ECS Exam Flashcards
Temperature, Pressure and Density at sea level?
15 degrees C
14.7 psi or 1.0132 bar
1.225 kg/m3
2 parts of a heat exchanger?
Primary (pre cooler)
Secondary (inter cooler)
With regards to RAM air control valve, which port receives servo air pressure from the conditioning system via the canopy seal system?
Inlet
With reference to the cold air unit lubrication system, what is the mechanism that causes oil to transfer from the absorbent material into the sump and lubricate the bearings?
scroll pump
What do scroll pumps do?
Create a depression caused by the rotation, drawing oil into the scroll pumps to the bearings
What does the pressure control and discharge valve do?
Control the pressure of air within the aircraft cabin by controlling the flow of air out of the cabin
What are the 2 capsules in a pressure control and discharge valve and what do they do?
Absolute capsule -evacuated and sealed
Differential capsule - senses true ambient pressure through a pipe from below the cockpit floor
What do the 2 capsule movements allow?
the adjustment of the control valve so that the cabin altitude increases at a lower rate than aircraft altitude
With reference to cabin conditioning, what component, that when opened, provides air from the engine compressor tappings?
Pressure Reducing Shut Off Valve
When the aircraft has NO weight on wheels and the canopy is LOCKED, the solenoid will be …. so the supply through to the canopy seal and onto the canopy will be ….. and the seal will be ….
Deenergised
Open
Inflate
When the aircraft has WOW activated, the solenoid will …., the canopy will … allowing the seal to …
Energise
Close
Deflate
What is the purpose of the outward relief valve?
Opens to prevent over pressurisation of the cabin should the pressure control valve fail
What is the purpose of the inward relief valve?
opens and prevents negative pressurisation of the aircraft cabin in the event of rapid descent
What are the operating sequences of the inward and outward relief valves?
Normal Flight conditions
Outwards relief
Inwards relief
Manual outwards relief
All personnel tasked with carrying out cabin pressure testing must ensure what?
Completed type specific cabin pressure testing
Currently medically cleared to carry out cabin pressure testing
Consider themselves medically fit
Personnel taking part in testing must not what?
Undertake more than 1 differential pressurisation in a 12 hour period
Conduct further pressure tests for at least 12 hours
Fly for 12 hours after a period of pressure testing
Undertake Diving for 6 hours before or 12 hours after
Up to how many thousand feet is the cabin pressure the same as atmospheric pressure?
8,000 ft
Maximum pressure differentiation happens at what feet and what is the max psi?
25,000 ft
4 psi
In what climate does ambient air get mixed with cold air from the cooling pack?
Warm climate gives cabin conditioning
How is cooling achieved to activate dipping sonar or troop seats within rotary wing aircraft?
Use of an independent air intake boosted by fans
Personal Equipment Connector located?
Port side of pilot
Which of these are currently fitted to the seat?
Emergency Oxygen
On/Off Toggle
Communications
Personal Locator Beacon
Emergency Oxygen
On/Off Toggle
Communications
Which separate items can be found on the combined service unit?
Pressure controller NOT PRESSURE REDUCER
On/Off toggle
Flow Transmitter
Low pressure Warning switch
What does the Plenum chamber allow?
Temperature to stabilise and reduce pressure fluctuations during high breathing rates
