BFGoodrich PS-823 - General; Extemal Cleaning; Intemal Cleaning

BFGoodrich
Avionics Systems,
Inc.
Component
Maintenance
Manual
P/N
501-1075-()
Cleaning
1.
General
The
PS-823,
like
any
avionics equipment, will
accumulate
dust
and dirt
during
service.
BFGoodrich
Avionics
Systems, Inc. has
taken
precautions to
allow cleaning the
equipment with
environmentally
friendly solutions
and
chemicals. Procedures and
suggested
cleaning agents
are
described
in this
section.
2.
Extemal
Cleaning
CAUTION:
WATERMAY
MIGRATE
ORLEAK
INTOTHE
CELLTHROUGHTHE
CELLVENTCAUSING
A
CHEMICALCHANGEINTHECELL
RESULTING
INSHORTENED
SERVICE
LIFE,
EVENTHOUGHTHE
BATTERY
CELLSARESUPPOSEDLY
SEALED.
DONOTIMMERSE
THE
POWER
SUPPLIES
INA
WATERBATH.
The outside surfaces
and
flat
metal
parts
may
be
cleaned
with
a damp cloth
containing
a
mild
solution
of ordinary
household
cleaner
(following
manufacturer's
instructions on
cleaner
container)
and water.
Dirt and grime
caught
in metal comers or
around screws
or other
fasteners
may
be
removed
with
a modified acid
brush (bristles removed to
1/3
of the normal
length
as
shown
in
Figure 401)
and a
solution
of
cleaner and
water.
Dry
the
unit
after
cleaning
before
reinstallation
and
use.
NOTE: Water
in
connectors
can
be removed using
low pressure
compressed air.
3.
Intemal
Cleaning
WARNING: ISOPROPYLALCOHOLHAS
BEEN
IDENTIFIEDAS
HAVING
A
DEGREEOF HAZARD
INHEALTHAND
FLAMMABILITY.
CONSULT
THEAPPLICABLE
MATERIALSAFETYDATA
SHEET
PRIORTOUSE
OR
ASSOCIATIONWITHTHISPRODUCT.
With exception
to
the circuit
card assemblies (CCAs), the
internal surfaces
of the
assembly
may be
cleaned following the processes for extemal cleaning
above. CCAs
can be cleansed
using Isopropyl
Alcohol
and
a
modified acid
brush. Allow CCA to dry
prior to use.
Remove dust and dirt with
a
low-pressure
jet
of clean, dry
air.
If necessary, use the
brush depicted
in
Figure 401
to
loosen
hardened
dirt
and embedded dust
balls.
msmijtp202Cleandiskl59
24-20-03
Page 401
Revision
A
June
30, 1999