3) Lamp Output Connections On The Tcu - Rotax 912 Series Maintenance Manual

2.1.3)
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
Lamp output connections on the TCU
The TCU is furnished with output connections for an external „red"
boost lamp and an „orange" caution lamp.
When the TCU is switched on, the two lamps are automatically
subjected to a function test. Both lamps light up for 1 to 2 seconds and
then go out.
Orange caution lamp:
All sensor inputs are monitored by the TCU via this caution lamp.
When the lamp goes out, this indicates that the TCU is ready for
operation. A lamp which flashes continuously indicates a malfunction
of the TCU or its periphery.
In the event of a malfunction, for instance if a circuit is interrupted, the
TCU switches over to pre-programmed default values to ensure engine
operation.
■ CAUTION : While the default values are effective, monitoring of the
respective channel e.g. overspeeding, is not possible.
The monitoring function is inactive.
Red boost lamp:
- Exceeding the admissible boost pressure will activate the red boost
lamp, and it will light up continuously until boost pressure falls below
the threshold.
Threshold......................... 1550 hPa (actual boost pressure)
- The TCU registers the time of full engine operation with boost
pressure. Full throttle operation for longer than 5 minutes will cause
the red warning lamp to flash.
■ CAUTION : The red boost lamp helps the pilot to avoid full power
operation with too high boost pressure for longer than
5 minutes as otherwise the engine would be thermally
overstressed.
◆ NOTE:
The time observation starts at actual boost pressure of
1250 hPa. After 5 minutes the warning is issued via the
boost lamp.
The warning is deactivated again as soon as the boost
pressure falls below 1250 hPa. If the pressure limit is
exceeded again, for example after 30 seconds, the
boost lamp lights up again.
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page 11
May 01/2007