Metal Contamination Of The Lubrication System; Nto & Tlo Illumination On The Control Panel - Lycoming TEO-540-C1A Maintenance Manual

(4) Any time oil pressure falls below the minimum level, refer to the latest revision of
Service Bulletin No. SB-399, identify the root cause as per the following protocol of
progressive steps:
(a) Complete the "Oil Level Check" in the oil sump (per Chapter 12-10). If no oil is
visible on the oil level gage (dipstick), drain and collect the oil and measure the oil
quantity.
(b) If the oil level is sufficient, complete the check of the oil pressure indication system
accuracy. If the oil pressure gage is not operating correctly, replace it.
(c) Examine oil line connections for leaks. Tighten any loose connections per the torque
values in the latest revision of the Service Table of Limits - SSP-1776 and look for
leaks. Replace leaking oil hoses per Chapter 72-50.
(d) Per Chapter 12-10, complete the "Oil Suction Screen Removal/Inspection/
Cleaning/Installation" at the oil sump and the "Oil Filter Inspection." Look for
blockage or metal deposits. If metal or blockage is found, remove the material and
identify the origin of material and correct the root cause.
(e) Examine the oil pump for malfunction. Replace the oil pump if it is not operating
correctly. Refer to Chapter 72-25.
(f) If the oil pressure indication system is operating correctly and there has been
confirmation that oil pressure loss/oil starvation has occurred, contact Lycoming
Engines' Technical Support.
K. Metal Contamination of the Lubrication System
(1) If metallic particles/residue, metal shavings or metal flakes is found in the engine oil after
oil servicing, refer to the "Identification of Metallic Solids After Oil Servicing" section in
Chapter 12-10 and complete the recommended corrective action.
NOTICE: Do not disassemble the PMA, if metal contamination is found replace the PMA.
(2) If magnetic particles/residue, shavings, or flakes are identified, remove and examine the
Permanent Magnet Alternator (PMA) for possible ferrous metal contamination.
L. NTO & TLO Illumination on the Control Panel
NOTICE: When the ignition is turned ON, each control channel will illuminate all warning
lamps simultaneously to complete a bulb check.
(1) The No Take-Off (NTO) signals are connected by wire to each channel of the ECU.
There is a separate lamp for each ECU channel. The wires for those signals connect
through separate connectors on the ECU. Either channel of the ECU can turn on its NTO
signal independent of the other channel. However, if inter-channel communications are
operating correctly, both channels will turn on their NTO signals if either channel senses
an NTO fault. The NTO lamp illuminates when a serious fault has been detected by the
ECU. A serious fault causes degradation of the safety margins of the ECU even though
the engine appears to be operating correctly.
05-50
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TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
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November 2018