DA20-C1 Flight Manual
Supplement 11
Doc # DA202-C1 April 06, 2010 Page S11 - 6
6. WEIGHT AND BALANCE
The weight and balance of the aircraft is not affected by operation.
7. DESCRIPTION OF THE AIRPLANE AND ITS SYSTEMS
7.12.1. Pitot Heat
The “Pitot Heat” system consists of heating elements imbedded in the Pitot Static Probe, a 15
amp circuit breaker, a control relay, thermal limit switches (HIGH and LOW), OFF/ON switch,
and a GREEN LED monitor. The control relay closes and supplies electrical current to the Pitot
Static Probe heaters when the PITOT SWITCH is set to ON and the LOW thermal limit switch is
CLOSED. A current monitoring sensor confirms this by activating the GREEN LED monitor
light. The LOW thermal limit switch with automatic reset will cycle the control relay if the system
is ON and an overheat condition exists. If the LOW temperature limit switch activates it will
inhibit Pitot Static Probe heater operation and the GREEN LED monitor will go OFF until the
Pitot Static Probe temperature drops below approximately 50 degrees Celsius.
8. HANDLING, PREVENTATIVE AND CORRECTIVE MAINTENANCE
Revision 25 DOT Approved
To prevent premature failure of the heating elements the ground test of the pitot heat should be
kept to the minimum length of time required to verify normal operation (max. 10 seconds).
Operation of the pitot heat system on the ground is unnecessary and will shorten the life of the
heaters.
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