S 216-007
(2)
Do an inspection on the smoke sampling tubes in the lower forward, aft, and bulk cargo compartment.
S 216-003
(3)
Visually check that holes on the sampling tubes for obstructions and contamination with dirt.
S 166-004
(4)
If the hole is obstructed or contaminated, clean the sampling tube (Ref 26-16-05/701).
S 216-005
(5)
Make sure the rubber tubing and shrinkable tubing connectors, end caps and flex hoses are not cracked, worn, or damaged. Replace as necessary.
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747-400
MAINTENANCE MANUAL
LOWER CARGO COMPARTMENT SMOKE DETECTION TUBING - CLEANING/PAINTING
__________________________________________________________________
1. General
_______
A. This section contains the procedure to clean the smoke detection tubing manifolds in the lower cargo compartment.
TASK 26-16-05-107-001
2. Clean the Smoke Sampling Manifold
_________________________________
A. Standard Tools and Equipment
(1)
Air source - filtered, compressed, 30 psig maximum
(2)
Caps - for the inlet tubes on the detectors
(3)
Mechanical probe
(4)
Tube brush
B. Consumable Materials
(1) Soap and water solution - commercially available
C. References
(1)
AMM 26-16-00/501, Lower Cargo Compartment Smoke Detection System
(2)
AMM 36-00-00/201, Pneumatic System
(3)
AIPC 26-16-01 Fig. 1
(4)
AIPC 26-16-01 Fig. 2
D. Access
(1) Location Zones 122 Forward Cargo Container Compartment Forward Half RH 142 Aft Cargo Compartment RH
E. Procedure
S 867-002
(1)
Remove the pneumatic power (AMM 36-00-00/201).
S 027-026
(2)
Remove the applicable cargo lining to get access to the smoke detectors tubes.
S 037-003
(3)
Disconnect the sampling manifold from the smoke detectors.
(4)
Install caps on the inlet tubes on the detectors.
S 027-005
(5)
Remove the manifold tees and the applicable weldment assemblies from the manifold.
S 167-006
(6)
Use the soap and water solution and the tube brush to clean the tees and weldment assemblies.
S 867-004
(a) Flush the tees and weldment assemblies with water.
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747-400 MAINTENANCE MANUAL
(b) Let the tees and weldment assemblies dry.
(7) S 167-008Remove all unwanted material from the ends of the manifold and from the orifices in the manifold.
(8) S 167-009Use the mechanical probe to remove all the contamination from the inner wall of the manifold across from the orifices.
(9) S 437-010Install the tees in the manifold.
S 867-011
(10)
Apply pressurized air to each manifold at the end farthest from the detectors.
S 217-012
(11)
Make sure the rubber tubing and tubing connectors are not worn or damaged.
(a) If there are cracks, holes, or damage to the tubing or connectors, replace them.
S 437-014
(12)
Install all weldment assemblies that you removed.
S 037-015
(13)
Remove the caps from the detector inlet tubes.
S 437-016
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