NAVAIR 01-1A-509-3
01 March 2005
TM 1-1500-344-23-3
TO 1-1-689-3
V, Chapter 2), to both male and female sections of
connectors.
Alcohol, Isopropyl
6
(2) Wipe excess preservative with Cleaning
TT-I-735
Cloth, CCC-C-46 Class 7 (Volume IV or V, Chapter 2).
c. If no color change is observed, remove the
6-3.9. W E T - S L U G TANTALUM CAPACITORS.
indicator residue with Isopropyl Alcohol, TT-I-735
Wet-slug tantalum capacitors can be internally
(Volume IV or V, Chapter 2) and Acid Brush, A-A-289,
damaged by the application of a reverse voltage. Such
style optional (Volume IV or V, Chapter 3), or Cleaning
damage will often result in leakage of an acid which
Cloth, CCC-C-46 Class 7 (Volume IV or V, Chapter 2).
may cause corrosion in areas adjacent to the damaged
capacitor. Capacitors having evidence of leakage must
d. If color change is observed, remove damaged
be replaced and all adjacent areas cleaned to prevent
capacitor. Neutralize the contaminated area as follows:
further corrosion. The following procedures shall apply
for the inspection of wet-slug tantalum capacitors for
(1) Dissolve one cup (8 ounces) of Sodium
damage:
Bicarbonate, A-A-374 (Volume IV or V, Chapter 2), in
one gallon of fresh water. Apply solution liberally to
a. During normal equipment maintenance at the
contaminated area.
Intermediate Maintenance Activity, the seam between
the slug and case of each tantalum capacitor should
(2) Thoroughly rinse the affected area with
be examined for a small deposit of silver (the color may
distilled or deionized water. Do not allow rinse water to
be black or gray). If such color is present, place one
contaminate other areas. Cleaning Cloth, CCC-C-46
drop of the following solution on the capacitor to
Class 7 (Volume IV or V, Chapter 2), may be used to
ensure contact with the deposit and the seam between
trap rinse water runoff.
the slug and capacitor case.
(1) Dissolve 1/4 teaspoon of Indicator, Thymol
Blue Reagent, A-A-59282 (Volume IV or V, Chapter 2),
Alcohol, Isopropyl
6
in three cups (24 ounces) of deionized or distilled
TT-I-735
water.
e. C l e a n affected area by scrubbing with
Non-Abrasive Pad (Volume IV or V, Chapter 2). Rinse
with Isopropyl Alcohol, TT-I-735 (Volume IV or V,
Ammonium Hydroxide
22
Chapter 2). Wipe clean with Cleaning Cloth, CCC-C-46
A-A-59370
Class 7 (Volume IV or V, Chapter 2).
(2) Add eight drops of Ammonium Hydroxide,
f. Retest area in accordance with paragraph 6-3.9.a.
A-A-59370 (Volume IV or V, Chapter 2), to assist in
dissolving Indicator, Thymol Blue Reagent, A-A-59282.
g. If test is negative, air dry, oven dry, or dry with
hot air gun in accordance with paragraph 2-6.
NOTE
Unused Indicator, Thymol Blue Reagent,
A-A-59282, that displays a reddish-purple color
Compound, Corrosion Preventive
3
is contaminated and shall not be used. Verify
Water-Displacing
color by placing a small amount of Thymol
MIL-C-81309
Blue Reagent Indicator on white paper.
h. Preserve by applying a thin film of Water
b. If acid leakage has occurred, the solution will
Displacing Corrosive Preventive Compound, Ultra-Thin
change from an amber or blue color to a reddish-purple
Film, Avionics Grade, MIL-C-81309 Type III (Volume IV
color.
or V, Chapter 2).
6-29
