BBD-700 Integrated Air Management Flashcards
What is the pack discharge temperature range for manual mode operation?
+5° C to + 60° C
One pack must be selected “off”
What is Normal and Maximum Cabin differential pressure?
Normal – 10.33 PSID
Maximum – 10.73 PSID
“Delta P” message – 10.85 PSID
What is the maximum negative relief differential pressure?
-0.5 PSID
On taxi and takeoff the cabin PSID should not exceed this value?
0.1 PSI
On landing the cabin PSID should not exceed this value?
1.0 PSID
AUX PRESS is prohibited above what altitude?
41,000 Feet
The Bleed Management Controllers (BMCs) extract bleed air from which engine ports?
5th stage low-pressure port
8th stage high-pressure port
During ground operation, what is the priority bleed source for engine starting?
APU bleed air
How are hot air (bleed) leaks monitored in the airplane?
Dual loop detection sensing elements connected to the BMCs
What occurs when the BMC detects a bleed air leak?
The BMC isolates the affected manifold by closing the appropriate valves
How is air flow regulated from the pneumatic duct to the air conditioning units?
By modulation of the flow control valve (FCV) by the air conditioning system controllers (ACSC)
Can one engine supply two AC packs simultaneously?
No, the BMC prevents two packs from being supplied by one engine
In the case of single pack operation, the high flow schedule is automatically selected by the BMC
What are the two functions of the air conditioning units?
Decrease the air temperature and
Decrease the water contained in the hot bleed air
When are the packs automatically shut off (FCV closed)?
Bleed failure, shutdown or engine starting Ditching operation (below 15,000 feet) Pack inlet overheat Compressor discharge overheat Pack discharge overheat or under pressure
Turning the TRIM AIR switch to the ON position opens which valves?
Hot air shutoff valves (HASOV)
What are the two functions of the RAM AIR system?
Provide cooling for the heat exchangers of the cooling packs
Alternate source of fresh air at an altitude of 15,000 feet or less
What are the requirements for using AUX Press?
Both cooling packs inoperative
Recirculation system maintained “ON”
Prohibited above 41,000 feet
What are the typical cabin altitudes for 51,000 and 45,000 feet aircraft altitude?
51,000 feet – 5,670 feet
45,000 feet – 4,500 feet
What are the two modes of operation with the cabin pressure control system in AUTO?
PRIMARY mode (predictive) uses FMS programmed Autopilot and VNAV engaged SECONDARY mode (reactive) uses Pressure altitude Vertical speed
What are the warning messages and associated cabin altitudes for loss of pressurization?
CAB ALT – 8200 Feet
CAB ALT Warning – 9000 Feet
Or 1000 / 1800 Feet above landing alt if landing above 7230 MSL
When selecting MAN pressurization, what is displayed on the STAT page
Both outflow valve position indicators
Cabin rate analog gauge
What is required to display the LDG ELEV in magenta on the STAT page?
LDG ELEV FMS/MAN selector set to FMS
Landing destination programmed in the FMS
Flight plan activated
What are the two cabin rate selections available in automatic and associated rates?
Normal mode – 500 ft/min climb and 300 ft/min descent rate
High mode- 800 ft/min climb and 800 ft/min descent rate
What occurs when EMER DEPRESS switch is selected ON?
Both out flow valves (OFVs) are commanded open
Cabin altitude limited to 14,500 feet
What does the selecting the Ditching switch to “ON” provide?
PACKS flow is shut off
Cabin is depressurized
OFVs are driven to the closed position
Sequence is inhibited above 15,000 feet
What is the purpose of the safety valves (SFV 1 and 2) located in the aft bulkhead?
Ensures overpressure and negative pressure relief
Provides an OPEN position signal to the EICAS
