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Warning Indication Annunciators
The EECS has a simple set of hardwired warning annunciators (shown in Figure 1 and identified in
Table 2 along with pilot action), to supply critical system status data to the pilot. These annunciators
are connected directly to the ECU. The annunciators will still operate if airframe power is lost.
NOTICE: During routine maintenance, such as a scheduled oil change, the service technician can
display the ECU fault codes (Appendix D in the TEO-540-A1A Engine Maintenance
Manual) using the FST on an attached laptop. If any fault is present, the service
technician must take action to correct the fault.
Annunciator
Annunciator Name
Acronym
NTO Pri
No Take-Off
NTO Sec
Time-Limited
TLO
Operation
FFL
Fault Found
PFT
Pre-Flight Test
Pilot Controls and Annunciators
Page 20
TEO-540-A1A Engine Installation and Operation Manual
Table 2
Indicator Annunciators
Definition and Pilot Action
If the NTO annunciator is constantly illuminated before,
during, or after completing the Pre-Flight Test, while the
aircraft is on the ground, do not take-off. Identify the
fault(s) using the FST, correct the condition(s), and clear
the fault(s).
If the NTO annunciator illuminates during flight and
stays illuminated constantly, land as soon as safely
possible. Although, the engine will continue to operate,
operation will be in a degraded mode which requires a
prompt, safe landing. Identify the fault(s) using the FST,
correct the condition(s), and clear the fault(s) before
further flight.
If the TLO annunciator illuminates, it is still safe for
flight if flight is necessary. However, it is recommended
the fault(s) is identified using the FST, the condition(s)
corrected, and the fault(s) cleared. If service is not done
within 20 hours, the NTO annunciator will illuminate.
If the FFL annunciator illuminates, a minor fault, which
does not have an effect on engine operation has occurred.
No pilot action is necessary. However, this fault must be
corrected at the next service interval.
If this annunciator is illuminated, the pre-flight test is in
progress. Do not move the power control until the
annunciator has turned off. If the pre-flight test sequence
is stopped before it is completed, the PFT annunciator
will flash. Momentarily press the PFT button. Complete
another pre-flight test per instructions in this chapter.
© 2018 Avco Corporation. All Rights Reserved
October 2018
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