COLD WEATHER PROTECTION
BD-100 SUPPLEMENTAL MAINTENANCE MANUAL - PART II
COLD WEATHER PROTECTION - SERVICING
SMM TASK 12-31-00-610-801
1. Configuration for Cold Weather
A. Reason for the Task
Prevent risk of damage to potable water and waste systems during any extended period of time in
freezing temperatures.
B. Reference Information
REFERENCE DESIGNATION
AMM TASK 24-00-00-861-801 Connect Electrical Power to the Aircraft
AMM TASK 24-00-00-861-802 Remove the Electrical Power from the Aircraft
AMM TASK 24-00-00-910-801 Electrical/Electronic Safety Precautions
SMM TASK 12-15-00-680-801 Draining the Potable Water System
SMM TASK 12-16-00-610-801 Servicing of the Toilet
SMM TASK 38-30-00-720-801 Functional Test of the Galley Drain
C. Tools and Equipment
REFERENCE DESIGNATION
Commercially Available Container, 5-US Gallon (19.5-Liter) or Larger
NOTE: Refer to the Illustrated Tool and Equipment Manual to make sure that you use the correct
equipment configuration.
D. Setup
(1) Obey all the electrical/electronic safety precautions (AMM TASK 24-00-00-910-801).
(2) Connect aircraft electrical power (AMM TASK 24-00-00-861-801) as required.
(3) Place containers under the drain masts as required.
EFFECTIVITY: HC206245000-SMM-2
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BD-100 SUPPLEMENTAL MAINTENANCE MANUAL - PART II
E. Procedure
CAUTION: WHENEVER THE AIRCRAFT IS TO BE PARKED OUTSIDE WITH OUTSIDE AIR
TEMPERATURES PREDICTED TO BE LESS THAN 40 °F (4 °C), THE FOLLOWING
PURGING PROCEDURE MUST BE ACCOMPLISHED TO PREVENT DAMAGE TO
SYSTEM COMPONENTS.
CAUTION: IF AN ANTIFREEZE SOLUTION IN THE SYSTEM CANNOT BE VERIFIED AND THE
AIRCRAFT CABIN WILL BE SUBJECTED TO FREEZING TEMPERATURES, THEN
THE TOILET SYSTEM MUST BE DRAINED.
NOTE: The potable water system will drain to an extent where it will not be damaged or
experience a decrease in performance should it remain installed in the aircraft in freezing
temperatures. However, upon system startup, it is possible that residual water frozen in
the system may cause a blockage of water flow. In this case, an additional delay is to be
expected until the aircraft warms up and normal flow conditions resume.
(1) Drain the potable water system (SMM TASK 12-15-00-680-801).
(2) To service the toilet, do the steps in SMM TASK 12-16-00-610-801.
(3) To drain the waste water from the galley, do the steps in SMM TASK 38-30-00-720-801.
F. Closeout
(1) Remove the electrical power from the aircraft (AMM TASK 24-00-00-861-802) as required.
(2) Remove all tools, equipment, and unwanted materials from the work area.
EFFECTIVITY: HC206245000-SMM-2
Basic Issue 12-31-00 Page 302
Feb 10/2016
12-31-00-300-V1-R2.fm
