AD/RAD/74 - Garmin GNS 430

Administered by Department of Infrastructure, Transport, Regional Development, Communications, Sport and the Arts

Legislation au F2006B06529 In force Legislative Instrument

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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.

 

Radio Communication and Navigation Equipment

 

AD/RAD/74 Garmin GNS 430 2/2002

 

Applicability: Garmin International GNS 430 Comm/Nav/GPS unit Part Number 011-00280-00 with the following Serial Numbers:

 

96300001, 96300002, 96300017, 96300028, 96300034, 96300040, 96300068,

96300104, 96300108, 96300122, 96300125, 96300130, 96300142, 96300149,

96300161, 96300165, 96300218, 96300222, 96300232, 96300269, 96300272,

96300308, 96300333, 96300340, 96300348, 96300354, 96300369, 96300372,

96300382, 96300394, 96300411, 96300413, 96300429, 96300437, 96300451,

96300484, 96300485, 96300489, 96300504, 96300506, 96300513, 96300522,

96300549, 96300563, 96300585, 96300587, 96300618, 96300621, 96300624,

96300628, 96300641, 96300653, 96300664, 96300713, 96300734, 96300756,

96300766, 96300781, 96300785, 96300786, 96300808, 96300831, 96300837,

96300842, 96300846, 96300866, 96300870, 96300872, 96300899, 96300916,

96300923, 96300925, 96300929, 96300941, 96300961, 96300984, 96300987,

96301021, 96301108, 96301130, 96301280, and 96301296 through 96303200

 

Note 1: These GNS 430 units are known to be installed in, but not limited to, the following aeroplanes:

 

Manufacturer Model

 

Cessna Aircraft Company 172, 182, 206, 208, 210, 401, 402, 404, 406,

411, 414, 414A, 421A, 421B, 421C, 425, 441,

500, 550, S550, 552, 560, 560XL, 501, 525, and

551.

 

Mooney Aircraft M20, M20A, M20B, M20C, M20D, M20E,

M20F, M20G, M20J, M20K, M20L, M20M, M20R, M20S, and M22.

 

Raytheon Aircraft Company Beech Models E33, F33, G33, E33A, F33A,

E33C, F33C, 35, 35R, A35, B35, B35TC, C35, D35, E35, F35, G35, H35, J35, K35, M35, N35, P35, S35, V35, V35TC, V35A, V35A-TC, V35B, V35B-TC, 36, A36, A36TC, 50, B50, C50, D50, D50A, D50B, D50C, D50E, E50, F50, G50, H50, J50, 60, A60, B60, 65-90, 65-A90, B90, C90, C90A, C90B, E90, F90, 100, A100, B100, 95-55, 95-A55, 95-B55, 95-C55, D-55, E55, 58,

58P, and 58TC.

 

Socata TBM 700

 

The New Piper Aircraft Inc J3C-40, J3C-50, J3C-50S (Army L-4, L-4B, L-

4H, and L-4J), J3C-65 (Navy NE-1 and NE-2), J3C-65S, J3F-50, J3F-50S, J3F-60, J3F-60S, J3F-65 (Army L-4D), J3F-65S, J3L, J3L-S, J3L-65 (Army L-4C), J3L-65S, J4, J4A, J4A-S, J4E (Army L-4E), J5A (Army L-4F), J5A-80, J5B (Army L-4G), J5C, AE-1, HE-1, PA-11,

PA-11S, PA-12, PA-12S, PA-14, PA-15, PA-16, PA-16S, PA-17, PA-18, PA-18A, PA-18A

(Restricted), PA-18S, PA-18-"105'' (Special),

PA-18S-"105'' (Special), PA-18-"125'' (Army L-

21A), PA-18AS-"125'', PA-18S-"125'', PA-18-

"135'' (Army L-21B), PA-18A-"135'', PA-18A-

"135'' (Restricted), PA-18AS-"135'', PA-18S-

"135'', PA-18-"150'', PA-18A-"150'', PA-18A-

"150'' (Restricted), PA-18AS-"150'', PA-18S-

"150'', PA-19 (Army L-18C), PA-19S, PA- 20,

P-20S, PA-20-"115'', PA-20S-"115'', PA-20-

"135'', PA-20S-"135'', PA-22, PA-22-108, PA- 22-135, PA-22S-135, PA-22-150, PA-22S-150, PA-22-160, PA-22S-160, PA-24, PA-24-250, PA-24-260, PA-24-400, PA-25, PA-25-235, PA- 25-260, PA-28-140, PA-28-150, PA-28-151,

PA-28-160, PA-28-161, PA-28-180, PA-28-235, PA-28S-160, PA-28R-180, PA-28S-180, PA-28- 181, PA-28R-200, PA-28R-201, PA-28R-201T, PA-28RT-201, PA-28RT-201T, PA-28-201T, PA28-236, PA-32R-301 (SP), PA-32R-301 (HP), PA-32R-301T, PA-32-301, PA-32-301T, PA-36-285, PA-36-300, PA-36-375, PA-38-112, PA-46-310P and PA-46-350P.

