Piper COMANCHE PA-24-180 Service Manual page 503

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 8-10.)
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-ohm resistor which should cause the gauge to indicate full.
(e) If the gauge does not indicate properly, it should be replaced.
8-10b. 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.
8-10c. 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.
1. 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 cut in any direction. Buff this material lightly and
thoroughly with fine emery cloth (180 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-678. 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: 8/15/98
FUEL SYSTEM
2J1