Battery Box Corrosion Prevention; Voltage Regulators And Overvoltage Relays Removal And Installation - Piper PA-44-180 SEMINOLE Maintenance Manual

BATTERY BOX CORROSION PREVENTION.

Check the battery for spilled electrolyte or corrosion at least every 30 days, but not later than each 50 hour
inspection, whichever comes first. Remove the battery and remove any corrosion found in the box, on the
t e rminals, on or around the battery by the following procedure:
1. Remove the box drain cap from the underside of the fuselage and drain off any electrolyte that may
have overflowed into the box.
DO NOT ALLOW BAKING SODA TO ENTER BATTERY.
2. Clean the battery and the box. Neutralize corrosion effects by applying a solution of baking soda and
water mixed to the consistency of thin cream. Continue application until bubbling action has ceased.
3. Rinse the battery and box with clean water and dry.
4. Place the cap over the battery box drain.
5. Install battery. (Refer to battery installation.)
VOLTAGE REGULATORS AND OVERVOLTAGE RELAYS. (S/N 44-7995001 thru 44-8195026 and
all PA-44-180T's.)
REMOVAL OF VOLTAGE REGULATORS AND OVERVOLTAGE RELAYS. (S/N 44-7995001 thru
44-8195026 and all PA-44-180T's.)
The voltage regulators and overvoltage relays are mounted on a panel that is secured to the left bulkhead at
F.S. 35.000. They are accessible by opening the aircraft nose section. The top units are connected to the left
engine alternator and the bottom units are connected to the right side.
1. Identify the voltage regulator or overvoltage relay to be tested.
2 . Remove the wires connected to the unit and label or otherwise identify them to facilitate their connection.
3. Remove the mounting screws. The unit is now free to be removed from the panel.
INSTALLATION OF VOLTAGE REGULATORS AND OVERVOLTAGE RELAYS. (S/N 44-7995001
thru 44-8195026 and all PA-44-180T's.)
1. Position the unit on the panel and secure it with the mounting screws.
DO NOT INTERCHANGE REGULATOR LEADS. THIS
WILL DESTROY REGULATOR AND VOID WARRANTY.
2. Connect the wires to the proper terminals.
LAMAR MODEL NO. B-00288-1 REGULATOR COMPONENTS.
Alternator output voltage can be controlled, within limits of the design capability of the alternator, by
properly varying the average level of current flow in the rotor winding. The Lamar solid state electronic
r e gulator is well suited for this purpose. Because of its design, the alternator, has self-limiting current characteri stics
and needs no current-limiting element in the regulator.
1. Transistor: The transistor (Symbol "Q") is an electronic device which can control the flow of current
in an electric circuit. It has no mechanical or moving parts to wear out.
2. Rectifier Diode: The rectifier diode (Symbol "D") will pass current in only one direction (forward
direction); and in this respect it may be compared to a check valve.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— CAUTION —
— CAUTION —
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Revised: June 20, 1995