NOTE:Make an analysis of your airplane's environment, the inhibitor used, and
the application schedule to be sure of sufficient corrosion protection.
Other water displacing corrosion inhibiting compounds could be satisfac-tory. BMS 3-29 is being introduced into Boeing production lines as shown.
Model Line No. Ref. Service Letter
757 493 757-SL-20-21
767 480 767-SL-20-21
For standardization, operators are encouraged to evaluate using BMS 3-29
as a replacement for both BMS 3-23 and the "dual coat" consisting of BMS 3-23 and BMS 3-26. However, BMS 3-23 and BMS 3-26 are still acceptable. Also,
refer to the discussion of a new heavy duty CIC BMS 3-35 (paragraph 4.E.).
B. BMS 3-23 Water Displacing Corrosion Inhibiting Compound
(1) General
(a)
This is an organic compound of nonvolatile base materials in sol-vents to make a fluid. It does not contain silicones. Dipping,
brushing, or spraying can apply this compound. The liquid carrier
evaporates quickly to put a thin layer of wax-like material on the
surface. The coating is not easily rubbed or worn off, but must be
applied again if the surface is washed frequently.
(b)
BMS 3-23 compound stays tacky and thus will collect unwanted mate-rial. The areas where it is applied must be regularly cleaned and
then more of the corrosion inhibitor must be applied. The time
between applications of the compound will change with the location
in the airplane. Refer to the Maintenance Planning Document for
details.2) Types of BMS 3-23 are listed below.
1) Type I -A transparent colorless film which is detectable only with
ultraviolet light.
2) Type II -A colored film which is readily detected by the unaided
eye.
Volume 1
20-60-00
Page 2
OCT 01/02
CORROSION PREVENTION MANUAL
GENERAL INFORMATION
STANDARD PREVENTIVE MAINTENANCE PROCEDURES
(2) Materials qualified under BMS 3-23:
Type Material Vendor
Boeshield T-9 (colorless) Gibson Chemicals, Ltd.,VZ0033
I
Boeshield T-9HF (color-Oxy Metal Industries, V45738
less)
II Boeshield T-9 (colored) Gibson Chemicals, Ltd.,VZ0033
Boeshield T-9HF colored) Oxy Metal Industries, V45738
LPS-3 Holt Lloyd Corp., V66724
Dinitrol AV8 (Replaces Dinol International, VOL040
AV5B-2)
(3) Precautions for Use of BMS 3-23
WARNING: THESE COMPOUNDS ARE APPROXIMATELY EQUAL TO KEROSENE OR ALI-PHATIC NAPHTHA IN TOXICITY. TO PROTECT SKIN, USE SAME PRECAU-TIONS AS FOR KEROSENE. WHEN YOU SPRAY THEM IN AN ENCLOSED AREA,
SUCH AS LOWER FUSELAGE, A VAPOR CONCENTRATION OF 500 PARTS PER
MILLION IS THE MAXIMUM COMFORTABLE WORKING LIMIT. AT THIS CON-CENTRATION A MAN CAN WORK AN 8-HOUR SHIFT. VAPOR LEVELS EXCEED-ING 500 PPM ARE NOT DIRECTLY TOXIC, BUT FORCED VENTILATION MAY
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