TM 1-1510-223-10 8-22           Change 3 b.   AUTO PROP anti-ice switch — ON (mo- mentarily). Check for PROP AMP meter shows indication and the overhead DC % LOAD meter shows a rise. c.   MANUAL  PROP  anti-ice  switch  —  ON. (momentarily). Check for loadmeter rise. d.   SURFACE    deice    switch    —    SINGLE CYCLE  AUTO.  Check  for  drop  in  pneu- matic pressure and wing deice boot infla- tion, and after 6 seconds for a second drop in pressure. e.   SURFACE   deice   switch   —   MANUAL. Check that surface boots inflate and re- main   inflated   while   switch   is   held   in MANUAL. Release switch and check that the boots deflate. f.   ANTENNA    deice    switch    —    SINGLE CYCLE AUTO. Check for a drop in pneu- matic  pressure  and  antenna  deice  boot inflation. g.   ANTENNA   deice   switch   —   MANUAL. Check that boots inflated, and remain in- flated, then OFF. h.   RADOME anti-ice switch — ON. Check for loadmeter  rise  and  pneumatic  pressure drop, then off. 10.  Pneumatics/vacuum/pressurization — Check as follows: a.   PNEUMATIC   PRESSURE   gage/GYRO SUCTION gage — Check in green arcs. b.   CABIN ALT controller — Set 500 feet low- er than field pressure altitude. c.   Cabin pressurization RATE control — Set to maximum. d.   ENVIRO   &   PNEU   BLEED   AIR   valve switches (2) — ENVIRO & PNEU off. e.   Pneumatic   pressure   gage/gyro   suction gage — Check. Pressure should drop to zero. f.   BL  AIR  FAIL  OFF  annunciators  (2)  — Check illuminated. g.   BL AIR FAIL annunciators (2) — Check illuminated. h.   CABIN PRESS switch — TEST (hold). i.   LEFT PNEU & ENVIRO BLEED AIR valve switch — ON. j.   L BL AIR OFF annunciator — Check extin- guished. k.   L  and  R  BL  AIR  FAIL  annunciators  — Check extinguished. l.   PNEUMATIC   PRESSURE   gage/GYRO SUCTION gage — Check in green arc. m.   CABIN CLIMB indicator — Check for de- scent indication within approximately 10 - 15 seconds, then release test switch. n.   LEFT PNEU & ENVIRO BLEED AIR valve switch — Off. o.   Repeat steps i. through n. using the right bleed air valve. p.   CABIN PRESS switch — Set to pressure position (center). q.   CABIN  ALT  controller  —  Reset  as  re- quired. r.   Cabin pressurization RATE control — Re- set as required. s.   PNEU   &   ENVIRO   BLEED   AIR   valve switches (2) — ON. CAUTION If windshield anti-ice is needed prior to takeoff, use NORMAL setting for a minimum of 15 min- utes prior to selecting HIGH temperature to pro- vide adequate preheating and minimize effects of thermal shock. 11.  Windshield anti-ice — As required. WARNING Do not operate the weather radar set while per- sonnel  or  combustible  materials  are  within  18 feet of the antenna reflector. When the weather radar set is operating, high-power radio frequen- cy energy is emitted from the antenna reflector, which can have harmful effects on the human body and can ignite combustible materials. Do not operate radar in congested.