CANOPY DEFOG SYSTEM

The fighter defog system provides the pilot with a means of distributing cabin air and for defogging the canopy. 

- Defog Does not Work In Manual. 
- 158 degrees MAX # 
+ Cabin Distributes through defog outlets 
+ keeps canopy clear & provides for crew comfort.

The outlets are part of the glare shield & direct air to the base of the windshield to prevent canopy fogging. 

+ w/ the lever in MIN there will be minimal flow of air to the diffusers.

This valve diverts supply air away from the cabin outlets & directs it to the defog outlets. 

- mechanically operated 
+ manually controlled by the defog lever.

Used to control the position of the defog air diverter valve. 

+ provides the pilot means to distribute the cabin air. 
- can be set at any pos. btwn MIN & MAX

MIN - air is directed to the cabin outlets. 

MAX - air is diverted form the cabin.

- two defog switches (S2 & S3)
+ located at the base of the defog lever. 
- actuated when the defog lever is moved to 3/4 to MAX pos. 
+ reroute current flow to provide high temp. air to the canopy.

- routes power through a bias resistor. 

-located in the 3-minute time delay module. 

> The bias resistor decreases current flow through the cabin temp sensor. 
   & into the cabin temperature sensor/controller. <

> The decrease in current flow causes the cabin temper
ature sensor/controller to signal the cabin temperature control valve to open & send 158 degrees air to the canopy. <

- routes power tot he 3- minute time delay module. 

> After 3 mins, the delay module will discharge and energize the defog relay. <

> Energizing the defog replay will now direct current flow away form the bias resistor and allow the cabin temperature sensor/controller to return temperature to its original settings.<

- contains a timer and a biasing resistor.

+ plug type module 
- located in the air conditioning matrix assembly. 
- w/ the temp selector in AUTO and the defog lever 3/4 to full MAX pos.
  IT will allow the cabin temperature sensor/controller to supply 158 degrees air to the canopy defog outlets for three minutes. 

+ charges for 3 mins
- energizes defog relay

- plug-in type relay
+ located in the air conditioning matrix assembly. 
- energized by 3-min time delay module 
+ directs current flow away form the bias resistor. 
- After 3 mins, the cabin air temp. returns to NORMAL. 

+ Allows Temp to Return to Original Setting

- no change in temp. 
- airflow to defog outlets increases as lever is moved fwd max pos.

-Time Display module discharges
- Energizes Defog relay 
- Power Diverted  from Defog

- Airflow to Defog outlets increasing.