DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 73 / 163

Maintenance Manual DG-808C
Issued: June 2005 4.12
4.8 Determination of the moments of the flaperons
Due to the flexibility of the flaperons and the large number of hinges it is very
difficult to determine correct values for the moments. For the measurement you
need a long flat working bench or a similar device. You must produce holders
according to drawing 8V96 (enclosed in this manual). One with 6.5 mm (1/4 in.)
diameter hole and 4 (or 5 for flaperons without parting) with 5.5 mm (0.22 in.)
diameter hole. Fit the holders to the flaperon hinge pins. Part 1 (6.5 mm dia) to
hinge 1 (at root). Other parts to hinges 4, 7, 10, 13 and 17 in case of flaperon
without parting.
Clamp the holders to the working bench with screw clamps. Remove the
flaperon and adjust all hinge points to be in line. A max. tolerance of + 0.5 mm
(0.02 in.) in up and down and fore and aft direction is allowed.
Fix the holders to the bench when in line. Install the flaperon again and measure
the load at the trailing edge at the root 122 mm (4.8 in.) behind hinge axis, see
sketch.
Start measurement at a 5 degree down position and lift the flaperon slowly to a
5° up position. Read spring balance. Lower the flaperon slowly to the 5° down
position. Read spring balance. The load will be lower. Use the average of both
values for the flaperon moment. Execute this measurement min. 3 times to be
sure that no measuring error occurs.
The difference between up and down value should be no more than 80 g (0.036
lbs.). Otherwise the friction is too high and must be reduced first to obtain a
reliable measurement.
part 2 part 2 part 2 part 1
122
loop of tape
Spring scale should have a max.
reading of 1 kg (10 N) or 2 lbs. 1
graduation should be 20 g (0.2
N) or 0.04 lbs.
8V96
spring scale
1 4 7 10