STEMME S12 User Manual

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 733
MAINTENANCE MANUAL STEMME S12
7.4.10.5 INSTALLATION OF THE PROPELLER UNIT
• Clean and degrease the propeller and the propeller gearbox ange with an appropriate
solvent. The torque is transmitted by friction t, therefore, the surfaces must be even, clean
and free from grease.
• Inspect threaded bushings in the propeller gearbox ange for visible damage.
•
Push carbon brushes fully into their supports and temporarily x with adhesive tape
(or similar) to avoid damage to the brushes and their supports when the hub is tted to
the gear ange.
•
Tighten the M8 bolts securing the hub to the gear ange, using a torque wrench on
opposing pairs of bolts in two steps:
- Step 1: Torque 10 Nm / 7.4 lbf ft
- Step 2: Torque 30 Nm / 22.1 lbf ft
Secure groups of three bolts together using safety wire (diameter 0.8 mm / 0.03 in).
•
Mount variable pitch mechanism to the hub centerpiece (18) and fasten with bolts
(two M6 bolts with locking washers). Pay attention to red marks.
• Release carbon brushes and check contact and appropriate pressure on the respective slip
rings.
•
Bolt the drive pin (10) onto both sides of the fork (4). Attach M5 bolts rst and then
screw on the M8 bolts loosely, then tighten the loose adjustment screw (25) and secure
with lock nut. Then tighten the M5 bolt and the M8 nut (using a torque wrench, torque
20 Nm / 14.7 lbf ft). Secure the adjustment screws with safety wire.
NOTICE
If necessary, bolt the counter- balancing weight washer back at the inside of the fork.
If both adjustment screws are loose at the beginning of this step, the propeller must be adjusted
again (see section 7.4.10.7 Checking of Pitch Control and Adjusting the Variable Pitch Propeller).
• Connect the power supply to the electric element on both sides.
• Screw on both sides of the electric covers.
• Screw on the front cover of the variable pitch mechanism. Observe red marking (red point
must correspond to “red side” of the variable pitch propeller).
• Install nose-cone (reverse sequence of removal, do not forget locking).
•
Check adjustment. If tolerances are not met, re-adjust propeller pitch (see section
7.4.10.7 Checking of Pitch Control and Adjusting the Variable Pitch Propeller).

STEMME S12 Specifications

General

Brand	STEMME
Model	S12
Category	Aircrafts
Language	English