TROUBLESHOOTING GUIDE B - INSTRUMENTS
Airspeed indicator reading remains fixed.
Pitot pressure line clogged with ice or debris.
Vertical velocity indicator inaccurate or inoperative.
Static line clogged.
Leak in line or instrument case or loose fittings.
Defective vertical velocity indicator.
Airspeed indicator reads incorrectly or fluctuates excessively.
Pitot tube or pressure line partially restricted or leaking.
Static port or line clogged or static line leaking.
Faulty airspeed indicator.
Magnetic compass inaccurate, sluggish or erratic.
Windshield heat on.
External magnetic interference.
Turn-and-slip indicator inoperative or erratic.
Tripped turn-and-slip circuit breaker.
Defective turn-and-slip instrument.
Fuel quantity indicator fluctuates or reads low.
Defective pins in connector on harness that mates with gauge.