TASK 30-00-00-040-808
16. MMEL 30-19 (DDPG) Preparation - Drain Mast Heaters Inoperative
A. General
(1) This task gives the maintenance steps which prepare the airplane for flight with the drain mast
heater inoperative.
B. Turn off water supply to associated components and deactivate inoperative drain mast
heaters
SUBTASK 30-00-00-210-008
(1) Close the associated water supply shutoff valves (lavatory, galley or fountain).
SUBTASK 30-00-00-040-002
(2) Deactivate inoperative drain mast heater(s):
(a) For an inoperative forward drain mast heater, disconnect, cap and stow wire 0243-20
from terminal block TB2201.
(b) For an inoperative aft drain mast heater, disconnect, cap and stow wire 0244-20 from
terminal block TB2201.
SUBTASK 30-00-00-865-001
(3) Alternatively, both drain mast heaters may be deactivated by opening and collaring the
following circuit breakers on the P-18 panel:
CAPT Electrical System Panel, P18-3
Row Col Number Name
E 3 C00234 HEATERS DRAIN MAST GND
E 4 C00700 HEATERS DRAIN MAST AIR
END OF TASK
TASK 30-00-00-440-808
17. MMEL 30-19 (DDPG) Restoration - Drain Mast Heater Inoperative
A. General
(1) This task puts the airplane back to its usual condition after operation with the drain mast heater
inoperative.
B. Procedure
SUBTASK 30-00-00-865-002
(1) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-3
Row Col Number Name
E 3 C00234 HEATERS DRAIN MAST GND
E 4 C00700 HEATERS DRAIN MAST AIR
SUBTASK 30-00-00-010-015
(2) Open the water supply shutoff valves.
C. Drain Mast Heater Repair
SUBTASK 30-00-00-810-008
(1) Correct the fault.
(a) Find the fault code or description of the fault that occured.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-00-00
Page 931
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
To Next Page
Loading...
