KA350 Aircon / Pressurisation Flashcards
What components are supplied by the Pneumatic system?
Pneumatic - Hour Meter De-Ice boots - Inflation Hydraulic reservoir Cabin door seal Bleed air warning Window defog & pressure guage
What components are supplied by the Vacuum system?
De-ice boots - Deflation
Pressurisation controller
Where does the negative pressure for the vacuum system originate?
Bleed air exhausted overboard through a venturi provides suction (-ve pressure)
Explain how the bleed air warning system provides warning to the Pilot that there is a leak and what annunciators illuminate?
Each bleed air line has a parallel plastic tube that will melt when exposed to a bleed air leak above 200F triggering a pressure switch. If pressure drops below 2 PSI then a [L / R BLEED FAIL] warning comes on.
What are the BOLDFACE actions for a [L / R BLEED FAIL] warning?
BLEED AIR VALVE (affected eng)___PNEU & ENVIR OFF
[L BL AIR OFF] or [R BL AIR OFF]___ILLUMINATED
CABIN VSI and PNE PRESSURE___MONITOR
BRAKE DE-ICE(if installed)___OFF
WIll the [L / R BLEED AIR] Annunciator extinguish after the bold face is completed?
NO
What is the normal operating pressure range of the Pneumatic system?
12-20 PSI
What is the normal vacuum range of the Vacuum system ABOVE 15000ft?
- 3”-5.9” (BELOW 15K)
2. 8”-4.3” (ABOVE 15K)
Name the actions involved in the Bleed Air Valve Check. Include expected gauge and annunciator indications
L BL AIR SWITCH___PNEU & ENVIR OFF
Pressure/sucion in limits, no warnings
R BL AIR SWITCH___PNEU & ENVIR OFF
Pressure/suction to 0, [L / R BLEED AIR FAIL]
L BL AIR SWITCH___OPEN
Pressure/suction in limits, warnings extinguish
R BL AIR SWITCH___OPEN
What position would the bleed air switches need to be in for only the pneumatic system to operate?
ENVIR OFF
What 3 switches in the system will prevent the Air Conditioning compressor from operating?
Under Pressure, Over Pressure & RH Engine speed switch (N1 < 62%)
What are the functions of the safety valve?
Pressure Dumps air in the event of outflow valve failure (limits cabin alt to 13500ft)
Positive pressure relief
Negative pressure relief
What is the maximum neative differential pressure for the KA350?
0.0 PSID
What is the maximum positive differential pressure for the KA350?
6.6 PSID
What altitude is set on the presurisation controller prior to takeoff?
Cruise Altitude plus 1000ft OR Arrival airfield elevation plus 500ft, whichever is greater
What position should the rate knob be set to prior to takeoff and prior to descent?
11 - 1 o’clock position
To what altitude is the pressure controller set prior to descent?
500ft above Airfield pressure altitude
What are we looking for in the After Takeoff checks for the pressurisation checks?
Cabin Climb is lagging VSI climb, Cabin Alt is laggin cabin diff needle.
If the ambient temperature is greater than 10°C what position must the environmental bleed air switch be in for takeoff?
LOW (to increase power in hot temps)
What is the advantage of placing the environmental bleed air switch o Normal?
Increased heating or efficient pressurisation flow
When would the window de-fog be of assistance?
Descending from cold environment into warm mositure laden air
Name the actions required to perform the pressurisation check.
ENVIRONENTAL BLEED AIR\_\_\_NORMAL BLEED AIR VALVES\_\_\_OPEN PRESSURISATION CONTROLLER\_\_\_SET CABIN PRESSURE SWITCH\_\_\_HOLD TEST CABIN ALT & VSI\_\_\_CHECK FOR DESCENT CABIN PRESSURE SWITCH\_\_\_RELEASE PRESSURISATION CONTROLLER\_\_\_SET
When the CABIN TEMP MODE selector is in the MAN COOL position, how is the cabin temperature lowered?
Hold the MAN TEMP INCR-DECR switch to Decrease for 1 min to fully close the Left bypass valve.
At what altitude will the CABIN ALT HI annunciator illuminate?
12000ft
