If the engine is still rough, adjust the mixture for maximum smoothness.
The engine will run rough if too rich or too lean. The electric fuel pump
should be switched to ON and the fuel selector switched to the other tank to
see if fuel contamination is the problem. Check the engine gauges for
abnormal readings. If any gauge readings are abnormal, proceed accordingly.
Move the magneto switch to L then to R. then back to BOTH.
If operation is satisfactory on either magneto, proceed on that magneto at
reduced power, with mixture full RICH, to a landing at the first available
airport.
If roughness persists, prepare for a precautionary landing at pilot’s
discretion .
NOTE
Partial carburetor heat may be worse than no
heat at all, since it may melt part of the ice,
which will refreeze in the intake system. When
using carburetor heat, therefore, always use full
heat, and when ice is removed return the
control to the full cold position.
3.25 LOSS OF PITOT-STATIC PRESSURE
If loss of either pitot or static pressure or both occurs, the alternate
source must be used. The control lever located under the left side of the
control quadrant should be pushed forward to the open position.
Operation on an alternate static source will cause deviations in the
altimeter, rate of climb indicator and airspeed indicator readings. See the
correction card mounted on the left side of the control quadrant cover for
deviations.
If the problem is in the pitot head or pitot line and is caused by icing or
heavy rain conditions, the optional pitot heat may be activated if it is
installed. The switch for the heated pitot is located on the electrical switch
panel to the left of the control panel. A partially or completely blocked pitot
head will give erratic or zero readings on the airspeed indicator.
SECTION 3
PIPER AIRCRAFT CORPORATION
EMERGENCY PROCEDURES
PA-38-112, TOMAHAWK
REPORT: 2126
ISSUED: JANUARY 20, 1978
3-14
REVISED: DECEMBER 6, 1979
If the engine is still rough, adjust the mixture for maximum smoothness.
The engine will run rough if too rich or too lean. The electric fuel pump
should be switched to ON and the fuel selector switched to the other tank to
see if fuel contamination is the problem. Check the engine gauges for
abnormal readings. If any gauge readings are abnormal, proceed accordingly.
Move the magneto switch to L then to R. then back to BOTH.
If operation is satisfactory on either magneto, proceed on that magneto at
reduced power, with mixture full RICH, to a landing at the first available
airport.
If roughness persists, prepare for a precautionary landing at pilot’s
discretion .
NOTE
Partial carburetor heat may be worse than no
heat at all, since it may melt part of the ice,
which will refreeze in the intake system. When
using carburetor heat, therefore, always use full
heat, and when ice is removed return the
control to the full cold position.
3.25 LOSS OF PITOT-STATIC PRESSURE
If loss of either pitot or static pressure or both occurs, the alternate
source must be used. The control lever located under the left side of the
control quadrant should be pushed forward to the open position.
Operation on an alternate static source will cause deviations in the
altimeter, rate of climb indicator and airspeed indicator readings. See the
correction card mounted on the left side of the control quadrant cover for
deviations.
If the problem is in the pitot head or pitot line and is caused by icing or
heavy rain conditions, the optional pitot heat may be activated if it is
installed. The switch for the heated pitot is located on the electrical switch
panel to the left of the control panel. A partially or completely blocked pitot
head will give erratic or zero readings on the airspeed indicator.
SECTION 3
PIPER AIRCRAFT CORPORATION
EMERGENCY PROCEDURES
PA-38-112, TOMAHAWK
REPORT: 2126
ISSUED: JANUARY 20, 1978
3-14
REVISED: DECEMBER 6, 1979