Anti-Collision Strobe Lights; Strobe Light Removal; Strobe Light Installation; Strobe Light System Troubleshooting - Piper PA-44-180 SEMINOLE Maintenance Manual

ANTI-COLLISION STROBE LIGHTS.

These lights are located in the wing tips and are part of the same assembly as the navigation lights. They
are rated to flash at approximately 45 to 50 times a minute and are both supplied by one power supply.
REMOVAL OF STROBE LIGHT.
DUE TO THE PRESENCE OF HIGH VOLTA G E, MAKE
C E R TAIN THE MASTER SWITCH IS O F F W H E N
W O R KING ON THE STROBE LIGHTS.
1. Remove the screw securing the navigation lens and remove the lens.
2. Remove the three screws securing the navigation light bracket assembly and pull out.
3. Remove the strobe lamp by cutting the wires on the lamp beneath the mounting bracket.
4. Remove the defective lamp.
5. Remove and discard the plug with the cut wires from its electrical socket.
INSTALLATION OF STROBE LIGHT.
1. Route the wires from the new lamp down through the hole in the navigation light bracket.
2. Insert the wire terminals in the plastic plug supplied with the new lamp. Wire according to the
schematics located in Chapter 91 of this manual.
3. Position strobe lamp on navigation light bracket.
4. Secure navigation light assembly and bracket with appropriate screws.
5. Install navigation lens and secure with appropriate screw.
TROUBLESHOOTING STROBE LIGHT SYSTEM.
The strobe light flashes as a result of capacitor discharge triggered by a timing pulse. The capacitor is
charged to 450 volts D. C. by the power supply, then discharges across the xenon flash tube at intervals of
approximately 45 to 50 flashes per minute. The trigger pulse is generated by a solid state timing circuit in the
power supply.
When troubleshooting the strobe light system, determined if the trouble is in the flash tube or the power
s u p p l y. Replacement of the flash tube will confirm if the tube is defective. A normally operating power
s u pply will emit a 1 to 1.5 kHz audible tone. If there is no sound emitted, check the system according to the
f o llowing instructions. When troubleshooting the system, utilize the appropriate schematics in Chapter 91.
The power supply is accessible through the access panel in the baggage compartment, aft of F.S. 191 .000.
WHEN CONNECTING THE POWER SUPPLY INPUT, DO NOT REVERSE
CONNECTIONS. REVERSED POLARITY OF THE INPUT VO LTA G E ,
FOR JUST AN INSTA N T, WILL DESTROY A PROTECTIVE DIODE IN
THE POWER SUPPLY, CAUSING IT TO SELF-DESTRUCT FROM
O V E RHEATING. THIS DAMAGE IS SOMETIMES NOT IMMEDIATELY
APPARENT, BUT WILL CAUSE FAILURE OF THE SYSTEM IN TIME.
1. Ensure the input voltage at the power supply is 14-volts
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— WARNING —
— CAUTION —
2I11
33-43-03
Page 33-4
Revised: June 20, 1995