Piper Navajo PA-31 Service Manual page 768

PIPER NAVAJO SERVICE MANUAL
b. Disconnect the three electrical connectors inside the wing tip.
c. Remove screw containing the ground wires.
d. Remove wing tip.
e. Remove other three screws mounting power supply to wing rib. Remove power
supply from aircraft.
1 1-133. INSTALLATION OF WING TIP STROBE POWER SUPPLY. (Serial Nos. 31-962
& up.)
a. Position power supply on wing rib (L or R), and secure with the three screws
previously removed.
b. Put wing tip in position on the wing leaving enough room to gain access to the inside
of the wing tip.
c. Insert other screw through the ground wire terminals; install and secure to strobe
power supply.
d. Connect the three electrical connectors inside the wing tip.
e. Position wing tip on wing and secure with the appropriate screws.
11-134. REMOVAL OF TAIL STROBE POWER SUPPLY. (Serial Nos. 31-962 & up.) The
tail strobe power supply is located inside on the bottom tail fairing.
a. Remove screws securing the bottom tail fairing, and lower the fairing just enough to
gain access to the two plugs connecting the strobe power supply to the rest of the system.
b. Disconnect the two plugs and remove bottom tail fairing with the strobe power
supply still attached.
c. Remove the screws securing the power supply to the bottom tail fairing. Remove
power supply.
11-135. INSTALLATION OF TAIL STROBE POWER SUPPLY. (Serial Nos. 31-962 &
up.)
a. Position the power supply in place on the bottom tail fairing and secure with the
appropriate screws.
b. Position the bottom tail fairing into place, leaving enough room to gain access to the
two plugs, and connect them.
c. Secure the bottom fairing into place with the appropriate screws.
11-136. TROUBLESHOOTING.
The strobe light assembly functions as a condenser
discharge system. A condenser in the power supply is charged to approximately 450-volts DC;
then discharged across the xenon flash tube at intervals of approximately 50 flashes per
minute. The condenser is parallel across the xenon flash tube which is designed to hold off the
450-volts DC applied until the flash tube is triggered by an external pulse. This pulse is
generated by a solid state timing circuit in the power supply.
Reissued: 10/12/79
ELECTRICAL SYSTEM
4D18