10. Install the gearbox magnetic drain plug – refer to Chapter 85-10-22.
11. Fill the gearbox according to Chapter 85-10-51 General
12. Install the filling plug [1] with 12 Nm and apply safety wire according to the standard
practices.
13. Install the adequate propeller - refer to the applicable Aircraft Maintenance Manual.
14. Perform an engine ground run according to Chapter 71-00-03.
15. After the ground run check gearbox oil system for leakage.
85-10-13 Removal of the Gearbox with optional Gearbox Oil Cooler
1. Apply a container with minimum 3 liters below the gearbox drain plug.
2. Open the gearbox filler plug [01].
3. Open the gearbox drain plug [02].
4. Drain the coolant – refer to the applicable Aircraft Maintenance Manual
5. Remove the propeller – refer to the applicable Aircraft Maintenance Manual.
6. Remove the electrical connector [03] of the governor solenoid marked with
“GOC/M55” and secure the connector and the socket with a cap.
7. Remove the pressure line [13] from the governor (If the pressure line is installed) -
refer to the applicable Aircraft Maintenance Manual.
8. Remove the electrical connector of the gearbox temperature sensor [05] market with
“GBTS/B50/5” and secure the connector and socket with a cap.
9. Remove the electrical connector “CTS_GPC” of the coolant temperature sensor
“CTS_GPC” [15] (only “-A” engine configuration).
10. Remove the engine starter –refer to Chapter 80-00-11.
11. Loosen the spring band clamp [16] of the connecting hose [17].
12. Remove the coolant hose from the gearbox hose connector [18] which connects the
gearbox and the (cabin air) heat exchanger – refer to the applicable Aircraft
Maintenance Manual.
13. Install forward lifting eyelet [06] for slinging the engine (if not installed).
14. Sling the engine on the forward hinge and apply slow force.
15. Open and remove the right [07] and left [08] forward engine mounts - refer to the
applicable Aircraft Maintenance Manual.
16. Support the gearbox or sling the gearbox on the prop shaft.
17. Remove the gearbox screws [09] (11x).
Four different types of screws are used. Mark screws for correct position before removing.
18. Remove the gearbox [10] with the installed gearbox oil cooler and the connecting
hose [17].
19. Remove the oil cooler [19] – refer to Chapter 85-10-15
20. Loosen the second spring band clamp [20] and remove the connecting hose [17].
Remove the governor [04]– refer to Chapter 79-00-141
85-10-14 Installation of the Gearbox with optional Gearbox Oil Cooler
If the gearbox is replaced due to high debris contamination make sure that the parts
mounted to the gearbox and operated with gearbox oil (i.e. propeller, governor and
feathering accumulator if applicable) are properly purged before reinstallation.
1. Install the governor – refer to Chapter 79-00-142
2. Install the oil cooler – refer to Chapter 85-10-16.
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