THRUSH AIRCRAFT INC – MODEL S2R R1340
AIRCRAFT MAINTENANCE MANUAL
5-8
Effective: 01/01/08
Fuel Strainer Service Instructions
Service the fuel strainer per the following
instructions.
A. Turn airframe fuel shutoff valve to
“OFF” position. Cut, remove and
discard safety wire (not shown)
securing the wing nut on one of the
bowl retaining studs.
B. Unscrew the wing nut until the bowl
retaining bar can be removed. Be
careful not to drop the lower housing
cover.
C. Remove the lower housing cover and
pull out the fine mesh double filter
screen.
D. Clean and rinse screen free of
accumulated contaminants using
gasoline or other solvent. A
toothbrush or other fine brush may
help dislodge debris.
DO NOT scrape, pry or
poke mesh surfaces with
sharp objects.
E. Inspect and clean fuel filter housing
as necessary.
F. Replace filter screen with the cone
pointing down.
G. Put lower housing cover back in place
and then position the cover retaining
bar. Tighten the wing-nut as tight as
possible with finger pressure only.
H. Secure the wing nut to the filter
housing with .032” stainless steel
lock wire.
I. Turn airframe fuel shutoff valve to
“ON” position. Turn fuel boost pump
on and observe 6 PSI on fuel
pressure gauge. Observe fuel filter
assembly for leaks prior to closing
filter access panel.
FUEL SYSTEM MAINTENANCE AND
REPAIR
Polysulfide sealants to AMS-S-8802
(formerly MIL-S-8802) may be used as a
thread seal or to seal minor connection
leaks throughout the fuel system. Apply
sparingly to male fittings only. Make sure
that any sealing compound or residue
from a previous seal, or any other foreign
matter, does not enter the fuel system.
Protect all drain openings
and fuel outlet screens
when applying sealant.
Any structural repair that breaks the fuel
tank integrity will necessitate resealing of
that area of the tank. To the greatest
extent possible, repair parts requiring
sealing should be installed with faying
surfaces coated with “B” type sealant
and rivets or other fasteners installed
immediately.
Fasteners in the fuel tanks are always
installed wet. That is, their shanks and
under the head is coated with “B” sealant
prior to installation. After installation,
some sealant will have squeezed out
around the ends. Smooth this out and
add more to completely seal the fastener
ends as shown in Figure 5-4. Use a tool
or a latex gloved finger for smoothing,
not a bare finger. Do not clean up
excess sealant with solvent.
USE OF FUEL PROOF
SEALANTS
Any sealant that meets AMS-S-8802
(formerly Mil-S-8802) standards is
acceptable for sealing fuel system
components as well as other areas
where contaminant ingress needs to be
prevented. This is a polysulfide fuel
resistant sealant used on integral “wet
wing” fuel tanks as well as other areas
subject to contact with aircraft fuels,
lubricants, oils, agriculture chemicals,
water and/or weathering. They can be
painted when cured.
CAUTION
CAUTION
