09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
48
HORIZONTAL ATTACHMENT
NOTE:
Horizontal stabilizer must be installed before the vertical stabilizer
and rudder. The tail surfaces may be installed after painting.
1.
Fabricate bushings as shown in PARTS MANUAL DRAWING. Insert a bushing
into the slot of each incidence adjuster.
2.
Use the cap screws to set the bushings 1/8" from the bottom of the slots for Titan
and 1/8" from the top of the slots for 912 installations.
3.
Transfer drill the 2 mounting holes in the front spar and one in the aft spar to 1/4"
through the spar doublers.
4.
Set the horizontal stabilizer in place. Insert the bolts from inside the horizontal
(through the inspection holes) through the bushing and bulkhead.
5.
Insert the bolt to attach the aft spar to S-11. The hole for the other bolt is left out
of the rear spar of the horizontal stabilizer. This will be drilled out after the wings
are attached to the fuselage.
IMPORTANT:
Secure the incidence adjusters before flight by using thread
locker.
(AFTER WINGS ARE ATTACHED TO THE FUSELAGE AND BEFORE THE
ELEVATOR IS ATTACHED TO THE HORIZONTAL)
6.
Adjust the tilt of the horizontal stabilizer to match the wings. Use shims as
necessary to hold in place.
7.
Carefully transfer drill 1/4" hole from the S-11 to the Horizontal Stabilizer AFT
Spar.
8.
Make sure Horizontal Stabilizer is tight against the Incidence Adjustors on
Station-10.
9.
Check for gap between AFT Spar and Station-11.
10.
If gap exists, place Thick (AN960-416) and/or Thin Washers (AN960-416L) on
1/4
” Bolts between Aft Spar and Station-11 to remove gap.
HINT: Use small pieces of tape on a thin strip to position washers.
11.
Tighten the bolts attaching the aft spar to Station-11.
