STEMME S12, Maintenance Manual

Page: 164 / 290

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: --
CHAPTER- PAGE 7-6
MAINTENANCE MANUAL STEMME S12
7.1.3.3 HORIZONTAL TAIL
• Check forward fitting for cracks and corrosion, tight fit of screw connection, smooth op-
eration of spring bolt (observe section »6.5 Lubrication«), backlash of bolt and sufficient
spring tension for safe locking.
• Check rearward fitting for cracks, especially in or close to welding seams and the cut-outs
of the fixing plates, tight fit of screw connection and wear of pins.
• Check nut of the assembly screw stop.
• Check backlash of the horizontal tail fitting (do not apply excessive force):
- Move horizontal tail tip forward and aft and up and down.
- Take hold of the mid section of the horizontal tail fin, push up and down.
If excessive backlash is found, the bolts and fittings must be measured.
MAXIMUM BACKLASH OF HORIZONTAL TAIL FITTINGS
Forward fitting Vertically 0.15 mm / 0.006 in Horizontally 0.1 mm / 0.004 in
Rear fitting Vertically 0.15 mm / 0.006 in Horizontally 0.15 mm / 0.006 in
7.1.3.4 WEIGHTS AND STATIC HINGE MOMENTS OF CONTROL SURFACES
Upon repair and re-painting the control surfaces weights and static hinge moments must be
measured. If the limits are exceeded, contact the manufacturer.
Weights and Hinge Moments: See section »6.4.2«
Deflections: See section »6.4.1«