Wind Turbine Machine Head Evaluation Page 1 of 32 Appendix I. Sketch of 1.5XLE (from GE literature).

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1 Wind Turbine Machine Head Evaluation Page 1 of 32 Figure 1 Sketch of 1.5XLE (from GE literature). Figure 2 Sketch of 1.5XLE (from GE literature).

2 Wind Turbine Machine Head Evaluation Page 2 of 32 Figure 3 image). viewed through windshield at accident scene (GE provided Figure 4 image). viewed through windshield at accident scene (GE provided

3 Wind Turbine Machine Head Evaluation Page 3 of 32 Figure 5 Left side of machine head. Figure 6 Front of machine head; nacelle fractured at bottom center.

4 Wind Turbine Machine Head Evaluation Page 4 of 32 Figure 7 Machine head identity marking on right front of nacelle. Figure 8 Right side of machine head with nacelle scrape marks and penetrations.

5 Wind Turbine Machine Head Evaluation Page 5 of 32 Figure 9 Penetration in nacelle near the right rear. Figure 10 Penetration in nacelle right side near the center.

6 Wind Turbine Machine Head Evaluation Page 6 of 32 Generator Top Box Gearbox Lube oil pump motor Figure 11 Left side of machinery space viewed to the rear. Top box (control panel) in right background.

7 Wind Turbine Machine Head Evaluation Page 7 of 32 Heat exchanger Heat exchanger exhaust duct Generator Figure 12 Aft end of generator with heat exchanger discharge duct through nacelle; viewed from the right side.

8 Wind Turbine Machine Head Evaluation Page 8 of 32 Pillow block main bearing Gearbox elastomeric mounts Yaw drives Figure 13 Left side of machinery space viewed to the front. Pillow block bearing in the background.

9 Wind Turbine Machine Head Evaluation Page 9 of 32 Slip ring Brake disc Lube oil pump Lube oil filter Flex coupling Figure 14 Gearbox viewed from the left rear.

10 Wind Turbine Machine Head Evaluation Page 10 of 32 Generator Heat exchanger air inlet Brake hydraulic power unit Brake caliper Bake disc Cat walks Brake disc & flex coupling guards removed by GE Gearbox Figure 15 Right side of machinery space viewed to the rear. Generator and heat exchanger inlet fan in the background.

11 Wind Turbine Machine Head Evaluation Page 11 of 32 Oil Cooler Pillow block main bearing Gearbox elastomeric mounts Yaw drives Figure 16 Right side of machinery space viewed to the front. Pillow block bearing in the background.

12 Wind Turbine Machine Head Evaluation Page 12 of 32 Figure 17 Oil cooler forward of gearbox with blue flex duct separated from nacelle. Figure 18 Pillow block main bearing viewed from the left side.

13 Wind Turbine Machine Head Evaluation Page 13 of 32 Figure 19 Close-up view of main pillow block bearing left side bolting. Figure 20 Left front yaw drive mounted on bedplate viewed through catwalk cutout.

14 Wind Turbine Machine Head Evaluation Page 14 of 32 Figure 21 Tower cables coiled below main shaft viewed from the left side. Figure 22 Tower cables coiled below main shaft. Bent shipping legs at arrow.

15 Wind Turbine Machine Head Evaluation Page 15 of 32 Figure 23 Fractured left front bottom of nacelle. Viewed to the front below the catwalk. Yaw gear at arrow. Figure 24 Bent shipping legs attached to the yaw gear.

16 Wind Turbine Machine Head Evaluation Page 16 of 32 Figure 25 Bent shipping legs attached to the yaw gear.

17 Wind Turbine Machine Head Evaluation Page 17 of 32 Left rear yaw drive Left center nacelle attachment Left front yaw drive Left front nacelle attachment Figure 26 Left side of nacelle viewed to the rear below the catwalk level.

18 Wind Turbine Machine Head Evaluation Page 18 of 32 Bedplate Connector Nacelle bracket Figure 27 Left front nacelle attachment viewed to the rear. Bolting not moved. Bedplate Nacelle bracket Connector Figure 28 Left front nacelle attachment viewed from above. Bolting not moved. Connector not bent.

19 Wind Turbine Machine Head Evaluation Page 19 of 32 Figure 29 Left center nacelle attachment viewed from above. Nacelle bracket Bedplate Connector Figure 30 Left center nacelle attachment viewed from above. Bolting not moved. Connector not bent.

20 Wind Turbine Machine Head Evaluation Page 20 of 32 Figure 31 Front of Top Box viewed to the rear.

21 Wind Turbine Machine Head Evaluation Page 21 of 32 Figure 32 Left side interior of Top Box.

22 Wind Turbine Machine Head Evaluation Page 22 of 32 Nacelle bracket Top Box Connector Top Box support connected to generator frame Figure 33 Left rear nacelle attachment adjacent to Top Box. Figure 34 Left rear nacelle attachment. Bolting moved on nacelle end of connector.

23 Wind Turbine Machine Head Evaluation Page 23 of 32 Figure 35 Left front generator mount. Figure 36 Left front generator mount. Generator frame attachment bolting not moved.

24 Wind Turbine Machine Head Evaluation Page 24 of 32 Figure 37 Left front generator mount. Elastomeric insert bolting moved. Figure 38 Left rear generator mount.

25 Wind Turbine Machine Head Evaluation Page 25 of 32 Figure 39 Left rear generator mount. Generator frame attachment bolting not moved. Figure 40 Left rear generator mount. Elastomeric insert bolting moved.

26 Wind Turbine Machine Head Evaluation Page 26 of 32 Nacelle bracket Connector Right rear generator mount Generator frame Figure 41 Right rear nacelle attachment. Figure 42 Right rear nacelle attachment. Connector bent. Nacelle bracket bolting moved.

27 Wind Turbine Machine Head Evaluation Page 27 of 32 Figure 43 Right rear generator mount. Generator frame attachment bolting not moved. Figure 44 Right rear generator mount. Elastomeric insert bolting moved.

28 Wind Turbine Machine Head Evaluation Page 28 of 32 Figure 45 Right front generator mount. Generator frame attachment bolting not moved. Elastomeric insert bolting moved. Figure 46 Right front generator mount. Elastomeric insert bolting moved.

29 Wind Turbine Machine Head Evaluation Page 29 of 32 Slip ring Brake disc Flex coupling Right center nacelle attachment Figure 47 Flex coupling area viewed from the right side. Figure 48 Right center nacelle attachment. Connector bent. Nacelle bracket bolting moved.

30 Wind Turbine Machine Head Evaluation Page 30 of 32 Figure 49 Right rear gearbox mount bolting. Typical of right front gearbox bolting. Figure 50 Right front yaw drive.

31 Wind Turbine Machine Head Evaluation Page 31 of 32 Figure 51 Main pillow block bearing right side bolting.

32 Wind Turbine Machine Head Evaluation Page 32 of 32 Right front yaw drive Nacelle bracket Connector Bedplate Figure 52 Right front nacelle attachment viewed to the rear.