Rate Of Climb Indicator Troubleshooting; Sensitive Altimeter - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
TABLE XI-IV. RATE Of CLIMB INDICATOR
Trouble
Cautc Rcmedy
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Pointer don not set on Alin, of diaphrapn. Reset pointer to zero by
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zero.
ma.ns of setting screw.
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Tap instrument while
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resettint·
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Pointt!' fails to respond.
Obstruction in scatic line.
Disconnect all mstNlTtmu
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connected to the statit
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line.
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Chetk individual inm't.lments
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I for cbsrructicn In lines.
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POinter osculates.
Leaks in !tatit lines. Disconnect aU instruments
connected to the static
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line. Chetk individual
instruments for leaks.
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!lecoMeCt instrUments
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to static line and test
installation for leaks.
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Defective mechanism.
Replace inStrument. I
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11-3... Sensitive Altimeter.
11-35. General. The :l.ltimeter indicates pressure altitude in feet above sea level. The indicator has three
pointers and dial scale. The long pomter is read in hundreds of feet_ The middle pointer is read in thousand
of feet and the short pointer in ten thousand feet. A field ?ressure window is located (In the rig!'lt Side of
the indicator dial and is set bv the knob located on the lowt!' left eeener of the instrument. The altimeter
consrsts of a sealed diaphragm that is connected to the pointers through a mechanical linkage. The
insrrumene case is vented to the static air system and as sutic air pressure decreases, the dia:lhragm
expands. causing the pointers to move through the mechanicallinkaae.
11-36. Removal And Replacement. Refer to Paragraph 11-18 of this section.
11-3';' Troublcshooan!.
INSTRUMENTS
ISSUED: 8/18/72
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