Annunciator Panel Light Bulbs Replacement; Vacuum/Gyro Air Sensor Switch Removal And Installation; Overboost Sensor Switch Removal And Installation; Electric Clock - Piper PA-44-180 SEMINOLE Maintenance Manual

REPLACEMENT OF ANNUNCIATOR PANEL LIGHT BULBS.
Replacement of a bulb does not require removal of the annunciator panel. The lenses are designed to be a
friction fit in the annunciator panel and the light bulbs fit into the back side of the lenses. To replace a defective
bulb, simply pull the lens out of the annunciator panel. Withdraw the defective bulb from the lens and replace
with a new bulb. Align the key on the lens with the key way on the annunciator panel socket and press the lens
into position.
REMOVAL AND INSTALLATION OF VACUUM/GYRO AIR SENSOR SWITCH.
The vacuum/gyro air switch for each engine is mounted on the pressure regulator attached to the aft side of the
firewall.
1. Remove nacelle panels as necessary to gain access to the sensor switch.
2. Note the position of the wires on the sensor switch, then disconnect the wires from the switch.
3. Unscrew the sensor switch from the pressure regulator.
4. If a new switch is not to be installed immediately, cover the opening to prevent dirt or other foreign matter
from entering.
5. Install the switch in reverse order given for removal.
REMOVAL AND INSTALLATION OF OIL PRESSURE SENSOR SWITCH.
For removal and installation procedures, refer to Chapter 79.
REMOVAL AND INSTALLATION OF CARBURETOR ICE SENSOR PROBE.
For removal and installation procedures, refer to Chapter 30.
REMOVAL AND INSTALLATION OF OVERBOOST SENSOR SWITCH.
The manifold pressure overboost switches are built into the manifold pressure gauge and are not field
serviceable. Should it be determined that a problem exists within the gauge, the gauge must be removed and sent
to an authorized repair station. (Refer to Chapter 77 for removal and installation procedures.)

ELECTRIC CLOCK.

The standard electric clock is a Borg Instruments CA-7287 which receives its power from the aircraft battery.
The clock is mounted in the upper left corner of the instrument panel.
Available as an option is the control wheel mounted Astrotech LC-2P electric chronometer. This clock also
receives its power from the aircraft battery.
For electrical schematic, refer to Chapter 91.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2L1
3 9 - 1 3 - 0 0
Page 39-05
Revised: May 15, 1989