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Ground proximity altitude advisory system | Up
TM-1-1510-225-MTF Army Model C-12 Aircraft Manual | Next
BEFORE TAKEOFF |
TM 1-1510-225-MTF
PROCEDURE
ENGINE RUNUP (CONT)
TROUBLESHOOTING
REFERENCE
19. Pressurization - Check and set.
(a) BLEED AIR VALVES - Both
OPEN.
(b) Cabin altitude - Set 500 feet
lower than field pressure altitude.
(c) CABIN PRESS switch - TEST.
Cabin climb indicator indicates a
descent.
(d) CABIN PRESS switch - Release.
Cabin climb indicator indicates a
climb, then stabilizes at zero
climb.
(e) Altitude selector - Set airport
elevation plus 500 feet or cruise
altitude plus 1000 feet, which-
ever is higher.
* 20. Anti-ice/deice systems - Check as fol-
lows:
(a) CONDITION levers - LOW
IDLE.
(b) Prop deice
- Check. When
MANUAL mode is selected, note
rise on DC loadmeter. When
AUTO mode is selected, monitor
prop ammeter for 90 seconds and
ensure the indicator remains in
the normal operating range the
entire time.
(c) FUEL VENT heat - Check. Note
slight rise on loadmeter.
(d) Windshield heat - Check. Note
increases on the loadmeter as
cycle heats through both normal
and high settings.
2-40
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