Table 7-2. Engine Conditioning - CONT
Step 9. Engine Warmup
Warm up engine at smoothest
specified rpm, oil pressure per-
mitting. Continue warmup until
normal operating temperatures
are obtained as Indicated by
green arc on gauges.
Step 10. Power Check
Set engine at specified rpm
setting. Allow engine and instru-
ments to stabilize.
Manifold pressure readings for
different engines of the same type
and model installed on the same type
aircraft should not vary over 1 inch
Hg at a given rpm when checks are
performed at the same geographical
A higher than normal manifold pressure
indicates engine is not operating
In case of high manifold pressure, take
manifold pressure readings at several
lower rpm settings to establish rpm
manifold pressure pattern for engine. See
performance chart for rpm-manifold pres-
sure relationships for current aircraft.
Step 11. Ignition System
After completing step 10, perform
Step 12. Cruising Mixture
Set engine speed at rpm specified
In performance chart with mixture
control in AUTO-RICH position. After
engine and instruments have stabilized,
move mixture control to AUTO-LEAN
and observe rpm change. Return mix-
ture control to AUTO-RICH position.
A change of rpm, other than that allowed
in performance chart, indicates an exces-
sively rich or lean carburetor or master
control or fuel Injection lines leaking.