Removing material buildup from an internal surface within a gas turbine engine system

1. A method involving a gas turbine engine system, comprising:

configuring a plug within a fluid passage in the gas turbine engine system using a catheter, the plug between first and second portions of the fluid passage;

inserting a nozzle into the first portion of the fluid passage;

moving the nozzle within the first portion of the fluid passage towards the plug, wherein the nozzle moves within the fluid passage next to the catheter;

removing material from an interior surface of the fluid passage in the first portion of the fluid passage to provide removed material, wherein the plug substantially prevents the removed material from entering the second portion of the fluid passage, the material is removed from the interior surface using at least a stream of pressurized fluid, and the stream of pressurized fluid is directed out of the nozzle towards the interior surface to remove at least some of the material from the interior surface;

directing the removed material out of the fluid passage; and

removing the plug from the fluid passage.

2. The method of claim 1 , wherein the plug is removed from the fluid passage after substantially all of the removed material is directed out of the fluid passage, and the removed material is directed out of the fluid passage using suction.

3. The method of claim 1 , wherein the configuring of the plug comprises inserting the plug into the fluid passage and then configuring the plug to substantially plug the fluid passage.

4. The method of claim 1 , wherein the plug comprises an expandable bladder.

5. The method of claim 1 , wherein the plug comprises a shield facing the first portion of the fluid passage.

6. The method of claim 1 , wherein the stream of pressurized fluid is a first stream of pressurized fluid, the material is further removed from the interior surface using at least a second stream of pressurized fluid, and the second stream of pressurized fluid is directed out of the nozzle towards the interior surface to remove some of the material from the interior surface.

7. The method of claim 1 , wherein the stream of pressurized fluid is directed out of the nozzle such that at least the stream of pressurized fluid propels the nozzle within the first portion of the fluid passage towards the plug.

8. The method of claim 1 , wherein the nozzle is configured with and moves along the catheter.

9. The method of claim 1 , wherein the nozzle is discrete from the catheter.

10. The method of claim 1 , wherein the gas turbine engine system comprises a turbine stator vane, the fluid passage comprises a lubrication conduit that extends through the turbine stator vane, and the lubrication conduit comprises the first portion of the fluid passage.

11. The method of claim 1 , wherein the plug comprises an inflatable bladder.

12. The method of claim 3 , wherein

the plug is selectively configurable between a compact configuration and an expanded configuration;

the plug is inserted into the fluid passage in the compact configuration; and

the plug plugs the fluid passage in the expanded configuration.

13. The method of claim 11 , wherein configuring of the plug within the fluid passage comprises:

inserting the plug into the fluid passage while the inflatable bladder is deflated; and

inflating the inflatable bladder to cause the plug to plug the fluid passage and fluidly isolate the first portion of the fluid passage from the second portion of the fluid passage.

14. A method involving a gas turbine engine system, comprising:

configuring a plug within a fluid passage in the gas turbine engine system, the plug between first and second portions of the fluid passage

inserting a nozzle into the fluid passage;

directing a stream of pressurized fluid out of the nozzle towards an interior surface of the fluid passage to remove material from the interior surface of the fluid passage, the interior surface in the first portion of the fluid passage, wherein the plug substantially prevents the removed material from entering the second portion of the fluid passage; and

directing the removed material out of the fluid passage along a path in which the nozzle was inserted into the fluid passage;

wherein the plug comprises an inflatable bladder, and

wherein the configuring of the plug within the fluid passage comprises:

inserting the plug into the fluid passage while the inflatable bladder is deflated using a catheter; and

inflating the inflatable bladder using the catheter to cause the plug to plug the fluid passage and fluidly isolate the first portion of the fluid passage from the second portion of the fluid passage.

15. The method of claim 14 , wherein an outer diameter of the plug, when the inflatable bladder is deflated and the plug is being inserted into the fluid passage, is smaller than an inner diameter of the fluid passage with the material on the interior surface.