Ice Detector Probe Functional Check; Ice Detection System Diagram; Lift Detectors - Piper PA-44-180 SEMINOLE Maintenance Manual

B865
CARBURETOR
PROBE
R. ENGINE
KNIFE
CONNECTORS
RED
WHITE
BLACK
FUNCTIONAL CHECK OF ICE DETECTOR PROBE.
1. Aircraft master switch on.
2. Ice detector system on.
3. Adjust the sensitivity knob until the red light (ice light) goes out. This is the critical setting.
4. Turn the ice detector system off, then on. The red light should flash on then off indicating that all
components are operating normally.

LIFT DETECTORS.

Two heated lift detectors and a heated pitot head installed on the left wing are controlled by a single ON - OFF
type PITOT HEAT switch located on the switch panel to the left of the pilot. The lift detectors have a pull type
25 amp circuit breaker marked "Lift Det Heat", except on aircraft S/N 44-95001 and up, they have a 5 amp
circuit breaker marked "Stall Det", and are not heated. This may be pulled to deactivate the lift detectors increase
load shedding is required due to an alternator failure. The lift detectors have an in-line resistor activated by the
main gear squat switch which limits the ground electrical load to approximately 25 percent of the innight load.
This allows the pitot heat and lift detectors to be activated prior to takeoff.
For removal, installation and adjustment of lift detectors refer to Chapter 27.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
L. ENGINE
WARNING LAMP
R. ENGINE
ARP
ANNUNCIATOR
107.AP
FUSE
RED
BLACK
+12 V
RED - R. ENGINE - TO POSITION 1 ON
GROUND
ANNUNCIATOR PANEL CONNECTOR
Figure 30-15. Ice Detection System (Pa-44-180 Only)
PROBE
PANEL
KNIFE
CONNECTORS
RED
WHITE
BLACK
BLACK - L. ENGINE - TO POSITION 4 ON
ANNUNCIATOR PANEL CONNECTOR
2F6
CARBURETOR
L. ENGINE
3 0 - 9 0 - 0 0
Page 30-50
Revised: May 15, 1989