TM 1-1510-253-CL
a. Note fluctuation of deice gauge at
approximately 6 seconds (wings deflating
and horizontal stabilizer inflating) and
again at 10 seconds (horizontal stabilizer
deflating)
4. DEICE BOOT Switch -- AUTO
a. Note wing boots 6 sec empennage 4 sec
Extended ground operation will damage Pitot
& SAS heating elements.
5. PITOT & SAS HEAT Switches -- PITOT &
SAS
a. Note illumination of SAS DEICE
annunciator light and normal load
indicated on L & R Pitot Heat Load Meter.
b. Note selection of single switch will not
illuminate SAS DEICE annunciator light.
6. PITOT & SAS HEAT Switches -- PITOT
a. Note SAS Deice annunciator light out and
normal indications on L & R Pitot Heat
Load Meter
7. PITOT & SAS HEAT Switches -- OFF
Engine Intake Heat limited to 10 sec ground
operations above +5 C. Do not operate either
propeller deice boots or oil cooler duct heat
when propellers are static.
8. ENGINE & PROP HEAT Switches -- ON
a. Note rise in EGT and Intake Heat lights on
and Duct Heat Cycle Lights on and L & R
Prop Deice Load Meter
NOTE
Duct Heat Cycle Lights may not illuminate at
ambient temperatures above 90F.
9. ENGINE & PROP HEAT Switches -- OFF
P-13