Cessna 177 SERIES Service Manual

15-27. TROUBLE SHOOTING--GYROS. (Cont).
TROUBLE PROBABLE CAUSE REMEDY
HORIZON BAR OSCILLATES Central filter dirty. Check filter. Clean or replace
OR VIBRATES EXCESSIVELY.
filter.
Suction relief valve im- Adjust or replace relief valve.
properly adjusted.
Faulty
suction gage.
Substitute known-good
suction
gage and
check gyro indication.
Replace
suction gage.
Defective mechanism.
Substitute known-good
gyro and
check indication. Replace in-
strument.
Excessive vibration.
Check panel
shock-mounts. Re-
place defective
shock-mounts.
EXCESSIVE DRIFT IN
Central air filter dirty.
Check filter. Clean or replace
EITHER DIRECTION. filter.
Low vacuum. relief
valve Adjust or replace
relief valve.
improperly
adjusted.
Faulty suction gage. Substitute known-good suction
gage and check gyro indication.
Replace
suction gage.
Vacuum pump failure.
Check pump.
Replace pump.
Vacuum line kinked or Check lines for damage and
leaking. leaks. Repair or replace dam-
aged lines, tighten
connections.
DIAL SPINS IN ONE
Operating
limits have
been Replace
instrument.
DIRECTION CONTINU- exceeded.
OUSLY.
Defective
mechanism.
Substitute known-good
gyro
and check indication. Replace
instrument.
SHOP NOTES:
Change
2 15-13

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)