20
Twin Otter ARF Assembly Manual
Cowling, Propeller and Spinner
Installation–EP
Parts Required
Wing panels (left and right)
#2 x 1/4-inch woodscrews (8)
Cowlings (2)
2 1/4-inch spinners (2)
Propellers (2)
Propeller adapters (2)
Tools Required
Ruler
#1 Phillips screwdriver
Pin vise
Felt-tipped pen
1/16-inch drill bit
5/64-inch drill bit
Tapered reamer
Low-tack tape
Step 1
Apply a 2 1/2-inch long piece of low-tack tape to the
aft edge of the cowling on both sides. Align it flush to
the aft edge and just above the blue trim line.
Step 2
Use a felt-tipped pen to mark a line on the tape 1/4
inch forward of the aft edge.
Step 3
Measure 5/8 and 2 1/4 inches above the top of the
blue trim line and make two marks with a felt-tipped
pen.
Step 4
Use a 1/16-inch drill bit in a pin vise to drill a hole at
each of the marked locations. Remove the tape.
Step 5
Place the cowling on the nacelle and use the trim
stripes as an alignment guide. Secure the cowling to
the nacelle with low-tack tape.