Requirement: 1. Modify the deviation and flag output circuitry in accordance with the Modification Instructions section of Garmin Service Bulletin No 9905, Revision A, dated 17 September 1999.

 

2. GNS 430 units, with the serial numbers listed in the Applicability Statement, may not be installed on any aeroplane unless modified in accordance with Requirement 1.

 

Note 2: FAA AD 2001-23-17 Amdt 39-12516 refers.

 

Compliance: For Requirement 1 - Within six months after the effective date of this Directive.

 

For Requirement 2 - As of the effective date of this Directive.

 

This Airworthiness Directive becomes effective on 21 February 2002.

 

Background: The United States Federal Aviation Administration has received reports of inaccurate course deviations caused by external electrical noise to the GNS 430 unit's course deviation indicator (CDI). Such displays could result in the pilot making decisions that put the aircraft in unsafe flight conditions. This Directive requires the modification of the unit to incorporate circuitry changes to the GNS 430 unit's deviation and flag outputs to prevent external noise from causing inaccurate course deviation displays in the GNS 430 unit's CDI or horizontal situation indicator (HSI).


 

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 14 January 2002

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


The above AD is notified in the Commonwealth of Australia Gazette on 30 January 2002.

Overview

The Civil Aviation Safety Authority (CASA) issued Airworthiness Directive (AD)/RAD/74 Garmin GNS 430 2/2002 on 21 February 2002 to address safety concerns regarding Garmin International GNS 430 Comm/Nav/GPS units with specific serial numbers. The directive was issued under subregulation 39.1(1) of the Civil Aviation Regulations 1998 (CAR 1998). The problem the AD was introduced to address was inaccurate course deviations caused by external electrical noise to the unit's course deviation indicator (CDI), which could result in unsafe flight conditions. The policy objective of this AD is to correct the unsafe condition by requiring modifications to the deviation and flag output circuitry in accordance with Garmin Service Bulletin No 9905, Revision A, dated 17 September 1999. The AD applies to Garmin International GNS 430 Comm/Nav/GPS units with the specified serial numbers and mandates modifications within six months of the effective date. It also prohibits the installation of unmodified units on any aeroplane. The AD became effective on 21 February 2002, and compliance is mandatory. The AD references FAA AD 2001-23-17 Amdt 39-12516.

Scope and Application

The Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) applies specifically to Garmin International GNS 430 Comm/Nav/GPS units with specified serial numbers installed in certain aircraft models. This directive mandates modifications to the deviation and flag output circuitry of these units to prevent inaccurate course deviations caused by external electrical noise. The directive applies to specific serial numbers of the GNS 430 units and explicitly states that these units must be modified in compliance with Garmin Service Bulletin No 9905, Revision A, before they can be installed in any aircraft. Compliance with these modifications must be achieved within six months from the effective date of the directive, which is 21 February 2002. The directive extends to the national level within Australia and is based on findings by the United States Federal Aviation Administration regarding the safety risks posed by these units. This directive ensures that affected aircraft maintain airworthiness standards by mitigating the risk of unsafe flight conditions due to inaccurate navigational information.

Key Provisions

The Airworthiness Directive AD/RAD/74, issued by the Civil Aviation Safety Authority (CASA) delegate, pertains specifically to Garmin International GNS 430 Comm/Nav/GPS units with certain serial numbers. These units are required to undergo modifications to their deviation and flag output circuitry to prevent inaccurate course deviations caused by external electrical noise, which could lead to unsafe flight conditions. The directive applies to GNS 430 units with serial numbers ranging from 96300001 to 96303200 and specifies that these units must be modified in accordance with Garmin Service Bulletin No 9905, Revision A, dated 17 September 1999. Additionally, these units cannot be installed on any aircraft unless they have been modified as per the directive's requirements. Entities governed by this Airworthiness Directive must ensure that the specified modifications are carried out within six months of the directive's effective date. For Requirement 1, this means modifying the deviation and flag output circuitry as outlined in the Garmin Service Bulletin. For Requirement 2, it means that any aircraft installation of the specified GNS 430 units must be in compliance with the modifications by the directive's effective date, 21 February 2002. The directive further clarifies that once the modifications are completed, the units cannot be installed in aircraft without adhering to the specified requirements. Failure to comply with the Airworthiness Directive could result in serious safety risks, as the inaccurate course deviation displays could lead to unsafe flight conditions. The directive does not explicitly state penalties for non-compliance, but non-compliance with CASA directives generally can result in enforcement actions, including fines, suspension or revocation of airworthiness certificates, and potential criminal charges if the non-compliance leads to accidents or endangers safety. The potential penalties underscore the importance of adhering to the directive to maintain the highest safety standards in aviation.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.