ICE AND RAIN PROTECTION
Operation
Aircraft Operations Manual
11.2
PAGE
1
1.
LIMITATIONS
Unit
Min
Normal
Max
1.1
SYSTEM LIMITS
−
Windshield heating
Switching side windows direct from OFF
to HIGH is not authorized
Time in NORM before switching to HIGH
min
7
−
Pitot tubes
Time from switching STBY PITOT ON
until full ice
−
protection is obtained
min
5
−
Windshield wipers
In LOW position
kts
130
In HIGH position
kts
160
2.
NORMAL OPERATION
CONDITIONS
NORMAL PROCEDURES
2.1
GENERAL
During ground operation there might be transient drops in PROP RPM, below
the preset AC generator trigger level. If the drop lasts more than 7 seconds the
AC generator will trip and MASTER CAUTION / ICE PROT (CWP) lights will
come on together with AC GEN caution and other AC
−
powered system caution
lights in the overhead panel.
There are also cases where ice protection system caution lights will come on
without AC GEN caution light. This is due to an inherent warning system time
delay.
The AC generator will come on line automatically when PROP RPM increases,
and the engine INTAKE caution light will go out. However, the windshield
FRONT/SIDE and PROP caution lights can only be extinguished by resetting
the systems (switches selected to OFF and then to desired position).
Jun 01/19