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AD/FSM/29 Amdt 4 - Precision Airmotive Corporation Carburettors
Fuel Supply and Metering EquipmentFuel Supply and Metering Equipment
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Fuel Supply and Metering Equipment
| AD/FSM/29 Amdt 4 | Precision Airmotive Corporation Carburettors | 10/2005 |
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| Applicability: | Precision Airmotive Corporation (PAC, formerly Facet Aerospace Products Corporation and Marvel-Schebler Corporation) Model MA-3, MA-3A, MA-3PA, MA-3SPA, MA-4SPA carburettors installed on but not limited to Textron Lycoming O-235, O-290, and O-320 series engines, and Teledyne Continental Motors (TCM) A-65, A-75, C-75, C-85, C-90, C-115, C-125, C-145, O-200, and O-300 series engines. |
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| Requirement: | Model MA-3A, MA-3PA, MA-3SPA, and MA4-SPA carburettors:1. Inspect the carburettor to determine if a two-piece venturi is installed. If a two-piece venturi is installed, inspect the carburettor to determine if the primary venturi is loose or missing.2. If a two-piece venturi is installed and the primary venturi is found loose or missing, repair the carburettor by installing a serviceable two-piece venturi or by installing a one-piece venturi as per provisions of Precision Airmotive Service Bulletin (SB) No. MSA-2, Revision 1, 2, 3 or later FAA approved revision.Note 1: Carburettors that have the letter "V" stamped or etched on the lower portion of the data plate, or that have a black, yellow, or blue data plate showing the Precision Airmotive Corporation (PAC) name and logo, or that have a black Facet Aerospace Products data plate with a serial number beginning with 750, are already equipped with a one-piece venturi and no further action is necessary provided the engine does not subsequently run rough or experience power loss.3. IF the carburettor is fitted with a one-piece venturi AND the engine runs rough or experiences power loss AND providing the rough running engine or power loss can be traced to the carburettor venturi or fuel nozzle THEN accomplish either of the following:3A Install a carburettor containing a two-piece venturi and resume the inspections as per requirement 1 and 2 of this AD; OR |
| 3B Modify the carburettor in accordance with paragraphs 3B-(a), 3B-(b), or 3B-(c) of this Directive, as applicable:(a) For PAC Model MA-3SPA series carburettors with part numbers (P/N) 10-4894 or 10-4115-1, installed on TCM Model O-200A series engines modified by installing a one-piece venturi, install a new fuel nozzle in accordance with PAC SB MSA-7, dated 30 September 1994.(b) For PAC Model MA-3SPA series carburettors with P/Ns 10-4895, 10-4439, or 10-3237, installed on TCM Model O-300 or C-145 series engines modified by installing a one-piece venturi, install a new fuel nozzle in accordance with PAC SB No. MSA-8, dated 10 July 1995.(c) For PAC Model MA-3SPA series carburettors with P/Ns 10-4240, 10-4252, 10-4252-1, or 10-4457, installed on TCM Model C-75, C-85, or C-90 series engines modified by installing a one-piece venturi, install a new fuel nozzle in accordance with PAC SB No. MSA-9, dated 10 October 1995.Note 2: Model MA-3A, MA-3PA, and MA4-SPA carburettors already utilize the type of nozzles referred to, in the modification requirement 3B hence no further mandatory modifications are available at present.Note 3: Installing a one-piece venturi constitutes terminating action for the repetitive inspection as per requirement 1 of this AD.Model MA-3 series carburettors:4. Inspect the carburettor to determine if the primary venturi is loose or missing.5. If the primary venturi is found loose or missing, repair the carburettor by installing a serviceable two-piece venturi, or replace the entire carburettor with a serviceable carburettor.Note 4: FAA AD 98-01-06 Amendment 39-10270 refers. |
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