Rockwell Commander 112 - TROUBLE SHOOTING INSTRUMENTS

ROCKWELL
COMMANDER
112/B/TC/TCA
TROUBLE
MAINTENANCE MANUAL
PROBABLE CAUSE
T ROUBLE SHOOTING THE AIRSPEED INDICATOR I
Hand fails to respond.
Incorrect indication or
hand oscillates.
Hand vibrates.
Pitot pressure connection not properly
connected to pressure line from pitot
tube.
Pitot or static lines clogged.
Leak in pitot or static line.
Defective mechanism.
Leaking diaphragm.
Excessive vibration.
Excessive tubing vibration.
TROUBLE SHOOTING THE VERTICAL SPEED INDICATOR I
Instrument fails to operate. Static line plugged.
Static line broken.
Incorrecy indication.
Partially plugged static line.
Ruptured diaphragm.
Pointer off zero.
Pointer oscillates.
Partially plugged static line.
Leak in static line.
Leak in instrument case.
REMEDY
SECTION VIII
INSTRUMENTS
Test line and connection for leaks.
Repair or replace damaged line,
tighten connections.
Check line for obstructions. Blow
out
lines.
Test lines and connections for
leaks. Repair or replace damaged
lines, tighten connections.
Substitute known-good instrument
and check reading. Replace instru-
ment.
Substitute known-good instrument
and check reading. Replace instru-
ment.
Check instrument mounting screws.
Tighten mounting screws.
Check clamps and line connections
for security. Tighten clamps and
connections.
Check line for obstructions. Check
static source. Blowout lines.
Clean static source.
Check line for damage, connections
for security. Repair or replace
damaged line, tighten connections.
Check line for obstructions. Check
static source. Blowout lines.
Clean static source.
Substitute known-good indicator and
check reading. Replace instrument.
Reset painter to zero.
Check line for obstructions. Check
static source. Blowout lines.
Clean static source.
Test lines and connections for leaks.
Repair or replace damaged lines,
tighten connections.
Substitute known-good indicator and
check reading. Replace instrument.
figure 8-6. Trouble Shooting Instruments and Vacuum System (Sheet 1 of 7)
8-15
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**