(14)
Do a Test of the Smoke Detector Installation (AMM 26-16-01/201).
S 717-011
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(15) Close cargo doors (AMM 52-34-00/201).
TASK 26-16-00-107-012
3. Clean the Smoke Detector Tubes in the Cargo Compartment (Fig. 701)
_______________________________________________________
A. General
(1)
This section includes two procedures, Methods 1 and 2, which can be used to clean the air sampling tubes for the smoke detector.
(2)
Method 1 provides a more thorough cleaning procedure than Method 2 and is suggested for smoke detection systems having a greater degree of contamination.
B. References
(1)
AMM 26-16-01/201, Cargo Smoke Detector - Maintenance Practices
(2)
AMM 26-16-00/501, Cargo Smoke Detection System - Adjustment Test
(3)
AMM 25-50-03/401, Bulkhead Lining - Removal/Installation
(4)
AMM 52-34-00/201, No. 1 and No. 2 Cargo Doors
C. Equipment
(1)
A pneumatic air source which can supply dry,
filtered compressed air (Maximum pressure of 30
PSI).
(2)
A vacuum source which can supply a maximum
vacuum of 15 inches of water.
D. Consumable Materials
(1)
Soft bristle brush
(2)
Tube brush
(3)
Soap and water
E. Access
(1)
Location Zones
121/122 Forward Cargo Compartment
153/154 Aft Cargo Compartment
211/212 Flight Compartment
820 Lower Half of Fuselage
(2)
Access Panels
821 No. 1 Cargo Compartment Door
822 No. 2 Cargo Compartment Door
F. Clean the Smoke Detector Tubing - Method 1
S 017-063
(1)
Open applicable cargo doors (AMM 52-34-00/201).
(2)
Remove all the smoke detectors (AMM 26-16-01/201).
S 037-014
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(3) Remove the applicable cargo lining panels (AMM 25-50-03/401) to get access to the tube assembly at the smoke detectors, air sampling tube end caps, and orifices.
NOTE: Not all air sampling tubes have end caps.
____
S 177-016
(4) For the tube assembly at the smoke detectors, do the steps that follow:
(a)
Remove the clamps and straps, and disconnect the tube assembly from the tubing system.
(b)
Use a tube brush, soap and water to remove all of the
contamination and debris from the tube assembly.
(c)
Rinse fully and air dry the tube assembly. Use a wet vacuum to catch any excess water.
(d)
Make sure the rubber tubes, straps and clamps are not damaged. Replace them if necessary.
S 037-017
(5) Remove all of the caps from the ends of the air sampling tube.
S 167-052
CAUTION:_______AIR SAMPLING ORIFICE DIAMETERS HAVE CRITICAL DIMENSIONS. DO NOT INSERT ANY CLEANING DEVICES WHICH MAY ALTER THE DIMENSIONS OF THE ORIFICE.
(6)
Remove all remaining contamination and debris from the ends of the air sampling tube and adjacent orifices.
S 147-038
(7)
For tubes with end caps, remove all remaining material from the inner wall of the sampling tube directly across from the orifice. Use a mechanical probe if necessary.
S 167-020
CAUTION: REMOVE ALL OF THE SMOKE DETECTOR ASSEMBLIES AND THE END CAPS
_______ BEFORE YOU BLOW THE SYSTEM. IF NOT, THIS CAN CAUSE DAMAGE TO THE EQUIPMENT.
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