1. A gas turbine engine hybrid outer guide vane heat exchanger apparatus
comprising:
a circular row of fan outlet guide vanes,
one or more hybrid groups of networked guide vane heat exchangers including at least some of the fan outlet guide vanes,
the networked guide vane heat exchangers including heat exchangers within the at least some of the fan outlet guide vanes, and
the guide vane heat exchangers being networked and fluidly interconnected both in series and in parallel.
2. The apparatus as claimed in claim 1, further comprising each one of the hybrid groups of networked guide vane heat exchangers including three or more of the guide vane heat exchangers fluidly connected both in series and in parallel.
3. The apparatus as claimed in claim 1, further comprising:
two or more serial sets of the networked guide vane heat exchangers in each one of the hybrid groups,
each of the serial sets including two or more of the guide vane heat exchangers connected in series, and
the two or more serial sets connected in parallel.
4. The apparatus as claimed in claim 1, further comprising:
two or more serial sets of the networked guide vane heat exchangers in each one of the hybrid groups,
each of the serial sets including two or more of the guide vane heat exchangers connected in series,
one or more parallel sets of the networked guide vane heat exchangers in the hybrid group, and
each of the one or more parallel sets including two or more of the guide

vane heat exchangers and at least one of the serial sets connected in parallel.
5. The apparatus as claimed in claim 1, further comprising each of the heat exchangers including an oil circuit extending from an oil inlet manifold to an oil outlet manifold and operative for directing oil through the heat exchanger.
6. The apparatus as claimed in claim 1, further comprising:
an oil supply line including or connected to an annular oil supply manifold,
the annular oil supply manifold connected in oil supply flow relationship to the hybrid group of the networked guide vane heat exchangers,
an oil return line including or connected to an annular oil return manifold, and
the annular oil return manifold connected in oil return flow relationship to the hybrid group of the networked guide vane heat exchangers.
7. The apparatus as claimed in claim 6, further comprising:
two or more serial sets of the networked guide vane heat exchangers in the hybrid group,
each of the serial sets including two or more of the guide vane heat exchangers connected in series,
one or more parallel sets of the networked guide vane heat exchangers in the hybrid group, and
each of the one or more parallel sets including two or more of the guide vane heat exchangers connected in parallel.
8. The apparatus as claimed in claim 7, further comprising:
a first one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil supply manifold,
a last one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil return manifold, and
all of the guide vane heat exchangers in the one or more parallel sets

directly fluidly connected to the annular oil supply manifold and the oil return line.
9. The apparatus as claimed in claim 6, further comprising:
a first one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil supply manifold, and
a last one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil return manifold.
10. A gas turbine engine comprising:
a hybrid outer guide vane heat exchanger apparatus including a circular row of fan outlet guide vanes extending across a fan flowpath between an annular fan casing and a hub located radially inwardly of the fan casing,
one or more hybrid groups of networked guide vane heat exchangers including at least some of the fan outlet guide vanes, and
the guide vane heat exchangers being networked and fluidly interconnected both in series and in parallel.
11. The engine as claimed in claim 10, further comprising:
an oil supply line including or connected to an annular oil supply manifold,
the annular oil supply manifold connected in oil supply flow relationship to the hybrid group of the networked guide vane heat exchangers,
an oil return line including or connected to an annular oil return manifold, and
the annular oil return manifold connected in oil return flow relationship to the hybrid group of the networked guide vane heat exchangers.
12. The engine as claimed in claim 10, further comprising the hybrid group of
networked guide vane heat exchangers including three or more of the guide vane
heat exchangers fluidly connected both in series and in parallel.

13. The engine as claimed in claim 10, further comprising:
two or more serial sets of the networked guide vane heat exchangers in the hybrid group,
each of the serial sets including two or more of the guide vane heat exchangers connected in series, and
the two or more serial sets connected in parallel.
14. The engine as claimed in claim 10, further comprising:
two or more serial sets of the networked guide vane heat exchangers in the hybrid group,
each of the serial sets including two or more of the guide vane heat exchangers connected in series,
one or more parallel sets of the networked guide vane heat exchangers in the hybrid group, and
each of the one or more parallel sets including two or more of the guide vane heat exchangers and at least one of the serial sets connected in parallel.
15. The engine as claimed in claim 10, further comprising each of the heat exchangers including an oil circuit extending from an oil inlet manifold to an oil outlet manifold and operative for directing oil through the heat exchanger.
16. The engine as claimed in claim 11, further comprising:
two or more serial sets of the networked guide vane heat exchangers in the hybrid group,
each of the serial sets including two or more of the guide vane heat exchangers connected in series,
one or more parallel sets of the networked guide vane heat exchangers in the hybrid group, and
each of the one or more parallel sets including two or more of the guide vane heat exchangers connected in parallel.

17. The engine as claimed in claim 16, further comprising:
a first one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil supply manifold,
a last one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil return manifold, and
all of the guide vane heat exchangers in the one or more parallel sets directly fluidly connected to the annular oil supply manifold and the oil return line.
18. The engine as claimed in claim 11, further comprising:
a first one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil supply manifold, and
a last one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil return manifold.
19. The engine as claimed in claim 11, further comprising:
a first one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil supply manifold, and
a last one of the guide vane heat exchangers in each of the serial sets directly fluidly connected to the annular oil return manifold.
20. The engine as claimed in claim 11, further comprising the OGV heat exchangers fluidly connected for cooling oil for the engine's lubrication system including bearings and/or for an integrated drive generator oil system.
21. The engine as claimed in claim 10, further comprising:
first and second groups of the one or more hybrid groups of networked guide vane heat exchangers,
the first group operably connected to a lubrication system of the engine for provide cooling for the lubrication system, and
the second group operably connected to a variable frequency generator

and/or an integrated drive generator for provide cooling for the variable frequency generator and/or integrated drive generator.
22. The engine as claimed in claim 21, further comprising each of the first and second groups of networked guide vane heat exchangers including three or more of the guide vane heat exchangers fluidly connected both in series and in parallel.
23. The engine as claimed in claim 21, further comprising:
two or more serial sets of the networked guide vane heat exchangers in each of the first and second groups,
each of the serial sets including two or more of the guide vane heat exchangers connected in series, and
the two or more serial sets connected in parallel.