ENVIROMENTAL SYSTEM Flashcards
1
Q
Janitorial combustion heater
A
- located forward fuselage
- controlled using three-position switch
- fuel from left fuel tank 1/2 gallon per hour
- electrical fuel pump, pumps fuel from left tank
2
Q
How does the janitorial combustion heater operate?
A
- turning ON the system, fuel flow starts and ignites the heater
- draws in outside air
- uses a spark plug and fuel to create “high velocity whirling flame”
- heat from flame will heat air moving around the shroud
- heat should be felt right away
- like a house heater maintains the proper temperature setting
3
Q
How to operate heater properly?
A
- AIR INTAKE partially or fully open
- HEATER ON
- three position switch set to CABIN HEAT
- DEFROST OPEN position
4
Q
Overhead vents
A
- ram air through vents on outside
- air blower
- moves air into overhead vents
5
Q
Heat on ground
A
- no ram air
- blower will blow air from outside into heater while on ground
- blower shuts off when up-limit switch is depressed on nose wheel (gear up)
- FAN switch for fresh air on ground
6
Q
Safety switches
A
- prevents both fan & heater operations when air intake lever is CLOSED
- LDG gear retracted micro switch turns off ventilation blower cabin air is circulated by ram air
7
Q
Overheat switch
A
- acts as a safety feature to shut off heater during a malfunction
- HTR OVRHEAT CAS
- HTR OVER TEMP illuminates, can only be reset on the ground by maintenance
- it’s a red button in the nose compartment that maintenance will reset
8
Q
Turning off the heater in the air
A
- heat switch off
- air intake open 15 seconds
9
Q
Turning off heater on the ground
A
- heater switch to fan position for 2 minutes
- allows heater to cool down
10
Q
Ventilation (ground)
A
- heat is not desired on ground
- switch to FAN
11
Q
What does the micro switches do when LDG is retracted?
A
- when landing is retracted micro switches turns off ventilation blower
- inflight cabin air is circulated by ram air pressure only
12
Q
Where does the janitorial combustion heater get air for combustion?
A
- there is a hole on the right side of the nose cone where air enters the janitorial system for combustion
13
Q
Why is the janitorial combustion heater dangerous?
A
- it’s like a bomb
- produces a high velocity flame
- prone to failures
- has a safety overheat switch
14
Q
How is heated air distributed?
A
- by a manifold, ducts along cabin floor to outlets on each seat
15
Q
Ventilation (in the air)
A
- air intake open and heater off
- ram air
16
Q
Overhead ventilation
A
- each occupant of each seat can control outlet on ceiling for fresh air
