Piper Comanche PA-24 Service Manual page 809

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