CH 5 ADVERSE WEATHER Flashcards
Anti-ice Systems Usage
Activate anti-ice (engine cowl and wing systems) prior to entering icing conditions (refer to
Limitations section of this manual) or when ice is detected by the ice detection system.
WHEN IS AN A/C COLD SOAKED
Cold soaked is defined as an aircraft in ambient temperature of -30°C (-22°F) or below for
more than 8 hours. Cold soaking is the effect of cold fuel in the tanks causing moisture to be
present on the upper and lower wing surfaces. If fuel temperature is 0°C (32°F) or below, it is
possible to have clear ice or frost on the wing with the ambient air temperatures above
freezing. The wing surfaces must be below freezing temperatures for frost to form, even
though the ambient temperatures may be above freezing.
WHEN IS A RWY CONSIDERED WET
cause it to appear reflective, but without significant areas of standing water.
***NOTE A runway with standing water would be a contaminated runway.
WHEN MUST WE USE A/I FOR TAKE OFF
When an aircraft is wet due to light rain or mist and the icing definition of “visible moisture”
and “less than 5°C (41°F)” is satisfied. The limitations require the use of wing antiice
for takeoff `
If the aircraft is wet because it has been cleaned with hot water but there is no visible
moisture in the air, then the wing is at the same risk of being contaminated
CAN WE DEPART WITH FROST ON THE A/C
YES UP TO 1/8 INCH ON UNDERSIDE OF WING AND WITH FROST ON THE UPPER PORTION OF THE FUSELOGE
WHEN IS A RWY CONSIDERED CONTAMINATED
A runway is considered to be contaminated, when more than 25% of the runway
surface area (whether in isolated areas or not), within the required length and
width being used, is covered by more than 1/8 inch of standing water or slush, or
its equivalent in slush or wet snow.
MAX STANDING WATER FOR T/O AND LAND 700-900
T/O 12.7 mm
(0.50 in)
LAND 19.1 mm
(0.75 in)
MAX SLUSH FOR 700-900 T/O AND LAND
T/O 15.0 mm
(0.59 in)
LAND 22.4 mm
(0.88 in)
MAX WET SNOW FOR T/O AND LAND 700-900
T/O 15.0 mm
(0.59 in)
LAND 22.4 mm
(0.88 in)
MAX DRY SNOW FOR T/O AND LAND
T/O 76.2 mm
(3.00 in)
LAND 95.3 mm
(3.75 in)
MAX CROSSWIND ON A SLIPPERY RWY 200/700
When landing on a
wet runway, a 27-knot crosswind is generally considered maximum for the CRJ 200/
700.
MAX CROSS WIND ON A SLIPPERY RWY FOR 900
A 22 knot crosswind is generally considered maximum for the CRJ 900.
If the runway
is known to be slippery (snow or ice covered), a crosswind component of 15 knots
should be the maximum
AFT CARGO OVHT EICAS Message`
When the AFT CARGO OVHT message is shown, the AFT CARGO Switch should be left in
the COND AIR position and both PACKS should be selected ON in cooling mode. This will
provide cool air to the cargo compartment and the message will disappear as soon as
temperature reaches 29 ± 2°C (85 ± 5°F).
Turbulence Penetration (RECOMMENDED PROCEDURES)
AUTO PILOT ON / ENGAGE TURB MODE
AIRSPEED: The maximum recommended airspeed for turbulence penetration
is 280 KIAS or 0.75M whichever is less.
Select CONT IGNITION to ON.
advise the Flight Attendants
TURN SEAT BELT SIGN ON
FLIGHT THROUGH VOLCANIC ASH
REDUCE TRHUST
TURN ON WING AND COWL A/I
MONITOR ITT
IF ITT RISES CONTINUOUSLY WITHOUT AN INCREASE IN THRUST SHUT ENGINE DOWN
*** AFTER ENGINE COOLS DOWN RESTART IT
