TO 1-1-700 - Robins Air Force Base

TO 1-1-700
a. After first directing blast of air at floor to clear any
condensed moisture from the air line, blow air over all
surfaces or use a commercial grade wet/dry vacuum to
remove all loose dirt, dust, and abrasive debris.
6.4.1.5 Screw threads and screw adjustments, normally
moved in process of operation or adjustments.
6.4.1.6 Springs, except at base of pile up.
6.4.1.7 Surfaces whose operating temperatures exceed
302 °F (150 °C) or will cause carbonization or smoking.
TT-N-95, NAPHTHA, ALIPHATIC 66
6.4.1.8 Transparent plastic parts.
6.4.1.9 Windows, lenses, etc.
6.4.1.10 Cable with plastic or rubber insulation.
TT-I-735, ALCOHOL, ISOPROPYL 65
b. Clean any oil, grease, or residual treatment from the
metal parts by wiping with a soft cloth wet with a 50/50
by volume mixture of TT-N-95 Aliphatic Naphtha and
TT-I-735 Isopropyl Alcohol, and dry them by wiping
with a clean, dry cloth.
c. Clean any remaining visible resin deposits from areas
where soldering operations will be conducted by scraping
or chipping.
6.4 PREPARATION FOR RETREATMENT.
After all repairs and refinishing in accordance with Chapters 7
and 8 of this manual and TOs 1-1-8, 1-1-689-series, 1-1-691
31-1-69, 31-1-75, 35E4-1-162, and all applicable equipment
system specific maintenance manuals have been completed,
reassemble equipment as far as practicable while still allowing
complete coverage of required areas. Sometimes, it is better to
coat subassemblies with varnish prior to assembly to provide
better coverage and/or aid in application.
6.4.1 Masking. Mask all surfaces or parts where such application
of the varnish coating will interfere with operation or
performance of equipment. The following are examples of surfaces
which are NOT to be treated by the method specified
herein:
6.4.1.1 Contact portion of binding posts, connectors, fuses,
jacks, keys, plugs, relay, sockets, switches, test points, and
variable capacitors.
6.4.1.2 Surfaces which rub together for electrical or magnetic
contact such as those in contact fingers, potentiometers, shafts,
shields, variable autotransformers, and relays.
6.4.1.3 Bearing surfaces, including bearing surfaces of gaskets
and sliding surfaces.
6.4.1.4 Bearings, gear teeth, and gear trains of assemblies.
6.4.1.11 Capacitors - variable, air, ceramic, or micadielectric
types.
6.4.1.12 Ceramic insulators subject to 600 V operating voltage,
where danger of flashover exists.
6.4.1.13 Materials when used for their specific ARC-RESIS-
TANT properties and classified as ARC-RESISTANT in applicable
material specifications.
6.4.1.14 Painted, lacquered, or varnished exterior surfaces.
6.4.1.15 Pins, mating surfaces, and threads of plugs, plugconnectors,
tube sockets, etc.
6.4.1.16 Resistors where heat dissipation is undesirably
affected and where coating material may become carbonized.
6.4.1.17 Rotating equipments, dynamotors, generators,
motors, etc., however, their associated electronic components
such as filter units, etc., shall be treated according to requirements
specified herein.
6.4.1.18 Wave guides and R.F. plumbing, in particular on
mating flange areas, where the varnish coating may be detrimental
to proper functioning, cause an improper VSWR to
develop, and/or attenuate signals to a greater than allowable
degree.
6.4.1.19 The exterior, visible outside portions of indicating
instruments and control boxes.
6.4.2 Drying of Equipment. Apply the varnish coating only
on dry surfaces and never on wet or damp surfaces. Dry equipment
by heating it to 120 °F to 140 °F (49 °C to 60 °C) for a
minimum period of 1/2 hour but no longer than 3 hours to
substantially dehydrate equipment, and allow it to cool below
100 °F (38 °C) prior to varnish coating application.
6.4.3 Methods of Treatment. Use the following techniques
and criteria for application of the varnish coating:
6-5