PIPER
COMANCHE
SERVICE
MANUAL
11·24
Removal And ReplaccmcnL Refer to
Parqnph
11-15
of
this secnon.
11·25
Troublcshooanl.
TABLE XI·II. DIIlECTlONAL GYRO INDICATOR
Trouble
Ca_
Remedy
Exc
...
drift in
either
Excessive vibn.rion with Check shock mounts.
direction.
ampliNde
more
than
0.006
inch.
Insufficient vacuum. If
vacuum below
4.2
inch
hi
..
check for
the
followins'
a. Relief valve improperly
1.
Adjust.
adjusted.
b.
Incorrect
puge
rudins.
b. RecaJibrate.
c. Pump fa.ilure.
c. Repair
or
replace.
d.
Vacuum line kinked
or
d. Check and
repa".
leaking. Check for collapsed
i.nner
w&ll
of
hose
Defective
insavment.
Replace instrUment.
Dial
Spins
continuously. Defective mechanism.
RCJ>lacc.
11-26
Gyro
Horizon.
11·27 GenenJ.
The
IYro horizon
is
essentially an air driven gyroscope rota
tin!
in 1 honzonta! plane and
is
oper.ned bv the same
prinCipal
as
the
dlr'cctional gyro. Duc
to
the
gyroKOPIC
incma. the spm
L,,(LS
continues
[0
point
in
the
vertical direction. providing a
constant
visual reference
[0
the
atntudc
of
the
airplane relative
to
pitc:h and roll
uis.
A
bu
Kross
me
face
of
the
indicator represents the horizon. A
mmiature adjustable airplane
is
mounted
to the
cue
and
aligning the miniature airplane
to
the
norilon
bar
simulates
the
alignment
of
the airpl&nc
to
the actUal horizon. Any deviation simulates the dC\'ianon
of
the
airplane from
thC'
truC'
horizon. The gyro norizon
is
marked for different degrees
of
bank
11-28 Removal
And
Replac:cmenL Refer to Paragraph 11-18
of
this section.
INSTRUMENTS
ISSUED:
8/18/72
3
G6
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