BEECHCRAFT King Air C90
Equipped With:
•
Swept Blade Turbofan Propellers
•
Dual Aft Body Strakes
•
Increased Gross Weight
•
PT6A-28 Engines
Revision IR: August 15, 2017
3-1
Document No. 16-206CGW-28
Section III – Emergency Procedures
SECTION III — EMERGENCY PROCEDURES
ELECTROTHERMAL PROPELLER DE-ICE
Operation in icing conditions with abnormal readings on the de-ice ammeter are not recommended
and ice removal cannot be assured. Normal Operation: 18 to 24 amps.
1. Zero Amps:
a. Breaker Switch - CHECK.
b. If OFF, reposition to ON after 30 seconds.
c. If ON with zero amps, system is inoperative. Position switch to OFF.
2. Zero to 18 Amps:
a. Continue operation.
b. If propeller imbalance occurs, increase RPM briefly to aid in ice removal.
3. 24 to 29 Amps:
a. Continue operation.
b. If propeller imbalance occurs, increase RPM briefly to aid in ice removal.
4. More than 29 Amps:
a. Avoid icing conditions, since continued operation of the system cannot be assured.
b. Do not operate the system, except in emergencies.
c. Restrict time of operation to a minimum.
