Unscheduled Corrective Maintenance; Lightning Strike - After A Lightning Strike; Engine Overspeed - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

05-50 - UNSCHEDULED CORRECTIVE MAINTENANCE

1. Unscheduled corrective maintenance is necessary when any of the following conditions occur:
A. Lightning Strike
B. Engine Overspeed
C. Engine Overboost
D. Incorrect Fuel or
Fuel Contamination
E. Soaked Engine
A. Lightning Strike - After a lightning strike:
After a lightning strike, if there is external evidence of electrical damage to the engine or
propeller or evidence of magnetism of the engine or propeller, before the next flight, complete a
visual inspection of the engine and propeller for electrical arc damage (in accordance with the
airframe and propeller manufacturer's recommended procedures/guidance).
If there is evidence of arc damage, send the engine either to Lycoming Engines or an FAA
authorized repair facility for an internal inspection and evaluation on whether an engine repair or
overhaul is necessary.
OR
Complete the following in the field in accordance with the applicable Lycoming Engines'
manual:
(1) Remove, disassemble, and clean the engine (per Chapters 72-00, 72-05, 72-20, and 05-30).
(2) Examine the engine compartment in the aircraft, the engine, external surfaces, internal
parts for discoloration, cracks, and other indications of arcing and heat damage.
NOTICE: Refer to the latest revision of Service Bulletin No. 240 which identifies certain
parts that must be replaced on engine reassembly. Do not re-install any part if
it is discolored, cracked, or damaged. Replace the part with a serviceable
part.
(3) Visually examine all wiring and electrical components for:
(a) Heat damage to the harness braiding and on the engine in galleys and behind panel
lights
(b) Burnt wire, cracked insulation, evidence of arcing
(c) Evidence of arcing or heat damage to the harness connector and airframe receptacles
for the aircraft interface
(d) Evidence of arcing or heat damage to the engine harness ground terminals
(4) Review the fault codes recorded after the lightning strike for an indication of sensors
affected by the lightning strike.
(5) Replace all affected wiring, sensors, and electrical components.
(6) Assemble the engine and complete an Operational Ground Check, per the applicable
Lycoming manual or the aircraft manufacturer's Pilot's Operating Handbook (POH), to
ensure the engine is operating correctly.
© 2018 Avco Corporation. All Rights Reserved
November 2018
F. Engine on Fire or
Near Fire
G. Hydraulic Lock
H. Volcanic
Ash/Particulate
Contamination
I. Valve Sticking
J. Oil Starvation/Sudden Loss of Oil Pressure
K. Metal Contamination of the Lubrication
System
L. NTO & TLO Illumination on the Control
Panel
M. Propeller Strike, Sudden Engine Stoppage,
or Loss of Propeller Blade Tip
05-50
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