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A mounting system for locating a combustor and a fuel manifold of a gas turbine engine within a gas generator casing thereof is described. The mounting system comprises at least three support pin assemblies which extend radially inwardly from the gas generator casing. The support pin assemblies supp

A mounting system for locating a combustor and a fuel manifold of a gas turbine engine within a gas generator casing thereof is described. The mounting system comprises at least three support pin assemblies which extend radially inwardly from the gas generator casing. The support pin assemblies support both the fuel manifold and at least an upstream end of the combustor and maintaining engagement between the fuel manifold and the combustor during operation of the gas turbine engine.

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1. A combustor assembly for a gas turbine engine comprising an annular internal fuel manifold mounted to a combustor within the gas turbine engine by a common mounting system, the fuel manifold having at least one fuel conveying passage therein in fluid flow communication with a plurality of fuel in

1. A combustor assembly for a gas turbine engine comprising an annular internal fuel manifold mounted to a combustor within the gas turbine engine by a common mounting system, the fuel manifold having at least one fuel conveying passage therein in fluid flow communication with a plurality of fuel injection nozzles disposed about the fuel manifold and adapted to spray fuel into the combustor, the mounting system supporting both the fuel manifold and the combustor within a surrounding gas generator casing such that the combustor is rigidly supported within the gas generator casing in an axial direction, the mounting system having a first support tube connecting the gas generator case to a combustor liner and permitting relative radial displacement between the fuel manifold and the combustor and the gas generator case such as to absorb any radial thermal growth differential therebetween. 2. The combustor assembly as defined in claim 1, wherein the mounting system includes at least three pin support assemblies equally spaced apart about the annular fuel manifold. 3. The combustor assembly as defined in claim 2, wherein each of said pin support assemblies includes: a combustor mounting flange fastened to an upstream end of the combustor liner, said upstream end of the combustor liner at least partially enclosing the fuel manifold;the first support tube extending radially inward from the gas generator casing and having an outer end fastened thereto, an inner end of the first support tube being mounted to the combustor mounting flange; anda second support tube disposed within the first support tube and being spaced inwardly therefrom, an outer end of the second support tube being fastened to the gas generator casing and an inner end of the second support tube locating a fuel inlet tube therewithin, the fuel inlet tube being spaced inwardly from the second support tube along a portion of a length thereof, an inner end of the fuel inlet tube being engaged with the fuel manifold and having a fuel inlet passage therein providing fuel flow communication with said at least one fuel conveying passage of the fuel manifold. 4. The combustor assembly as defined in claim 3, wherein the inner end of the first support tube is mounted to the combustor mounting flange by an angularly compliant joint. 5. The combustor assembly as defined in claim 4, wherein the angularly compliant joint includes a tubular bearing element disposed between the inner end of the first support tube and an opposed portion of the combustor mounting flange, the tubular bearing element having opposed convex side walls abutted each of said inner end of the first support tube and said opposed portion of the combustor mounting flange, such that relative angular displacement therebetween is permitted. 6. The combustor assembly as defined in claim 3, wherein the fuel inlet tube and the inner end of the second support tube are matingly engaged with each other such that sliding displacement therebetween is possible in a radial direction. 7. The combustor assembly as defined in claim 3, wherein the first support tube, the second support tube and the fuel inlet tube are concentrically disposed within one another. 8. The combustor assembly as defined in claim 3, wherein an annular air gap is defined between the first support tube and the second support tube. 9. The combustor assembly as defined in claim 8, wherein an annular air passage is defined between the second support tube and the fuel inlet tube along said portion of the length of the second support tube, said annular air passage receiving cooling airflow therein. 10. A mounting system for locating a combustor and a fuel manifold of a gas turbine engine within a gas generator casing thereof, the mounting system comprising at least three support pin assemblies which extend radially inwardly from the gas generator casing, the support pin assemblies supporting both the fuel manifold and at least an upstream end of the combustor and maintaining engagement between the fuel manifold and the combustor during operation of the gas turbine engine, wherein each of said pin support assemblies includes: a combustor mounting flange fastened to an upstream end of the combustor, said upstream end of the combustor at least partially enclosing the fuel manifold; and a first support tube extending radially inward from the gas generator casing and having an outer end fastened thereto, an inner end of the first support tube being mounted to the combustor mounting flange. 11. The mounting system as defined in claim 10, wherein the support pin assemblies include means for absorbing a thermal growth differential therebetween in at least a radial direction. 12. The mounting system as defined in claim 11, wherein said means for absorbing thermal growth differential provides axial constraint while permitting radial thermal expansion between the fuel manifold and the combustor. 13. The mounting system as defined in claim 10, wherein each of said pin support assemblies further includes: a second support tube disposed within the first support tube and being spaced inwardly therefrom, an outer end of the second support tube being fastened to the gas generator casing and an inner end of the second support tube locating a fuel inlet tube therewithin, the fuel inlet tube being spaced inwardly from the second support tube along a portion of a length thereof, an inner end of the fuel inlet tube being engaged with the fuel manifold and having a fuel inlet passage therein providing fuel flow communication with said at least one fuel conveying passage of the fuel manifold. 14. The mounting system as defined in claim 13, wherein the inner end of the first support tube is mounted to the combustor mounting flange by an angularly compliant joint. 15. The mounting system as defined in claim 14, wherein the angularly compliant joint includes a tubular bearing element disposed between the inner end of the first support tube and an opposed portion of the combustor mounting flange, the tubular bearing element having opposed convex side walls abutted each of said inner end of the first support tube and said opposed portion of the combustor mounting flange, such that relative angular displacement therebetween is permitted. 16. The mounting system as defined in claim 13, wherein the fuel inlet tube and the inner end of the second support tube are matingly engaged with each other such that sliding displacement therebetween is possible in a radial direction. 17. The mounting system as defined in claim 13, wherein the first support tube, the second support tube and the fuel inlet tube are concentrically disposed within one another. 18. The mounting system as defined in claim 13, wherein an annular air gap is defined between the first support tube and the second support tube. 19. The mounting system as defined in claim 13, wherein an annular air passage is defined between the second support tube and the fuel inlet tube along said portion of the length of the second support tube, said annular air passage receiving cooling airflow therein. 20. The mounting system as defined in claim 1, wherein the mounting system includes at least three pin support assemblies equally spaced apart about the annular fuel manifold.