Cessna 182 1978 - Description; Flight Instrument Panel; Instruments; Pitot and Static Systems

MODEL 182 & T182 SERIES SERVICE MANUAL
information
in this section
is intended
to help the
5. To
install shock-mounted
panel, place
panel
mechanic determine
malfunctions
and correct
them,
over shock mount
studs. Be sure
the ground
strap is
up
to the defective
instrument
itself,
at which
point
installed
in the proper
position.
if removed.
then
in-
an instrument
technician should
be called in.
Some stall
nuts and washers.
instruments, such
as fuel quantity
and oil pressure
6. Install gyros,
uncap and install
plumbing. Refer
gages, are so
simple and inexpensive,
repairs usu-
to note
in paragraph 15-9.
ally
will be
more costly
than a
new instrument.
On
7. Install
decorative
cover.
the other hand, aneroid and gyro instruments usu-
ally are well worth
repairing. The words
"replace 15-6.
SHOCK-MOUNTS.
Service life of shock-
instrument" in the text,
therefore, should be
taken mounted
instruments is directly
related to adequate
only in the sense of physical replacement
in aircraft, shock-mounting of
the panel. If removel of shock-
Whether replacement is to be with a new
instrument, mounted panel is necessary,
check mounts for de-
an exchange one, or original
instrument is to be terioration
and replace as necessary.
repaired must be decided on basis of individual cir-
cumstances.
15-7.
INSTRUMENTS. (See Figure 15-1.)
15-3,
INSTRUMENT PANEL. (See Figure 15-1.)
15-8. REMOVAL. Most instruments
are secured
to the panel
with screws inserted
through the panel
15-4. DESCRIPTION.
The instrument
panel assem-
face, under the decorative
cover. To remove
an
bly consists of a stationary panel, a removable flight instrument, remove decorative cover, disconnect
instrument panel and a shock-mounted panel. The wiring or plumbing to instrument, remove mounting
stationary panel, containing fuel
and engine instru- screws and take instrument
out from behind, or in
mants is secured to the engine mount stringers and a some cases, from front of panel. Instrument clusters
forward fuselage bulkhead. The
removable panel, are installed as units
and are secured by a screw at
containing flight instruments such as airspeed, verti- each end. A cluster must be removed from panel to
cal speed
and altimiter
is secured to
the stationary
replace
an individual gage.
In all cases
when an in-
panel with screws. The shock-mounted panel, con- strument is removed, disconnected lines or wires
taining major flight instruments
such as the
horizon- should be
protected. Cap open lines
and cover pres-
tal and directional
gyros is
secured to the
removable
sure connections
on instrument
to prevent
thread
panel with rubber shock-mounted assemblies. Most damage and entrance of foreign matter. Wire ter-
of the instruments are screw mounted
on the panel. minals should be insulated
or tied up to prevent ac-
cidental
grounding
or
short-circuiting.
15-5. REMOVAL
AND INSTALLATION.
a. FLIGHT INSTRUMENT PANEL
15-9. INSTALLATION.
Generally, installation pro-
1. Unscrew threaded buttons and remove
decorative cedure is the reverse of removal
procedure. Ensure
cover.
Disconnect post light wiring if installed.
mounting screw nuts are tightened firmly,
but do not
2. Tag and disconnect plumbing and wiring. Cap over-tighten, particularly on instruments having
plumbing.
plastic cases.
The same rule applies
to connecting
3. Remove screws securing flight
instrument panel plumbing
and wiring.
to
stationary panel and pull
straight back to remove.
4. To install,
place
panel
in position
and install
NOTE
screws.
5. Install
flight instruments
in panel.
All instruments
(gages
and indicators),
re-
6.
Uncap plumbing
and connect
plumbing also
wiring.
quiring a thread
seal or lubricant,
shall be
Do
not over-tighten
connections.
Refer
to note
in
installed
using teflon
tape on
male fittings
paragraph
15-9.
only.
This tape
is available
through
the
b. SHOCK-MOUNTED
PANEL
Cessna
Supply Division.
NOTE
When
replacing
an electrical
gage
in
an instrument
cluster assembly, avoid
bending pointer or
dial plate.
Due to the
difficulty encountered
when remov-
Distortion
of
dial or back
plate could
change the
cali-
ing
the shock-mounted panel with
the gyros bration
of gages.
installed, it is
recommended that
the direc-
tional gyro
be disconnected
and
removed
prior
15-10.
PITOT
AND STATIC
SYSTEMS.
to
re -noval of the shock-mounted
panel.
15-11.
DESCRIPTION. The
pitot system conveys
1. Unscrew threaded buttons and remove decorative ram air pressure to the airspeed indicator. The
cover. Disconnect post light wiring if installed. static system vents vertical speed indicator, alti-
2. Tag, disconnect and cap gyro plumbing. meter and airspeed indicator to atmospheric pres-
3. Remove directional gyro mounting
screws and sure through plastic
tubing connected to static ports.
remove gyro from panel. A static line sump is installed at each source button
4.
Remove shock-mount.
nuts and washers then
to collect condensation
in static system.
A pitot tube
work panel out from behind flight
instrument panel. heater may be installed.
The heating element is con-
The horizon gyro may also be removed from panel trolled by a switch at the instrument panel and power-
if desired.
15-4