85-10-00 Reciprocating Engine Front System
85-10-10 Gearbox
85-10-11 Removal of the Gearbox
1. Apply a container with minimum 3 litres below the gearbox drain plug.
2. Open the gearbox filler plug [1].
3. Open the gearbox drain plug [2]
4. Remove the propeller – refer to the applicable Aircraft Maintenance Manual.
5. Remove the electrical connector [3] of the governor solenoid marked with “GOC/M55”
and secure the connector and the socket with a cap.
6. Remove the pressure line [13] from the governor (If the pressure line is installed) -
refer to the applicable Aircraft Maintenance Manual.
7. Remove the electrical connector of the gearbox temperature sensor [5] market with
“GBTS/B50/5” and secure the connector and socket with a cap.
8. Remove all clamps [14] of the cable fixation for the crankshaft sensor.
9. Remove the engine starter –refer to Chapter 80-00-11.
10. Install forward engine hinge [6] for slinging the engine (if not installed).
11. Sling the engine on the forward hinge and apply slow force.
12. Open and remove the right [7] and left [8] forward engine mounts - refer to the
applicable Aircraft Maintenance Manual.
13. Support the gearbox or sling the gearbox on the prop shaft.
14. Remove the gearbox screws [9] (11x).
Four different types of screws are used. Mark screws for correct position before removing.
15. Remove the gearbox [10].
16. Remove the governor [4]– refer to Chapter 79-00-141
85-10-12 Installation of the Gearbox
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. Put the gearbox [10] in place in front of the engine.
3. Insert the 11 screws [9] on the gearbox and equally torque the screws with 22 Nm.
Four different types of screws are used. Make sure that the correct screws according to the
marking during removal are used.
4. Install the two forward engine mounts [7] and [8] to the gearbox - refer to the
applicable Aircraft Maintenance Manual.
5. Install the starter on the engine - refer to Chapter 80-00-12.
6. Connect the pressure line to the governor - refer to the applicable Aircraft
Maintenance Manual
7. Connect the electrical connector [3] “GOV/M55” to the governor solenoid.
8. Connect the electrical connector [5] of the gearbox temperature sensor marked with
“GBTS/B50)”.
9. Install all clamps [14] of the cable fixation for the crankshaft sensor.
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