User manual

Part B Section 4.1.1
05 DE-ICING PROCEDURE
If icing does occur, use the following de-icing procedure
A Shift mixture control to Auto Rich
B Apply FULL CARBURETTOR HEAT HOLD fully ‘ON’ for 30 seconds.
CAUTION -If appreciable engine icing develops; the loss of power
will be accompanied by a loss of Carb heat capacity, sharply
reducing the effectiveness of full preheat in eliminating ice.
C Check whether manifold pressure is restored by slowly returning
Carb heat control toward COLD. If the increase in manifold pressure
from full hot to full cold is consistent on successive checks, the ice is
probably eliminated.
D Adjust preheat to maintain 32 degC carburetor air temperature.
When it is known that the temperature of the fuel is well below freezing which may cause
power loss due to mixture control bleeding icing:
A Adjust Carb heat control to maintain maximum permissible Carb
temperature (38degC). This type of icing may require constant
38degC heat for a considerable period of time (5 to 15 minutes or
longer) before normal operation returns. Once engine runs normally,
B Readjust preheat control to maintain 32degC carburetor air
temperature.
06 DETONATION
Detonation and Pre-Ignition are caused by:
1) Incorrect Ignition timing
2) Incorrect Grade of Fuel
3) Carbon Deposits in the Cylinder
4) Over Boosting.
The Pilot has direct control over the Boost (Manifold Pressure). It is important that the
correct settings are used at all times, and that the chart settings are adhered to.
Detonation is normally preceded by pre-ignition. Indications of both conditions are hard to
detect, but high cylinder head temperatures are good indicators that combustion is
abnormal.
Stichting Catalina PH-PBY Rev No: 00
18 May, 2004 Page: 3