Starter - Oil System - Fuel System - AC/Pressurization Flashcards
What are the engine starter cranking limits?
1st and 2nd attempt
90 sec ON – 10 sec. OFF
3rd thru 5th attempt
90 sec ON – 5 min. OFF
What are the Dry Motoring limits?
1st attempt: 90 sec. ON – 5 min. OFF
2nd thru 5th attempt: 30 sec. ON – 5 min. OFF
What are the APU Starter limits?
No more than three start attempts in one hour,
2 minute delay required between start attempts.
Min Oil Temperature for start?
-40°C
Max Continuous Oil Temperature?
155°C
Max Permissible Oil Temperature?
163°C (15 minutes max)
Max Oil Consumption?
0.05 gallons/hr
Where do we check the oil quantity?
On the EICAS menu page
When should the Oil Capacity be checked?
3 minutes to 2 hours after shutdown
When should the Engine Oil level be replenished?
15 minutes to 2 hours after shutdown
Max refill without dry motoring?
2 quarts
How is the oil cooled?
Fuel/oil heat exchanger
What is the total quantity of the engine oil tanks?
7.2 quarts
How is the fuel moved from the center tank to the main tanks?
transfer ejectors
How is the fuel moved from the main tanks to the collector tanks?
scavenge ejectors
gravity line used as a backup
How is the fuel moved from the collector tanks to the engine driven high pressure fuel pump?
main ejectors
backed up by boost pumps
What is the function of the electric boost pumps?
To provide initial fuelmfor engine start and
to back-up the main ejectors
What is the flight deck indication of a high pressure fuel pump failure?
Engine flameout
What is the maximum fuel imbalance?
300 lbs for takeoff
800 lbs for all other phases
When will the fuel system automatically begin transferring fuel?
200 lb fuel imbalance
When are the boost pumps automatically energized?
Low pressure from the main ejectors
if the pumps are armed
Where is the high pressure fuel pump located?
N2 accessory gearbox
Where is bulk fuel temperature taken?
right main tank
What is the Minimum Bulk Fuel Temp for take-off (Jet A)?
-30°C
What is the minimum bulk fuel temp during flight (Jet A)?
above -40°C
How is engine fuel heated?
Fuel/oil heat exchanger
What is the minimum engine fuel temperature for takeoff?
+5°C
What is the takeoff limitation if the center tank has > 500 lbs of fuel?
Each main tank must have > 4400 lbs
Which Bus powers the refuel/defuel panel and refuel/defuel SOVs?
APU Battery Direct Bus
Where is the refuel/defuel panel located?
The fuselage forward of right wing
Where is the single point adapter located?
Right wing root
Normal pressure differential is?
8.5 psi
Max pressure differential is?
8.7 psi
Max pressure differential during taxi, takeoff and landing?
0.1 psi
Max negative pressure differential?
-0.5 psi
During single PACK operation, what is the max altitude?
CRJ 900/900EP: FL 250
CRJ 700: FL310
What does the DISPLAY COOL or ARINC COOL Caution messages mean?
Low airflow behind screens or within the avionics rack
How many pressurization controllers are installed on the CRJ 900?
2, PC1 and PC2
When do the pressurization controllers swap?
weight on wheels plus 3 minutes or
if one PC fails, the redundant controller takes over
When operating in the auto mode, what is the cabin rate of climb and descent?
500 fpm climb
300 fpm descent
When operating in the manual mode, what range is controlled by the MAN RATE knob?
50 fpm to 3000 fpm ± 1000 fpm
When will the primary page indicate a CABIN ALT Caution message?
Cabin altitude between 8,500 and 10,000 ft
When will the primary page indicate a CABIN ALT Warning message?
Cabin altitude >10,000 ft
When will CPAM automatically deploy the passenger oxygen masks?
Cabin altitude >14,000 ft
When will CPAM turn on the NO SMOKING/FASTEN SEATBELT signs?
Cabin altitude >10,000 ft
with switches in the AUTO position
Can we carry live animals in the cargo compartment of the CRJ 900?
Yes, Aft cargo compartment only.
What causes the FAULT portion of a PACK switchlight to illuminate?
Over pressure or
Over temperature condition
What causes the FAULT portion of the PRESS CONT switchlight to illuminate?
Both pressurization controllers have failed.
