Slingsby BGA 782, Руководство пользователя, Страница: 26 / 35

Handbuch Slingsby T21 - BGA 782
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RIGGING
DIAGONALS
7. Check the diagonal measurements with
a tape measure, observing the following
points :-
(I) Always select exacUy oppo,ite points
when taking port and starboard
measuremen ts.
(2)
Pull the tape to the same degree of
tautness Cor opposite measurements.
(3)
Note that the limits given on fig.
I
are
not exceeded.
MAIN·PLANE INCIDENCE
8.
To check the incidence of the main
plane, procecd
as
Collows :-
(I)
Hold the incidence board, Part No.
21B /4
so that it rests on its two
lc�s on the top surface oC one
of the malO plancs, at rib No.
1
(the
root rib), with the long rectangular
leg in contact with the leading' edge.
Place a straightedge on top of the
incidence board and a spirit level on
top of the straightedge.
The in­
cidence is correct if the straightcdge is
level. If it is not level. raise the lower
end of the straightedge by inserting
packing between its bottom edge and
the extreme end of the incidence
board, until the straightedge is level.
(2)
Measure the amount of packing in­
serted ; the incidence is within per­
missible limits if it does not exceed
U
in. A corresponding adjustable­
level reading, taken direct from the
top edge of the incidence board, is
o
deg. ± i deg.
(3) Using incidence board, Part No.
21B /4/1,.
on the same .main plane
at nb No.
14,
repeat the procedure
given at sub-para. (I) and
(2),
(4)
Using incidence board, Part No.
21B 14/2,
on the same main plane at
rib No.
25,
repeat the procedure given
at sub-p.ra.
(I)
and
(2).
At this
position the thickness of the packing
must not exceed
It
in. (adjustable­
level reading
0
deg.
±
!
deg.).
(5)
Check the other main plane at similar
positions.
Note , . .
The angle of incidmce of the port
main plane must 1LOl differ from that
of llse starboard main plane by more
than i deg . .. thtr<fore, if the packing
used under the straighledges on the port
and starboard sides (at similar positions
along the main plane) are bo�A at tile
sanu: ePld of the incidence board the
difference between the two must not
exceed :-
Inboard position Rib No.
I-it
in.
Mid-wing position Rib No.
14-n
in.
Outboard positiot� Rib No.
25-1.
in.
If the
!
aCkillgs are at opposite ends the
sum
0 the two 111ust not exceed
:
­
Inboard posilio1L-u in.
M id w;"g positi01L-U it�.
Ol,tboard positio"�1r in.
MAIN·PLANE D I H EDRAL
9. To check the dihedral of the main plane,
proceed as follows :-
(I) Place a dihedral board, Part No.
21B/4/3,
on one of the main planes
so that the longer leg rests on the
nose ply at rib No.
2
and .the shorter
leg at rib No.
8
(the inboard end of
the spoiler) : it must be parallel to,
and approximately
16
in. aft or, the
leading edge. Place a straightedge on
top of the dihedral board and check
witli a spirit level. The dihedral
is
correct if thr. straightcdge is level. If
it is not level, raise the lower end of
the straightedge by inserting packing
at the extreme cnd oC the dihedral
board until the straightedge is level.
(2)
Measure the amount oC packing In­
serted, the dihedral is within per­
missible limits if it does not exceed
n
in. A corresponding adjustable­
level reading taken direct from the
top edge of the dihedral board, is
0
deg.
±
t
deg.
(3)
Cheek the dihedral of the other main
plane in
a
simiLar manner.
Note . . .
The dihedral auglc of the port m.ain
plane flU�st Mt differ from the starboard
mai" plane by 1II0re than 1 deg. ,' there­
Jore, if the, packing used 1mder lite
straigMedges on the port and starboard
sides afe both at the same end (;J the
dihedral board (both olttboard or both
inboard) lh, difference oelluem the two
must 1�Oe excet:d
u
in. If the packings
are at opposite ends the
sum. of tlae two
must not e.tceed u in.