Environmental System & associated Malfunctions/EP Flashcards
What is the cockpit pressurization schedule limit?
3.6±0.2 psi
When does the CKPT PX annunciator illuminate?
3.9 to 4.0 psi
Cockpit ΔP display changes to red & over pressurization safety valve opens at ______psi.
4.0 psi
Cockpit cooling is provided by a _________ with an engine driven compressor.
Vapor cycle system
Engine bleed air is utilized for which items?
Canopy pressurization seal, anti-G system, cockpit heating/defogging, pressurization, & OBOGS
The left side P3 port provides engine bleed air for which system?
OBOGS
For ground ops, a _____ supplies the necessary cooling air flow.
Blower
With weight off the landing gear, electrical power to the blower is terminated & _____ through the cooling air inlet is ducted to the heat exchanged
Ram air
When the air conditioning compressor is operating and the aircraft is below ____’ft MSL, the inflow valve is automatically closed regardless of the BLEED AIR INFLOW switch.
7,500’ft MSL
When the DEFOG is set to ON, the ______ valve is opened to maximize the volume of bleed air entering the cockpit
Inflow valve
True/False: If the bleed air temp exceeds 200°F, an amber DUCT TEMP illuminates.
FALSE, exceeds 300°F
The canopy seal/anti-G electrical shutoff valve is controlled by which switch?
BLEED AIR INFLOW switch
A _______ is incorporated into the system to protect anti-G valves from contamination.
Water separator
- A safety valve in the anti-G system will automatically provide pressure relief if the pressure exceeds ____psi.
7 psi
The temperature of air entering the cockpit is normally controlled automatically between ___°F & ____°F.
60°F & 90°F
If the temp controller detects a temp in excess of ____°F, it directs the heat exchanger bypass valve to move to full closed, forcing max bleed air through the heat exchanger.
165°F
What three things does placing the DEFOG switch ON do?
a. Defog valve opens, increasing bleed air supply
b. Inflow valve is automatically set to high, further increasing bleed air supply
c. Air conditioning compressor is automatically turned on to dry the air
If the DEFOG is switched OFF, the electrically controlled defog valve may take up to ___ seconds to close.
40 seconds
True/False: Operation of the canopy defog increases ITT for a given PCL setting.
True, adjust the PCL to maintain ITT within limits
As the aircraft approaches ____’ft pressure altitude, the control valve regulator will open and close the control valve to maintain cockpit pressure.
8,000’ft pressure altitude
An 8,000’ft ckpt altitude is maintained until a differential pressure of _____psi is reached at ______’ft.
3.6±0.2psi; 18,069’ft
What is cockpit pressure altitude at 31,000’ft?
16,600’ft
If cockpit pressure altitude rises above _____’ft, an amber ______ annunciator illuminates
19,000’ft; CKPT ALT
What happens when selecting DUMP on the pressurization control switch?
Removes power from dump solenoid, which opens it electrically and opens the control valve. Bleed air inflow continues.
What happens when selecting RAM/DUMP on the pressurization control switch?
Opens the control valve & fresh air valve, and closes the defog valve. Bleed air inflow continues.
What is powered on when the DEFOG switch is ON?
The air conditioning compressor
When is cockpit cooling air available?
a. engine running
b. generator is on line
c. generator bus is powered
d. AIR COND or DEFOG switch is ON
The _________ will be on anytime the AVIONICS MASTER switch is ON.
Evaporator blowers
The fresh air valve is automatically closed when approaching ____’ft pressure altitude.
8,000’ft pressure altitude
