AD/CESSNA 337/30 Pitot Tube Installation
CESSNA 337G · Supplemental Type Certificate
Overview
This document is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) of Australia concerning the Cessna 337 series aircraft. The directive addresses the installation of an extended pitot tube as per the requirements of Supplemental Type Certificate (STC) SA1627WE. It applies to specific serial numbers of the Cessna 337 series that have been modified under this STC. The directive outlines the necessary actions to ensure the safety and reliability of the aircraft's airspeed indications, particularly in preventing issues related to ice formation in the pitot system. Compliance with the directive is mandated within a specified time frame to maintain airworthiness.
- The directive applies to Cessna 337 series aircraft modified under STC SA1627WE.
- Affected serial numbers range from 337-0058 to 337-1307.
- Installation of Robertson Kit No. 14-118-100 is required for the extended pitot tube.
- Compliance must be achieved within 100 hours of service after June 5, 2008.
- The directive addresses potential issues with airspeed indications due to ice formation.
Document
Source
Originally published by services.casa.gov.au. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Supplemental Type Certificate
- Year
- 2008
- Pages
- 2
- File size
- 22 KB
- Publisher
- services.casa.gov.au
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In this document
Applicability
The AD applies to Cessna 337 series aircraft that have been modified according to FAA STC SA1627WE. A list of specific serial numbers affected by this directive is provided, covering a range of aircraft from 337-0058 to 337-1307.
Requirement
The directive requires the rework of the extended pitot tube by installing Robertson Kit No. 14-118-100. This installation must be performed in accordance with the modification instructions dated January 23, 1975.
Compliance
Aircraft owners must complete the required actions within 100 hours of time in service after the effective date of the directive, which is June 5, 2008.
Background
The directive was issued following a review that indicated a previous FAA AD (75-09-05) had not been addressed in Australia. The FAA AD was intended to prevent unreliable airspeed indications due to ice in the pitot system. Although there have been no reported incidents in Australia, CASA is obligated to publish directives that may affect Australian-registered aircraft.
Safety notes
- Failure to comply with the directive may result in unreliable airspeed indications.
Full document text
COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Page 1 of 2 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. Cessna 337 Series Aeroplanes AD/CESSNA 337/30 Pitot Tube Installation 6/2008 Applicability: Model 337 series aircraft modified in accordance with United States Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) SA1627WE with the following serial numbers: 337-0058 337-0063 337-0124 337-0205 337-0220 337-0291 337-0305 337-0327 337-0332 337-0443 337-0502 337-0540 337-0549 337-0566 337-0577 337-0685 337-0695 337-0726 337-0728 337-0732 337-0741 337-0817 337-0822 337-0836 337-0880, 337-0882, 337-0896 337-0916 337-0925 337-0929 337-0938 337-0942 337-0946 337-0947 337-0959 337-0963 337-0970 337-0977 337-0992 337-0996 337-1019 337-1036 337-1044 337-1052 337-1062 337-1072 337-1073 337-1079 337-1082 337-1091 337-1108 337-1118 337-1124 337-1139 337-1154 337-1159 337-1162 337-1175 337-1177 337-1180 337-1192 337-1210 337-1232 337-1258 337-1262 337-1274 337-1276 337-1303 337-1307 Note 1: STC SA1627WE which was originally held Robertson Aircraft Corporation, 839 West Perimeter Rd, Renton, WA, the STC is now held by Sierra Industries Ltd, 122 Howard Langford Dr, Uvalde, TX. Requirement: If not previously accomplished, rework the extended pitot tube by installation of Robertson Kit No. 14-118-100 in accordance with Robertson modification instructions No 14-118-10 dated 23 January 1975. Note 2: The requirements of this Directive may have been accomplished prior to the aircraft’s arrival in Australia and the aircraft’s maintenance records may indicate compliance with FAA AD 75-09-05, this is considered acceptable for compliance with this Directive. Note 3: FAA AD 75-09-05 Amdt 39-2177 refers. Compliance: Within 100 hours time in service after the effective date of this Directive. This Airworthiness Directive becomes effective on 5 June 2008. COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 337 Series Aeroplanes AD/CESSNA 337/30 (continued) Page 2 of 2 Background: This Directive follows an internal review of Australian Airworthiness Directives (AD) which indicated an Australian AD was not issued in response to FAA AD 75-09-05, as there were no aircraft in the affected serial number range in Australia at that time. The FAA AD was originally to prevent the possibility of unreliable airspeed indications due to ice formation in the pitot system. Whilst CASA acknowledges that there have been no incidents of a similar nature reported in Australia and that only one of the affected aeroplanes is currently on the Australian register, CASA is required to publish State of design ADs which may affect Australian aircraft. James Coyne Delegate of the Civil Aviation Safety Authority 21 April 2008
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