Change 3 8-23
Do not operate the weather radar system in a
confined space where the nearest metal wall is
50 feet from the antenna reflector. Scanning
such surfaces within 50 feet of the antenna re-
flector may damage receiver crystals.
The weather radar system should be test before
each flight on which the system is to be used.
12. Weather radar Test and set as required:
a. RADAR mode selector switch SBY.
b. LSS mode selector switch SBY.
c. WX push-button selector switch (display
controller) Depress. Observe that EHSI
displays partial compass heading arc.
The radar transmitter is radiating X band micro-
wave energy when in the test (TST) mode.
TST. Observe that WX mode annunciator
on EHSI remains in STBY.
e. Range switches (radar control panel)
Depress both switches simultaneously.
Observe that WX mode annunciator on
EHSI changes from STBY to TEST, and
that magenta, red, yellow, and green are
displayed. A green noise band will appear
at the upper arc range marking.
f. RADAR mode selector switch SBY,
then as required.
g. Range switches (radar control panel) 50
NM or greater.
h. LSS mode selector switch CLR TST.
i. EHSI Verify that a white lightning rate
symbol appears at approximately 25 NM
at 45 degrees right of center and a magen-
ta lightning alert symbol is displayed at
maximum selected range at 45 degrees
right of center.
While the aircrafts weight is on the wheels, the
weather radar system is forced into the standby
mode. This is a safety feature that prevents the
radar from transmitting on the ground to elimi-
nate the microwave radiation hazard.
8-23. * BEFORE TAKEOFF.
1. AUTOFEATHER switch ARM.
2. PNEU & ENVIRO BLEED AIR valves (2) As
Pitot heat should not be used for more than 15
minutes while the aircraft is on the ground. Over-
heating may damage the heating elements.
3. ICE & RAIN switches As required. As a
minimum, PITOT, STALL WARN, and FUEL
VENT switches shall be ON.
4. Fuel panel Check fuel quantity and switch
5. Flight and engine instruments Check for
normal indications and EFIS display controller
is set to desired setting.
6. CABIN CONTROLLER Set.
7. Annunciator panels Check (note indica-
8. Flaps As required.
9. Trim Set.
10. ASE/ACS Set.
11. Avionics Set.
12. Flight controls Check.
13. Departure briefing Complete.
8-24. * LINE UP.
1. Engine anti-ice As required.
2. Engine AUTO IGNITION switches ARM.
3. PROP levers HIGH RPM.