Continental Refrigerator IO-240-A, Installation And Operation Manual, Page: 88 / 146

4-6 IO-240 Series Engine Installation & Operation Manual
31 October 2011
Engine Operation
4-2.3.2.2. Flight Check w/Altitude Compensating Fuel Pump
3 3
Exhaust
Gas Temperature
Rise?
Less than
50°F (10°C)
IO-240-B Altitude Compensating Fuel Pump Flight Check
Ascend to a minimum of 3000 ft above airfield elevation. Adjust
aircraft attitude to maintain 2450 RPM, wide open throttle (WOT).
Retard the mixture control from Full Rich to Peak EGT while
monitoring EGT indication. Note EGT rise from Full Rich to Peak
EGT on the Engine Operational Checklist.
Greater than
250°F (121°C)
Maintenance Complete.
50°F-250°F
(10°C-121°C)?
WOT fuel pump pressure
is too low.
WOT fuel pump pressure
is too high.
Select two different additional altitudes at least 2000 ft. above the
initial test altitude. Repeat and record the leaning authority test.
NOTE:
Adjust the fuel mixture control
for Peak EGT in a slow,
deliberate movement while
monitoring the EGT indicator.
Leaning from FULL RICH EGT
to PEAK EGT requires no less
than 30 seconds. Abruptly
chopping the fuel mixture
control will yield an inaccurate
PEAK EGT indication.
Troubleshoot Fuel System
according to instructions in
Chapter 8 of the
Maintenance and Overhaul
Manual (M-6)
Perform a normal takeoff according to AFM/POH. Monitor engine
instruments; Observe operating limits in Section 2-3.
Recheck Metered
Pressure setting vs.
Figs. 6-7 or 6-8 in the
Maintenance
Manual (M-6).
Increase Metered Fuel
Pressure setting.
Less than
Maximum Limit
Reduce Metered Fuel
Pressure setting.
Greater than
Minimum Limit
Equal to or Greater than
Maximum
Metered Pressure
Limit.
Recheck Metered
Pressure setting vs.
Figs. 6-7 or 6-8 in the
Maintenance
Manual (M-6).
Equal to or Less than
Minimum
Metered Pressure
Limit.