(b)
Remove electrical power if no longer required.
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CONDITIONED AIR CONTROL - CLEANING/PAINTING
1. General
A. The operation of the temperature control and temperature indicating systems will not be optimum unless a representative sample of cabin air passes across the respective temperature sensor or temperature bulb. Since cabin air passing across the sensing devices must pass through tubing, any contaminants in the air will form a deposit on inlet grilles, sensing devices and inside the tubing. A periodic cleaning of these units will help to maintain the temperature control and indicating systems performance. If air cleaning of exhaust tubing does not provide adequate airflow across temperature sensing units it will be necessary to accomplish the liquid cleaning procedure.
B. The following provides cleaning instructions for passenger cabin and control cabin conditioned air control components.
2. Equipment and Materials
A. One of the following detergent solutions (Ref 20-30-31, Cleaners and Polishers):
(1)
Brulin Formula 815 MX - diluted 8 to 1 with water
(2)
NRG plus No. 678 - diluted as required with water
B. Freon 113 or Freon TF (Ref 20-30-31)
C. Clean and dry cheesecloth or cotton cloths and lint-free tissue
D. Soft bristle brush
3. Prepare for Cleaning
A. Remove air inlet grille (Ref 25-24-315). On carryall stowage bin airplanes with filter and advanced technology airplanes, separate filter from grille.
B. Remove temperature sensor and/or temperature bulb (Ref 21-61-31 and/or 21-62-21).
C. Remove passenger cabin temperature sensor fan for carryall stowage bin interior airplanes (Ref 21-61-34) and advance technology interior airplanes (21-61-35).
D. Remove control cabin temperature sensor (Ref 21-61-61).
4. Clean Conditioned Air Control Temperature Sensing Components
A. Moisten cloth with detergent solution and remove soil and stains from temperature sensor and temperature bulb (passenger cabin), temperature sensor (control cabin) probes. If stains persist use Freon 113, followed by detergent solution. Rinse with water-dampened cloth.
WARNING: AVOID FREON 113 OR FREON TF CONTACT WITH SKIN OR EYES. INGREDIENTS COULD CAUSE HARM AND DISCOMFORT. USE WITH ADEQUATE VENTILATION AND WEAR PROTECTIVE GLOVES.
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B. For passenger/cargo convertible and advanced technology interior airplanes' passenger cabin fans, clean exterior and interior walls of housing, motor and fan blades as outlined in step (A) using a soft bristle brush. Dry with a clean lint-free cloth or tissue.
CAUTION: DO NOT IMMERSE SENSOR ASSEMBLY OR MOTOR IN SOLUTION OR USE EXCESSIVE FREON 113 OR FREON TF TO CLEAN. DAMAGE TO MOTOR OR WIRING COULD OCCUR. DO NOT ALLOW CLEANER TO RUN INTO MOTOR HOUSING.
WARNING: AVOID FREON 113 OR FREON TF CONTACT WITH SKIN OR EYES. INGREDIENTS COULD CAUSE HARM AND DISCOMFORT. USE WITH ADEQUATE VENTILATION AND WEAR PROTECTIVE GLOVES.
C. Clean air inlet grille; filter, if installed, and control cabin case screen with detergent solution. Rinse with water. Squeeze moisture out of filter using dry cloth and wipe grille and screen dry.
NOTE: Grille and filter can be immersed in detergent solution to clean, and in water for rinse, if desired.
5. Air Clean Temperature Sensing Units Exhaust Tubing
A. Disconnect exhaust tube from control cabin temperature sensor case and from passenger cabin sensor duct on passenger/cargo convertible airplanes. Blow through tubing with shop air from sensor end of tubing.
6. Liquid Clean Temperature Sensing Units Exhaust Tubing (Passenger/Cargo Convertible Airplanes)
A. General
(1) The liquid cleaning procedure should be used only when cabin sidewall and overhead panels, galleys and other interfering furnishings are removed. Otherwise, access to exhaust tubing requires such extensive removal effort, the job should not be attempted unless absolutely necessary.
B. Disconnect exhaust tube from sensor box.
C. Gain access to complete exhaust tubing run (Ref par. 6.A.).
D. Disconnect tubing at joints and remove tube clamps; then remove tubing.
E. Vapor-degrease all tubing and flush inside of tubing with trichlorethylene.
F. Install tubing.
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