AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/INST/49 and issues the following 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.
Instruments and Automatic Pilots
AD/INST/49
Amdt 1
Rockwell Collins Air Data Computers 6/2003
Applicability: All Rockwell Collins air data computers (ADC) listed below; except ADC-85A computers part number 822-0370-113 or -123 with Rockwell Collins Service Bulletin (SB) 58 incorporated and installed on Saab 340 series aeroplanes.
Unit | Part Number | Serial Number |
ADC-85 | 622-8051-002 | All units |
(Incorporating Rockwell Collins | 622-8051-003 | |
Service Bulletin (SB) 58) | | |
ADC-85A | 822-0370-113 | All units |
(Incorporating SB 58) | 822-0370-123 | |
| 822-0370-139 | |
| 822-0370-404 | |
| 822-0370-408 | |
ADC-850D | 822-0389-133 | All up to and including |
(Incorporating SB 58) | | 3DGW (except for 1P6D, 22RC-22RF and 23WK- |
| | 3DGP) |
ADC-850F | 822-1036-406 | All Units |
| 822-1036-418 | |
Note 1: These ADCs may be installed on, but not limited to, the following aeroplanes:
ADC-85/ADC-85A
ADC-850D ADC-850F
Astra AIA
Chinese Y7 and Y8 Czech LET-610 DC-8
Falcon 20F Piaggio P-180
Raytheon B200, B300, C90A and 1900D Lear 60
Falcon 20, 50 and 50EX
Requirement: 1. Unless already accomplished, carry out the following actions in accordance with
Rockwell Collins SB 62, (ADC-85/85A/850C/850D/850E/850F-34-62), Revision No. 2, dated 7 March 2000, or SB 62, dated 25 October 1999, as applicable, together with the applicable Collins Computer Component Maintenance Manual and Collins Avionics Standard Shop Practices Instruction Manual:
- Remove any affected ADC from the aeroplane.
b. As applicable, replace or reprogram parts or circuit card assemblies on central processing unit (CPU) circuit cards.
c. Test the ADC.
2. Affected ADCs may not be installed on any aeroplane, except Saab 340 series aeroplanes, unless the modification and test required by Requirement 1.b. and c. have been accomplished.
Note 2: Rockwell Collins Operator Bulletin 99-7, dated August 1999, contains information about an operational placard to install until accomplishment of the actions of this Directive. While not necessary to address the unsafe condition in this Directive, CASA highly recommends that the placard be installed.
Note 3: FAA AD 2002-14-19 Amdt 39-12819 and FAA Special Airworthiness Information Bulletin CE-03-21 refer.
Compliance: For Requirement 1 - Remains unchanged as ‘Within 12 months after the effective date of the original issue of this Directive’.
For Requirement 2 - As of the effective date of this Amendment. This Amendment becomes effective on 12 June 2003.
Background: The original issue of this Directive required replacement of any affected ADC with one that has a reprogrammed and tested CPU circuit card and circuit card assembly. The Directive was issued following a flight test that showed that these ADCs could display an unwarranted ADC flag in response to the aeroplane's "Normal/Alternate Air" static source selection capability. This could cause the flight crew to react to this incorrect flight information and possibly result in an unsafe operating condition.
This Amendment is issued following advice from the United States Federal Aviation Administration that Saab 340 series aeroplanes were not affected.
The original issue of this Directive became effective on 5 September 2002.
Jim Coyne
Delegate of the Civil Aviation Safety Authority 1 May 2003
The above AD is notified in the Commonwealth of Australia Gazette on 21 May 2003.
Overview
The Civil Aviation Safety Authority (CASA) introduced an Airworthiness Directive (AD) to address safety issues associated with Rockwell Collins air data computers (ADC) used in various aircraft models. Enacted in 2003, this legislation aimed to ensure the safe operation of aircraft by rectifying potential unsafe conditions related to these ADCs. The AD mandates specific actions to be taken to mitigate risks, such as removing affected ADCs from aeroplanes, replacing or reprogramming parts, and testing the ADCs, all in accordance with Rockwell Collins Service Bulletin 62 and other relevant maintenance manuals. This directive is a response to findings that certain ADCs could display erroneous information, potentially leading to unsafe operating conditions. The AD applies to specific models and serial numbers of Rockwell Collins ADCs, excluding those already modified according to certain service bulletins. CASA issued this directive to ensure compliance with safety standards and to prevent any unsafe conditions that could arise from the operation of these affected ADCs.
Scope and Application
The Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Safety Regulations 1998 pertains to specific Rockwell Collins air data computers (ADC) installed in various aircraft models. This directive applies to all Rockwell Collins ADC units listed in the applicability section, except for ADC-85A computers with specific part numbers that have already incorporated Rockwell Collins Service Bulletin (SB) 58, and those installed on Saab 340 series aeroplanes. The directive mandates specific actions to address safety concerns associated with these ADCs, including the removal and replacement or reprogramming of parts, and testing of the ADCs, to be performed in accordance with Rockwell Collins Service Bulletin 62. The directive is effective within 12 months of its original issue and requires compliance immediately upon the effective date of the amendment. The AD's scope is limited to the specified Rockwell Collins ADC units and excludes those that have already been modified as per the noted service bulletins. The directive applies nationally within the Commonwealth of Australia, as it is published in the Commonwealth of Australia Gazette.
Key Provisions
The primary sections of this Airworthiness Directive (AD) include the applicability, requirement, and compliance sections. The applicability section (paragraph 4) specifies which Rockwell Collins air data computers (ADC) are subject to this directive, excluding certain models and serial numbers. The requirement section (paragraph 5) mandates actions to be taken, such as removal, replacement or reprogramming of parts, and testing of the ADC, to address identified safety issues. Lastly, the compliance section (paragraph 10) sets deadlines for these actions, with the primary requirement needing to be completed within 12 months from the original issue date of this directive, and another requirement needing to be fulfilled as of the effective date of this amendment.
The obligations imposed by this AD are detailed and specific, requiring operators to remove affected ADCs from their aeroplanes, replace or reprogram parts as necessary, and conduct thorough testing. These obligations are designed to ensure that the identified safety issues are effectively addressed, thereby enhancing the overall airworthiness of the affected aircraft. Operators must also ensure that affected ADCs are not reinstalled on any aeroplane, except Saab 340 series aeroplanes, unless the specified modifications and tests have been completed. This mandate underscores the importance of adhering to the detailed procedural steps outlined in Rockwell Collins Service Bulletin 62 and other relevant maintenance manuals.
Failure to comply with the requirements of this AD may result in significant consequences. While specific penalties are not outlined in the AD, non-compliance could lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions may include fines, suspension or revocation of aircraft operating certificates, or other regulatory penalties. The severity of these consequences highlights the critical nature of adhering to the safety directives issued by CASA to maintain the highest standards of air safety.