AD/CESSNA 170/61 - Alternate Static Source Valve Inspection (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes

AD/CESSNA 170/61 Alternate Static Source Valve Inspection 3/98 DM

Applicability: All Cessna Model 172R Aircraft with the following serial numbers: 17280003 through 17280171 inclusive; 17280173 through 17280175 inclusive;

17280177 through 17280179 inclusive;

17280182 through 17280184 inclusive;

17280186, 17280189, 17280190, 17280192 through 17280212 inclusive;

17280214, 17280216 through 17280221 inclusive;

17280214, 17280216 through 17280221 inclusive;

17280223 through 17280236 inclusive;

17280239 through 17280251 inclusive;

17280253 through 17280263 inclusive;

17280265, 17280268, 17280270 through 17280272 inclusive; and

17280283, 17280297, and 17280301 inclusive.

Requirement: 1. Fabricate placards with the following words, using letters at least 3mm (1/8-inch) in height, and install these placards in the cockpit within the pilot's clear view:

1. 'IFR operation is prohibited.'

b. 'Use of the alternate static air source is prohibited.'

2. Inspect the alternate static air source valve to assure that the alternate static air source valve is not restricted by the identification placard and to assure that the valve body does not separate from the valve flange in accordance with Cessna Service Bulletin No. SB97-34-02, Revision 1, dated December 22, 1997.

3. If the alternate static air source valve is restricted, rework the alternate static air source assembly in accordance with Cessna Service Bulletin No. SB97-34-02, Revision 1, dated December 22, 1997.