Trouble Shooting The Vertical Speed Indicator - Cessna SKYMASTER 336 1964 Service Manual

14-11. TROUBLE SHOOTING THE VERTICAL SPEED INDICATOR.
PROBABLE CAUSE ISOLATION PROCEDURE
INSTRUMENT FAILS TO OPERATE.
Static line plugged.
Defective instrument.
Substitute known-good instru-
ment and check reading.
Blow out static line per paragraph
14-14.
Replace instrument.
INCORRECT INDICATION.
Static line partially plugged.
Defective instrument.
Pointer off zero.
Alternate static source valve
open.
Substitute known-good instru-
ment and check reading.
Check visually.
Check visually.
Blow out static line per paragraph
14-14.
Replace instrument.
Reset pointer to zero.
Close for all normal operations.
POINTER OSCILLATES.
Static line partially plugged.
Defective instrument.
Leak in static line.
HAND VIBRATES.
Excessive panel vibration.
Defective instrument.
Blow out static line per paragraph
14-14.
Substitute known-good instru-
ment and check reading.
Check per paragraph 14-13.
Check panel shock mounts.
Substitute known-good instru-
ment and check reading.
Replace instrument.
Blow out static line per paragraph
14-14 and eliminate leaks.
Replace defective shock mounts.
Replace instrument.
SHOP NOTES:
14-7
REMEDY