A. Because of the urgency involved in removing mercury from the airplane, most
of these procedures utilize materials that are readily available locally.
However, the use of some special equipment is beneficial in ensuring that
all traces of mercury are removed, and the sources of supply for these items
are as follows:
(1)Hg vacuum cleaner: Nilfisk of America Inc. (V57573).
(2)Sensing device (mercury sniffer): Beckman Industrial Corp. (V73138), or
Sunshine Scientific Instruments Inc. (V06030).
(3)Nickel-plated carbon-fiber brushes: International Research and Develop-ment Co.
(4)Mercury sponge: J.T. Baker Chemical Co. (V70829).
Volume 1
20-41-00
Page 3 OCT 01/01
CORROSION PREVENTION MANUAL
CORROSION REMOVAL TECHNIQUES
PROCEDURE AFTER MERCURY SPILLAGE
NOTE: MERCURY VAPOR MAY CONTAMINATE THE VACUUM CLEANER.
CLEAN THOROUGHLY AFTER USE.
Vacuum Cleaner Mercury Trap
Figure 1
Volume 1
20-41-00
Page 4
OCT 01/01
CORROSION PREVENTION MANUAL
GENERAL INFORMATION CORROSION REMOVAL TECHNIQUES
PROCEDURE AFTER FIRE DAMAGE
1. +General
A. Service experience has indicated that corrosion problems can occur if fire
damaged areas are not immediately cleaned. The sooty deposits resulting from
burning organic materials and the residue from the use of dry powder type
fire extinguishers are the sources of contaminants that may initiate corro-sion in metal systems and structure.
B. The dry powder type fire extinguishers are considered very effective in com-batting airplane fires. The powder from extinguishers of this type is decom-posed by heat to form carbon dioxide. The residual deposit, however, is
hygroscopic and forms sodium hydroxide when moisture is absorbed from the
air or mixed with water from airplane flushing. Sodium hydroxide is alkaline
and can cause corrosion damage to aluminum structure, electrical compo-nents, etc. Use large quantities of water for flushing in every compartment,
crevice and corner, and behind electrical panels to eliminate all traces of
this rather insoluble white powder.
C. BCF and similar halogen type fire extinguishers normally leave no chemical
residue to corrode parts or surfaces. However, when subjected to flame or
hot surfaces, halogenated agents can decompose to produce small amounts of
halogen acids.
2. Preventive Maintenance
A. Remove fire damaged interiors to expose structure. This includes interior
trim, seats, passenger service units, linings, insulations, galleys, etc.
Removal of tubing, cables, electrical wiring, etc., is not necessary if they
are unaffected.
B. Screen or mask off areas not affected.
C. Open all drains, hatches and doors for drainage and ventilation. Use com-pressed air to blow dry all hidden recesses. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 防腐手册 CORROSION PREVENTION MANUAL 第二册 一般信息(36)
