Propeller Strike, Sudden Engine Stoppage Or Loss Of A Propeller Blade Tip - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
(2) The Time-Limited Operation (TLO) lamp is connected through a single channel of the
ECU. However, either ECU channel can turn on this signal independent of the other if
both channels are functioning correctly. The TLO lamp illuminates if there is a condition
that causes a Time Limited Operation or TLO. If the engine is operated for more than 20
hours with a TLO fault, that has not been corrected and cleared, the NTO lamp will
illuminate.
(3) The Fault Found Lamp (FFL), if applicable, connects to the ECU through a single
channel. However, either channel can turn on the signal independent of the other if both
channels are operating correctly. The FFL lamp illuminates when a fault, which has no
safety effect on the EECS, is detected. The fault must be corrected at the next routine
service interval. This lamp could be out of view by the pilot and visible only to
Maintenance personnel.
M. Propeller Strike, Sudden Engine Stoppage or Loss of a Propeller Blade Tip
(1) This section includes recommendations for aircraft engines that have had propeller/rotor
damage as well as any of the following.
• Separation of the propeller/rotor blade from the hub
• Loss of a propeller or rotor blade tip
• Sudden stoppage
• Any incident, whether or not the engine is operating, where repair of the propeller is
necessary
• Any incident during engine operation where the propeller has impact on a solid object
which causes a decrease in rpm and where a structural repair of the propeller is
necessary. This incident includes propeller strikes against the ground. Although the
propeller can continue to turn, damage to the engine can occur, possibly with
progression to engine failure.
• Sudden rpm drop on impact to water, tall grass, or similar yielding medium where
propeller damage does not usually occur.
(2) A propeller strike can occur at taxi speeds and during touch and go operations with
propeller tip ground contact. In addition, propeller strikes also include situations where an
aircraft is stationary and a landing gear collapse occurs causing one or more blades to be
bent, or where a hangar door (or other object) hits the propeller blade. These instances are
cases of sudden engine stoppage because of potentially severe side loading on the
crankshaft propeller flange, front bearing, and seal.
(3) Recommended Corrective Action for Propeller Strikes
CAUTION
© 2018 Avco Corporation. All Rights Reserved
November 2018
BASED UPON THE ACCUMULATED ENGINEERING, TECHNICAL
AND HISTORICAL DATA AVAILABLE, LYCOMING ENGINES
PROHIBITS STRAIGHTENING OR GRINDING OF BENT
CRANKSHAFT PROPELLER FLANGES TO RESTORE MAXIMUM
RUN-OUT SPECIFICATION AS NOTED IN THE LATEST REVISION
OF THE SERVICE TABLE OF LIMITS - SSP-1776. IF THE
CRANKSHAFT PROPELLER FLANGE IS BENT, REPLACE THE
CRANKSHAFT. DO NOT TRY TO STRAIGHTEN OR GRIND THE
CRANKSHAFT PROPELLER FLANGE. REFER TO THE LATEST
REVISION OF SERVICE BULLETIN NO. 201.
05-50
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