PIPER
COMANCHE
SERVICE
MANUAL
2. Resistor Method:
(a) Connect a 15-ohm resistor to the sender unit terminal
of
the gauge being checked. (See
Figure S-IO.)
CAUTION
Make certain the sender resistor
is
connected to the proper side
of
the gauge.
(b) Connect a 14-volt power supply to the electrical system
of
the airplane.
(c) Operate the power supply and ascertain the gauge indicates one-half full.
(d) Repeat the procedure using a
30-0hm resistor which should cause the gauge to indicate full.
(e)
If
the gauge does not indicate proper:y, it should be replaced.
S-lOb. Removal
of
Fuel Sender.
a.
Remove screws attaching the oval cover plate to the top
of
the wing.
b.
Disconnect electrical leads from the sender unit.
c.
Remove screws and washers attaching sender
to
mounting plate and remove sender.
8-IOc. Installation
of
Fuel Sender.
a. Place the sender unit gasket
on
mounting plate and install sender.
b.
Secure sender to mounting plate with washers and screws.
c. Connect electrical leads
to
sender.
d. Install cover plate and secure with screws.
8-11.
Repair
of
Fuel Cell.
CAUTION
No repairs are
to
be made
on
the radius
of
a cell or in the fitting area of a
cell. Cells with such damage are to
be
returned
to
the factory for repairs. No
damaged areas such as cuts and tears larger than I inch are
to
be repaired in
the field.
a.
Outside the Cell.
I.
Use a piece
of
synthetic rubber coated fabric (U.S. Rubber Co. 5200 outside repair material)
large enough to
COver
damage
at
least 2 inches from
CUI
in any direction. Buff this material lightly and
thoroughly with fme
emery cloth (ISO grit) and wash with Methyl Ethyl Ketone solution (U.S. Rubber Co.
3339) to remove buffing dust.
2.
Cement buffed side
of
patch with two coats
of
U.S. Rubber Co. 3230 cement or Minnesota
Mining Co. EC-67S. Allow each coat to dry
10
to
15
minutes.
3.
Buff cell area to be patched lightly and thoroughly with fine emery cloth and wash with 3339
solution to remove buffing dust.
4. Cement buffed area with two coats
of
U.S. Rubber Co. 3230 or Minnesota Mining Co. EC-678
cement. Allow each coat
to
dry
10
to
15
minutes.
5. Freshen cemented area
of
patch and cemented area
of
cell with 3339 solution.
6. While still tacky, apply edge
of
patch to edge
of
cemented area
on
the cell. With a
Revised:
8115198
FUEL SYSTEM
2Jl
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