STEMME S12 User Manual

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 731
MAINTENANCE MANUAL STEMME S12
Balancing the variable pitch propeller or its assemblies may only be performed by the
manufacturer or by an authorized and licensed FBO according to the specic instructions and
using appropriate equipment.
Balancing weights have to be applied for static or dynamic balancing. Their arrangement must
be entered in the Rigging Report as laid down in the Propeller Rigging Report form (Annex D).
In the case of damage of one propeller blade only, a suitable exchange blade may possibly be
obtained from the manufacturer. The latest Report of Adjustment Settings must be transmitted
to the manufacturer and in this case, re-balancing may not be necessary.
7.4.10.2 ADJUSTMENT AND INSPECTION RESULTS, TOLERANCES
Changes in pitch angle ß = 6° 24’ ± 15’
Settings, measurement taken at the propeller blade
mounting fork with reference to zero setting (this is
when the axis of the joint is parallel to the propeller
axis of rotation).
Take-O setting: -2° 30’± 5’
Cruise setting: +3° 54’± 10’
Initial tension of the contact spring for the take-o
position stop switch.
≈ 0.2 mm / 0.0079 in
(
1
/
3
turn of the contact screw)
Duration of pitch change in each direction at an ambient
temperature of 15° - 25° C and battery voltage of
not less than 12 V under loaded conditions.
max. 3 Min.
Unbalance: Permissible total static residual unbal-
ance.
Permissible dynamic unbalance.
200 g mm / 4.44 dr. in
see A17-10AP-V/2-E
Permissible travel of the blade tips in the direction
of ight.
4 mm / 0.16 in
Track at propeller blade joint (dierence between
both forks, measurement taken opposite the posi-
tion ‘upper left gear mount’).
0.3 mm / 0.12 in
Track at propeller blade tips (dierence between
both blades).
3 mm / 0.12 in
7.4.10.3 VISUAL INSPECTION OF THE PROPELLER UNIT
• Check load bearing elements (hub and forks, blade suspension) for cracks, corrosion and
other damage.
• Check complete propeller assembly for loose components, loose bolt connections or other
apparent damage.
• Check condition of rubber stops within the blades and on hub for cracks.
•
Check propeller blades for cracks or other damage, especially at blade tips, at bonding
seam and in the area of stop buers. Repair leading edge protection tape if necessary (use
material supplied by the manufacturer only!).

STEMME S12 Specifications

General

Brand	STEMME
Model	S12
Category	Aircrafts
Language	English