Ad/RAD/85 - Sandel ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator (Cth)
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 39.001(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.
Radio Communication and Navigation Equipment
| AD/RAD/85 | Sandel ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator | 11/2006 DM |
Applicability: | Sandel Avionics Incorporated (Sandel) Model ST3400 terrain awareness warning system/radio magnetic indicator (TAWS/RMI) units approved under United States Federal Aviation Administration (FAA) Technical Standard Order(s) (TSO) C113, C151a or C151b, as identified in Sandel ST3400 Service Bulletin SB3400-01, Revision B, dated 15 September 2004. | |
| Note 1: ST3400 TAWS/RMI units are known to be as installed on, but not limited, to the aeroplane models listed below. | ||
| Manufacturer | Aeroplane Model | |
| Airbus | A300 | |
Requirement: | 1. Install a placard on the TAWS/RMI which states "NOT FOR PRIMARY VOR NAVIGATION" in accordance with Sandel ST3400 SB3400-01, Revision B. |
| 2. Revise the Limitations section of the applicable Aircraft Flight Manual (AFM) to include the statement "Use of ST3400 TAWS/RMI for primary VOR navigation is prohibited unless the indicator has 3.07 or A3.06 software or later." This may be done by inserting a copy of this Directive into the AFM. | |
| 3. Field-load the TAWS/RMI with updated software having revision 3.07 (for units having serial numbers (S/ Ns) under 2000) or revision A3.06 (for units having S/Ns 2000 and subsequent) in accordance with Sandel ST3400 Service Bulletin SB3400-01, Revision B. The placard and AFM limitations revision installed as required by Requirements 1 and 2 of this Directive may be removed after the software upgrade has been accomplished. | |
| 4. ST3400 TAWS/RMI units, unless it has been modified in accordance with Sandel ST3400 Service Bulletin SB3400-01, Revision B, may not be installed on any aeroplane either as an initial installation or a replacement spare. | |
| Later revisions of the above SB, approved by the FAA as an Alternate Method of Compliance (AMOC) to FAA AD 2006-16-18, are considered acceptable for compliance with the equivalent Requirements of this Directive. | |
| Note 2: FAA AD 2006-16-18 Amdt 39-14718 refers. | |
Compliance: | For Requirements 1 and 2 - Within 14 days after the effective date of this Directive. |
| For Requirement 3 - Within 90 days after the effective date of this Directive. | |
| For Requirement 4 - As of 25 December 2006. | |
| This Airworthiness Directive becomes effective on 25 September 2006. | |
Background: | The FAA has received a report that an in-flight bearing error occurred in a Model ST3400 TAWS/RMI unit configured to receive bearing information from a very high frequency omnidirectional range (VOR) receiver interface via a composite video signal. Investigation determined that the error was due to a combination of input signal fault and software error. |
| This Directive is issued to prevent a bearing error, which could lead to an aeroplane departing from its scheduled flight path, which could in turn result in a reduction in separation from, and a possible collision with, other aircraft or terrain. |
James Coyne
Delegate of the Civil Aviation Safety Authority
31 August 2006
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