SECTION 4 LYCOMING OPERATOR’S MANUAL
PERIODIC INSPECTION O-320 SERIES
1. DAILY PRE-FLIGHT.
a. Be sure all switches are in the “Off” position.
b. Be sure magneto ground wires are connected.
c. Check oil level.
d. Be sure that fuel tanks are full.
e. Check fuel and oil connections, note minor indications for repair at 50-hour inspection. Repair any
major leaks before aircraft is flown.
f. Open the fuel drain to remove any accumulation of water and sediment.
g. Make sure all shields and cowling are in place and secure. If any are missing or damaged, repair or
replacement should be made before the aircraft is flown.
h. Check controls for general condition, travel and freedom of operation.
i. Induction system air filter should be inspected and serviced in accordance with the airframe
manufacturer’s recommendation.
2. 25-HOUR INSPECTION. After the first twenty-five hours operating time, new, rebuilt or newly
overhauled engines should undergo a 50-hour inspection including draining and renewing lubricating oil.
Engines equipped with oil pressure screen are required to comply with the following inspection after every
25 hours of operating time.
a. Lubrication System (Engines Equipped with Oil Pressure Screen) –
(1) Remove oil suction and oil pressure screens and check carefully for presence of metal particles
that are indicative of internal engine damage. Clean and reinstall the oil suction and oil pressure
screens. Drain and renew the lubricating oil.
NOTE
Change the oil at least every four (4) months even if the engine has not accumulated 25
hours since the last oil change.
3. 50-HOUR INSPECTION. In addition to the items listed for daily pre-flight inspection, the following
maintenance checks should be made after every 50 hours of operation.
a. Ignition System –
(1) If fouling of spark plugs has been apparent, rotate bottom plugs to upper position.
(2) Examine spark plug leads of cable and ceramics for corrosion and deposits. This condition is
evidence of either leaking spark plugs, improper cleaning of the spark plug walls or connector
ends. When this condition is found, clean the cable ends, spark plug walls and ceramics with a dry,
clean cloth or a clean cloth moistened with methyl-ethyl-ketone. All parts should be clean and dry
before reassembly.
4-2
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