SECTION 3
E
M
E
R
GENCY
PRO
CE
D
U
R
ES
PA-28-181, ARCHER ill
3.Sj Engine Roughness
Engine Roughness
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ALT AIR ........................................................................................... OPEN
If
roughness continues after one minute:
MIXTURE ............................................. Adjust for Maximum Smoothness
ALT AIR ........................... , ............................................................. CLOSE
PlJEL PUMP ........................................................ , ................................. ON
Fuel Selector .................................................................. SWITCH TANKS
Engine Indicators .......................................................................... . CHECK
LEFT/RIGHT MAG Switches ................ Individually Select OFF and ON
If operation is satisfactory on either MAG, continue on that magneto at
reduced power and full RICH mixture to nearest airport.
Prepare for power-off landing.
NOTE
If possible, always retain glide capabijjty to the
selected landing area in case of total engine failure.
Engine roughness may be caused by blockage in the injector nozzles,
induction system icing, or ignition problems.
Adjust the mixture for maximum smoothness. The engine will run
rough if the mixture is too rich or too lean. Move the alternate air to OPEN
and then turn ON the electric fuel pump. Switch the fuel selector to another
tank to see if fuel contamination is the problem.
Check the engine gauges for abnom1al readings. If any gauge readings
arc abnormal proceed accordingly.
REPORT: VB-2749
3-40
ISSUED: December 22, 2017
REVISED: July 15, 2020
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