Shroud Drain Line Check
Figure 601
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28-13-21
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A 737-300/400/500MAINTENANCE MANUAL
A. Equipment
(1) Container - glass or clear plastic, 250 ml capacity (to collect the water and the fuel)
B. References
(1)
AMM 28-22-36/401, APU Fuel Feed Line Shroud
(2)
AMM 28-22-81/401, APU Fuel Feed Line
C. Access
(1) Location Zone
216 Left Main Wheel Well
D. Procedure
S 686-019
(1) Do these steps to drain the shroud drain line:
(a)
Find the drain valve for the APU shroud in the drain line (approximately 40 inches inboard of the drain mast).
(b)
Put the container below the drain valve.
(c)
Open the drain valve and let the fluid drain into the container.
(d)
Close the drain valve.
S 216-017
(2)
Examine the collected fluid for fuel.
S 796-018
(3)
If you find more than a small quantity of fuel in the collected fluid, do these steps:
(a)
Tighten the couplers for the APU fuel line (AMM 28-22-81/401).
(b)
Do a pressure check of the APU fuel line (AMM 28-22-36/401).
(c)
If it is necessary, replace the fuel line (AMM 28-22-81/401).
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A
737-300/400/500MAINTENANCE MANUAL
SHROUD DRAIN LINE - CLEANING/PAINTING
_____________________________________
1. General_______
A. This procedure has one task. The task is to clean the APU flame arrestor.
B. The flame arrestor is in the bottom, aft part of the left main wheel well. You can find it in the drain line at the coupler near the inner side of the airplane skin.
TASK 28-13-21-107-009
2. Clean the Flame Arrestor for the Drain Line for the APU Shroud (Fig. 701)______________________________________________________________
A. Equipment
(1)
Bucket - 5-gallon capacity
(2)
Air gun
(3)
Water - clean
(4)
Detergent
B. References
(1) AMM 28-22-15/401 Fuel Line and Couplings
C. Access
(1) Location Zone
216 Left Main Wheel Well
APU SHROUD
DRAIN LINE
VALVE DRAIN DRAIN LINE
BONDING JUMPER APU SHROUD DRAIN SEE A
APU FLAME ARRESTER SHROUD DRAIN (INSIDE TUBE COUPLING)
DRAIN MAST
A
Shroud Drain Flame Arrestor Cleaning
Figure 701
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737-300/400/500MAINTENANCE MANUAL
D. Procedure
S 027-000
(1) Do these steps to remove the flame arrestor (Fig. 701):
(a)
Find the flame arrestor in the drain line immediately upstream of the drain mast.
(b)
Disconnect the coupler which contains the flame arrestor.
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