TROUBLESHOOTING GUIDE B - INSTRU-
Airspeed indicator reading remains fixed.
a. Pitot pressure line clogged with ice or debris.
Vertical velocity indicator inaccurate or inopera-
a. Static line clogged.
b. Leak in line or instrument case or loose fit-
c. Defective vertical velocity indicator.
Airspeed indicator reads incorrectly or fluctuates
a. Pitot tube or pressure line partially restrict-
ed or leaking.
b. Static port or line clogged or static line leak-
c. Faulty airspeed indicator.
Magnetic compass inaccurate, sluggish or errat-
a. Insufficient liquid.
b. External magnetic interference.
c. Defective compass.
d. Windshield heat on.
Turn-and-slip indicator inoperative or erratic.
a. Tripped turn-and-slip circuit breaker.
b. Defective turn-and-slip instrument.
Fuel quantity indicator fluctuates or reads low.
a. Defective pins in connector on harness that
mates with gage.