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An assembly for a gas turbine engine comprising an accessory gearbox comprising a drive gear and a starter/generator mechanically mounted to the accessory gearbox. The starter/generator comprising a rotatable shaft, a pinion gear carried by the shaft, a main machine carried by the shaft, a permanent

An assembly for a gas turbine engine comprising an accessory gearbox comprising a drive gear and a starter/generator mechanically mounted to the accessory gearbox. The starter/generator comprising a rotatable shaft, a pinion gear carried by the shaft, a main machine carried by the shaft, a permanent magnet generator (PMG) carried by the shaft and an exciter carried by the shaft.

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1. An assembly for a gas turbine engine comprising: an accessory gearbox having a first housing with opposing sides and defining a first interior, and a drive gear located within the interior;a starter/generator comprising: a second housing defining a second interior and mechanically mounted to the

1. An assembly for a gas turbine engine comprising: an accessory gearbox having a first housing with opposing sides and defining a first interior, and a drive gear located within the interior;a starter/generator comprising: a second housing defining a second interior and mechanically mounted to the accessory gearbox, the starter/generator;a rotatable shaft having a portion located within the second interior;a pinion gear carried by the portion of the shaft;a main machine carried by the portion of the shaft;a permanent magnet generator (PMG) carried by the portion of the shaft; andan exciter carried by the portion of the shaft;wherein the starter/generator is mounted to the accessory gearbox such that the second housing is located only on one side of the first housing and the PMG and exciter are located within the second housing on the portion of the shaft between the pinion gear and the main machine, which meshes with the drive gear when the starter/generator is mounted to the accessory gearbox; andwherein at least one of the PMG and exciter is located within the accessory gearbox when the starter/generator is mounted to the accessory gearbox. 2. The assembly of claim 1 further comprising a first bearing rotatably supporting the shaft and the PMG and exciter are located on the portion of the shaft between the first bearing and the main machine. 3. The assembly of claim 2 wherein the first bearing is located on the shaft between the pinion gear and the PMG and the exciter. 4. The assembly of claim 3 further comprising a second bearing rotatably supporting the shaft. 5. The assembly of claim 4 wherein at least one of the PMG, exciter, and main machine is located on the shaft between the first and second bearings. 6. The assembly of claim 1 wherein the PMG is located on the portion of the shaft between the exciter and the pinion gear. 7. The assembly of claim 6 wherein the first bearing is located on the portion of the shaft between the PMG and the pinion gear. 8. An assembly for a gas turbine engine comprising: an accessory gearbox comprising a first housing with an access opening and a drive gear located within the first housing;a starter/generator having a second housing mechanically mounted to the first housing, comprising: a pinion gear;a main machine;a permanent magnet generator (PMG);an exciter; anda shaft having a portion rotatably mounted within the second housing and the portion supporting the pinion gear, main machine, PMG, and exciter, with the PMG and exciter supported on the portion of the shaft between the pinion gear and the main machine;wherein the first and second housings are configured to nest such that when the second housing is mounted to the first housing, a portion of the second housing extends through the access opening and into the first housing to position at least one of the PMG and exciter within the first housing, and the second housing projects from the first housing on only one side of the first housing, which meshes with the drive gear when the starter/generator is mounted to the accessory gearbox. 9. The assembly of claim 8 further comprising a first bearing rotatably supporting the shaft and the PMG and exciter are located on the shaft between the first bearing and the main machine. 10. The assembly of claim 9 wherein the first bearing is located on the shaft between the pinion gear and the PMG and the exciter. 11. The assembly of claim 10 further comprising a second bearing rotatably supporting the shaft. 12. The assembly of claim 11 wherein at least one of the PMG, exciter, and main machine is located on the shaft between the first and second bearings. 13. The assembly of claim 12 wherein the PMG is located on the shaft between the exciter and the pinion gear. 14. The assembly of claim 13 wherein the first bearing is located on the shaft between the PMG and the pinion gear. 15. The assembly of claim 14 wherein at least one of the PMG and exciter is located within the accessory gearbox when the starter/generator is mounted to the accessory gearbox.