AD/Cessna 337/30 Pitot Tube Installation (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.

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.

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