PIPER
COMANCHE
SERVICE
MANUAL
TABLE XI-IV. RATE OF
CLIMB
INDICATOR
Trouble
c.u..
Remedy
I .
I POlmer does noc set
on
Aging
of
diaphragm. Reset pointer to zero bv
zero
means
of
setting
screw.
Tap
Instrument while
resetting
I
Po""er
fails
'0
'''pond.
Obsrruction
in static hne. D1scOnnect all mstTUmems
connected to the su.ric
line.
I
Check indh,idual instrUmentS
I
for obstrUction
In
Iincs.
I
Pointer oscillates Leaks
in
scuic
lines. Disconnect
ill
inStrUments
conneaed
[0
the
stuic
line. Check individual
instrUments for teaks.
Reconnect
instrUmentS
to
suric
line
lDd
test
insullation
for leaks.
I
Defective mechanISm. Replace instrument
II·3-\. Scnsiri\lc
AJrimcm.
11·]5
General. The altimeter indicates pressure altitude
in
feet above sea level.
T:-'c
mdica.tor has three
pOinten and
dial scale. The long !'olnter
is
read
in
hundreds of feet. The middle pointer
is
read
In
thousand
of
feet and
the
short
pOinter in ten
thousand
tecto
:\
field !,fessure window
1S
located on
the
rilJht
Side
of
the mdicator dial and
is
set bv the
knob
located
on
the lower left
comer
of
the instnlment. The
lirimeter
consists
of
a scaled diaphragm that
is
connected
to the p01nten through a mechanical linkage. The
instrument
case
IS
vented to the static air system and u static
all'
pressure
decrcucs.
t~e
di:l~hrllJm
C'~pa.nds.
causing
the
pointers to move through
the
mechanical linkage.
11·36. Removal And Replacement. Refe:-
co
Paragraph 11·18
of
this section.
11-
J 7 Troubleshooting.
INSTRUMENTS
ISSUED:
8118/72
3
G8
I
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