CHAPTER 53
PAGE 12
PAGE DATE: 7. July 2010
MAINTENANCE MANUAL EXTRA 300LT
5 Install bottom cowling attachment screws (one on either
side) without cowling present (see two outer circles in
Figure 7).
6 Loosen clamp screws on gascolator drain and fuel pump vent
lines for easy access (see inner dotted circles).
7 Prepare PR-812 firewall sealant by mixing brown part A with
black part B with weight ratio 2.5:100.
8 Clean areas (from inside and outside) with solvents at four
positions pointed out by the arrows in figure 7. Immediately
thereafter, dry these areas with a new dry cloth.
9 At the gascolator drain (position A) seal the remaining gap
between firewall and bottom fuselage cover from inside and
outside with PR-812 firewall sealant. Minimum sealant
thickness approximately 1/8 inch (= 3 mm).
10 Repeat step 9 at positions B, C and D.
11 Cure for at least 24 hours at room temperature.
12 Fasten clamp screws on gascolator drain and fuel pump vent
lines.
13 Remove the two bottom cowling attachment screws.
14 Reinstall main fuselage cover, landing gear cuffs and engine
cowling in accordance with this chapter.
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