Piper COMANCHE PA-24-180 Service Manual page 670

Trouble
Excessive scale error.
Excesive pointer
osrilranon.
Caue
High reading.
Dull or discolored
luminous markings.
Barometric scale and
reference markers out
of vsnchronism.
Buromemc scale and
reference markers out
of synchronism with
pointers.
PIPER COMANCHE SERVICE MANUAL
TABLE XI-V. ALTIMETER
0
Improper
menr.
calibration adjust-
Remedy
Replace instrumenr.
Replace insrument
Defective mechanism.
improper venang. Eliminate leak in staic
pressure system and check
alignment of airspeed cube
SeTting knob is hard to
turn.
Inner reference marker
fails co move when
setting knob is rotated.
Wrong lubncaion or lack
of lubrication.
Out of engagement.
Rr '.ce instrument.
Replace instrument.
Setting knob ser screw
loose or msinmg
Exce
Exci
Age
ssive
vibration.
Tighten mstrument screw.
if loose. Replace in-
strument. if screw is
missing.
Cracked
glass.
or loose cover ssive vbration
Replace instrument.
Slippage of manng parts.
Dnft in mechanism.
Replace instrument.
Replace instrument.
Reset pointers. refer to the
latest revision of AC 43 13-1
REVISED: 4/10/81
INSTRUMENTS
0
3 G9