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A single bolting flange arrangement for variable inlet guide vane (VIGV) connection includes a connection arm connected to a stem of the VIGV to rotate the VIGV. The connection arm is driven by a drive pin received in a slot of the connection arm. The connection arm has a bolting flange and the stem

A single bolting flange arrangement for variable inlet guide vane (VIGV) connection includes a connection arm connected to a stem of the VIGV to rotate the VIGV. The connection arm is driven by a drive pin received in a slot of the connection arm. The connection arm has a bolting flange and the stem of the VIGV is fastened to one side of the single bolting flange by a bolt/nut assembly.

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1. A variable guide vane (VGV) apparatus comprising: a plurality of variable guide vanes (VGVs), each vane having a rotational axis and being rotatable in an adjustable angular orientation about the rotational axis of the vane;a unison ring defining a central axis and including a plurality of drive

1. A variable guide vane (VGV) apparatus comprising: a plurality of variable guide vanes (VGVs), each vane having a rotational axis and being rotatable in an adjustable angular orientation about the rotational axis of the vane;a unison ring defining a central axis and including a plurality of drive pins affixed to the unison ring, the drive pins with the unison ring being adjustable in an angular orientation about the central axis;a plurality of arms each including a base, a pair of parallel forks extending away from the base in a first direction and a bolting flange extending away from the base in a second direction opposite to the first direction, the pair of forks defining a slot therebetween, one of said drive pins being slidably received in the slot, the bolting flange defining a hole extending therethrough;a plurality of stems connected to the respective VGVs and rotatable about the rotational axis of the respective vanes, each stem having an end section defining parallel side surfaces facing away from each other, each stem defining a hole extending from one side surface to the other side surface; anda plurality of bolts moveably securing the stems to the respective arms, each bolt extending in a tangential direction with respect to the central axis through the hole of one of the bolting flanges and through the hole of one of the stems, wherein one of the side surface of each stem is in contact with the bolting flange of a corresponding arm while the other side surface of each stem is free of contact with said corresponding arm. 2. The apparatus as defined in claim 1 further comprising a plurality of nuts securing the bolts to the arms and the stems, respectively. 3. The apparatus as defined in claim 1 wherein the drive pins and the stems extend axially with respect to the central axis. 4. The apparatus as defined in claim 3 wherein the rotational axis of the respective vanes is parallel to the central axis of the unison ring. 5. The apparatus as defined in claim 3 wherein the end section of the respective stems comprises a radially-outer surface and a radially-inner surface with respect to the central axis, the radially-outer and radially-inner surfaces being at least partially in contact with the respective arms. 6. The apparatus as defined in claim 5 wherein the radially-outer and radially-inner surfaces of the end section of the respective stems comprise a curved profile. 7. The apparatus as defined in claim 1 wherein each of the arms further comprises a support member affixed to the bolting flange and spaced apart from the base, the support member and the base in combination retaining the end section of a corresponding stem therebetween during a stem assembly procedure. 8. The apparatus as defined in claim 7 wherein the base and support member of each of the arms comprise curved surfaces facing each other, respective said curved surfaces being at least partially in contact with the end section of a corresponding stem. 9. The apparatus as defined in claim 7 wherein each of the arms including at least the forks, base, bolting flange and support member is an integral single-piece component. 10. The apparatus as defined in claim 1 wherein each of the arms further comprises a back flange extending away from the base in the second direction and being disposed substantially normal to the bolting flange. 11. The apparatus as defined in claim 10 wherein the back flange and bolting flange of each of the arms are joined one with another. 12. A gas turbine engine comprising: a compressor section;a combustion section;a turbine section; anda variable guide vane (VGV) apparatus mounted to the compressor section and having a plurality of variable guide vanes (VGVs), each vane having a rotational axis and being rotatable about the rotational axis, the apparatus further including:a unison ring disposed around an engine central axis and including a plurality of drive pins affixed to a side of the unison ring and extending axially with respect to the central axis, the unison ring being adjustable in a circumferential direction with respect to the central axis;a plurality of arms each including a base, a pair of parallel forks extending radially outwardly from the base and a bolting flange extending radially and inwardly with respect to the central axis, the forks defining a slot therebetween, one of said axial drive pins being slidably received in the slot, the bolting flange defining a hole extending therethrough;a plurality of stems connected to the respective VGVs and supported in the engine to be rotatable about the respective rotational axes of the VGVs, each stem having an end section defining parallel side surfaces facing away one from the other, and each stem defining a hole extending from one side surface to the other side surface; anda plurality of bolts moveably securing the stems to the respective arms, each bolt extending in a tangential direction with respect to the central axis through the hole of one of the bolting flanges and through the hole of one of the stems, wherein one of the side surface of each stem is in contact with the bolting flange of a corresponding arm while the other side surface of each stem is free of contact with said corresponding arm. 13. The gas turbine engine as defined in claim 12 wherein the rotational axis of each vane is parallel to the central axis. 14. The gas turbine engine as defined in claim 12 wherein each of the stems comprises a cylindrical section rotatably supported within the engine to define the rotational axis one of the VGVs. 15. The gas turbine engine as defined in claim 12 wherein the VGVs are disposed within a radial inlet of an airflow duct in the compressor section for directing an airflow radially into the compressor section. 16. A variable guide vane (VGV) apparatus comprising: a plurality of variable guide vanes (VGVs), each vane having a rotational axis and being rotatable in an adjustable angular orientation about the rotational axis of the vane;a unison ring defining a central axis and including a plurality of drive pins affixed to the unison ring, the drive pins with the unison ring being adjustable in an angular orientation about the central axis, the drive pins extending axially with respect to the central axis;a plurality of arms each including a base, a pair of parallel forks extending away from the base in a first direction and a bolting flange extending away from the base in a second direction opposite to the first direction, the pair of forks defining a slot therebetween, one of said drive pins being slidably received in the slot, the bolting flange defining a hole extending therethrough;a plurality of stems connected to the respective VGVs and rotatable about the rotational axis of the respective vanes, each stem having an end section defining parallel side surfaces facing away from each other, each stem defining a hole extending from one side surface to the other side surface, the stems extending axially with respect to the central axis; anda plurality of bolts moveably securing the stems to the respective arms, each bolt extending in a tangential direction with respect to the central axis through the hole of one of the bolting flanges and through the hole of one of the stems, wherein one of the side surface of each stem is in contact with the bolting flange of a corresponding arm while the other side surface of each stem is free of contact with said corresponding arm;wherein the end section of the respective stems comprises a radially-outer surface and a radially-inner surface with respect to the central axis, the radially-outer and radially-inner surfaces being at least partially in contact with the respective arms, the radially-outer and radially-inner surfaces comprising a curved profile.