TM 1-1500-204-23-1
Table 7-2. Engine Conditioning - CONT
Complete
conditioning
When
Personnel
steps
Procedure
performed
responsible
Step 9. Engine Warmup
Warm up engine at smoothest
Complete
Maintenance
specified rpm, oil pressure per-
Conditioning
mitting. Continue warmup until
normal operating temperatures
Cockpit Check
Air Crew
are obtained as Indicated by
green arc on gauges.
Daily Check
Air Crew
Step 10. Power Check
Set engine at specified rpm
Complete
Maintenance
setting. Allow engine and instru-
Conditioning
ments to stabilize.
Manifold pressure readings for
Cockpit Check
Air Crew
different engines of the same type
and model installed on the same type
Daily Check
Air Crew
aircraft should not vary over 1 inch
Hg at a given rpm when checks are
performed at the same geographical
location.
A higher than normal manifold pressure
indicates engine is not operating
properly.
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
Complete
Maintenance
Check
step 17.
Conditioning
Cockpit Check
Air Crew
Daily Check
Air Crew
Step 12. Cruising Mixture
Set engine speed at rpm specified
Complete
Maintenance
Check
In performance chart with mixture
Conditioning
control in AUTO-RICH position. After
engine and instruments have stabilized,
Cockpit Check
Air Crew
move mixture control to AUTO-LEAN
and observe rpm change. Return mix-
Daily Check
Air Crew
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.
7-32
