream IV ASC 327B incorrectly refers to Figure 5; Figure 7 is the correct figure.
Note 3: FAA AD 2004-08-08 Amdt 39-13577 refers.
Compliance: For Requirements 1 and 2 - Within 12 months after the effective date of this Directive.
This Airworthiness Directive becomes effective on 5 August 2004.
Background: This Directive requires either the installation of an additional indicator located on the pilot's instrument panel or the use of the EICAS (Engine Instruments/Caution Advisory System) to the flight crew that the aeroplane main batteries are powering the direct current (DC) essential bus. This action is necessary to ensure that the flight crew is aware that an electrical system failure has occurred and that the aeroplane main batteries are powering the essential DC bus. If the flight crew is unaware of this situation, action to stop depletion of the aeroplane batteries will not be taken, and critical communications and navigation equipment could fail.
James Coyne
Delegate of the Civil Aviation Safety Authority 23 June 2004
The above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.
Overview
The Airworthiness Directive (AD) F2006B10046 was issued in 2004 by the Civil Aviation Safety Authority (CASA), an agency under the Australian Department of Infrastructure and Transport, to address an identified safety issue in Gulfstream (Grumman) G1159 and G-IV series aeroplanes. The AD was introduced to rectify an unsafe condition where the flight crew might not be adequately informed when the aeroplane's main batteries are powering the direct current (DC) essential bus due to an electrical system failure. This oversight could potentially lead to critical failures in communications and navigation equipment. The directive mandates specific modifications and installations to ensure the flight crew is aware of such electrical failures, thereby enhancing the overall safety of the aircraft. The AD applies to G-IV series aeroplanes with specific serial numbers and requires compliance within 12 months of its effective date, which is 5 August 2004.
Scope and Application
The Airworthiness Directive issued under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998 applies specifically to Gulfstream (Grumman) G-IV series aeroplanes with serial numbers ranging from 1000 through 1359 inclusive. The directive mandates certain actions to rectify an unsafe condition related to the aircraft's electrical system, specifically ensuring that the flight crew is made aware when the aeroplane's main batteries are powering the direct current (DC) essential bus. This is to prevent critical communications and navigation equipment from failing due to battery depletion. The directive outlines different actions based on the specific configurations of the aircraft, such as the installation of new indicator lights and audible tones or the rerouting and reconnection of specific wires. These requirements must be met within 12 months from the effective date of the directive, which is 5 August 2004. This AD, issued by a delegate of the Civil Aviation Safety Authority, serves to enhance airworthiness standards and ensure the safety of the aircraft and its occupants.
Key Provisions
The main operative sections of the Airworthiness Directive (AD) F2006B10046 (Legislative instrument) pertain to the applicability of the AD to specific aircraft models and serial numbers, as well as the specific actions required to address the identified unsafe condition (section 1). For Gulfstream (Grumman) G1159 and G-IV Series aeroplanes with certain serial numbers, the AD mandates the installation of new indicator lights and audible tones, or the rerouting or removal of certain ground wires, in accordance with specified bulletins and modification instructions. The directive is effective for aeroplanes equipped with the SPZ 8400 Digital Integrated Flight Control System and those not so equipped, with different requirements set out for each scenario (section 2). The compliance deadline is within 12 months from the effective date of the directive, which is 5 August 2004.
The AD imposes specific obligations on the parties or entities it governs, including aircraft operators, owners, and maintenance organisations. These entities must ensure that the required actions are taken on the applicable aircraft within the specified timeframe. This includes, but is not limited to, installing new indicator lights and audible tones, or rerouting or removing specific ground wires, in accordance with the detailed instructions provided in the AD and the referenced bulletins and modification instructions. Failure to comply with these obligations may result in the aircraft being deemed unairworthy, which could lead to significant operational disruptions and potential safety risks.
The AD does not explicitly state any offences, penalties, or civil/criminal consequences for breach; however, the failure to comply with an Airworthiness Directive can lead to serious regulatory consequences under the Civil Aviation Safety Authority (CASA) and the Civil Aviation Act 1988 (Cth). CASA has the authority to issue a Notice of Unauthorized Modification (NUM) or a Notice of Unauthorized Operation (NUO) under section 44 of the Act, which can result in the suspension or revocation of an aircraft's certificate of airworthiness. In the most severe cases, CASA may also refer the matter to the Australian Federal Police for potential criminal prosecution under the Act, with penalties including fines and imprisonment.