38-31-00
ALL ú ú 01 Page 206 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
WASTE WATER DRAIN MAST - REMOVAL/INSTALLATION
_____________________________________________
1. General_______
A. This procedure has two tasks. The first task removes the drain mast. The second task installs the drain mast.
TASK 38-31-21-004-001
2. Drain Mast Removal__________________
A. Consumable Materials
(1)
A00247 BMS 5-95 Class B or BMS 5-7 Class D (optional) Sealant (AMM 20-30-11/201)
(2)
A00181 BMS 5-92 Adhesive (AMM 20-30-11/201)
B. References
(1)
AMM 20-30-11/201, Adhesives, Cements, and Sealers
(2)
AMM 51-31-00/201, Seals and Sealing
C. Access
(1) Location Zone
220 Aft Cargo Compartment Equipment Bay
D. Procedure
S 024-002
(1) Remove the drain mast (Fig. 401).
(a)
Open the DRAIN MAST HEATER circuit breakers on the P18 panel and attach DO-NOT-CLOSE tags.
(b)
For the aft drain mast, do the steps that follow:
1) Remove the access panel from the aft bulkhead in the aft cargo compartment.
NOTE: Drain mast is 4-1/2 feet behind bulkhead.
____
(c)
For the forward drain mast, do the steps that follow:
1) Get access to the drain mast on the left hand air conditioning fairing panel.
(d)
Pull the insulation blanket away from the drain mast.
(e)
Loosen the clamp and disconnect the drain mast tube.
(f)
Disconnect the electrical wires at the splices.
CAUTION:_______WHEN YOU REMOVE THE FASTENERS, HOLD THE DRAIN MAST. IF THE DRAIN MAST FALLS, DAMAGE CAN OCCUR.
(g)
Remove the fasteners for the drain mast.
(h)
Remove the drain mast.
(i)
Remove and clean the aerodynamic smoother and faying surface seal (AMM 51-31-00/201).
TASK 38-31-21-404-004
3. Drain Mast Installation_______________________
A. Consumable Materials
(1) A00247 BMS 5-95 Class B or BMS 5-7 Class D (optional) Sealant (AMM 20-30-11/201)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MAST AFT DRAIN WIRES ELECTRICAL
SEE B DRAIN TUBE
CLAMP
FORWARD DRAIN MAST ASEE (4 LOCATIONS) FASTENER
ALL AROUND FILLET SEAL
TUBING MAST DRAIN HEATER WIRES DRAIN MAST MAST AFT DRAIN STRAP BONDING
SEE C
FWD
WASHER NUT AND MOUNTING B
FWD DRAIN MAST FORWARD CLAMP TUBING STRAP BONDING
A AFTER INSTALLATION SEAL EDGE ALL AROUND AERODYNAMIC SMOOTHER SURFACE FAYING SEAL SURFACE FAYING 2.55 INCHES TRIM TO
AFT DRAIN MAST C
Drain Mast and Heater Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
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