CESSNA AIRCRAFT
COMPANY
SINGLE ENGINE
STRUCTURAL REPA
IR MANUAL
FIREWALL REPAIR
1. General
A. The firewall is constructed of 0.016 inch, 18-8 corrosion resistant, annealed stainless steel sheet.
(1) A typical firewall patch is illustrated in Figure 801.
(2) A typical repai
r to the interior firewall angle is illustrated in Figure 802.
2. Material
NAME NUMBER MANUFACTURER USE
Firewall Seal
ant
AMS 3374
Pro-Seal #700
-A Loctite Aerospace
Bay Point, CA 94565
Firewall sealant
3. Repairing the Firewall Assembly
A. Firewall sheets may be repaired by removing damaged material and splicing in a new section. The
splice must b
e lapped over the old material, sealed and secured with steel rivets.
(1) Patches, splices and joints must be repaired using MS20450 steel rivets.
B. Following any repair to the firewall assembly, seal the damaged areas as follows:
(1) Clean area on
surface to be sealed with methyl propyl ketone.
(2) Mix one part of catalyst thoroughly with 100 parts of Pro-Seal No. 700 base.
NOTE: Sealant shoul
d be mixed by weight. It is important that accelerator be completely and
uniformly dispersed throughout the base compound.
(3) Using a spatu
la, caulking gun, or flow gun, apply a fillet of sealer along cracks, seams, joints,
and rows of rivets.
NOTE: If the sealan
t is applied before the parts are mated, use enough sealing compound
to completely fill the joint, and wipe away excess after parts are mated.
NOTE: If the sealan
t is applied with a brush or a brush flow gun, more than one coat of sealant
will be necessary on very porous material. Sealant should be allowed to air-dry 10
minutes between coats.
53-40-00 Page 801
© Cessna Aircraft Company Jun 1/2005
To Next Page
Loading...
