15
•
Make certain the Button press/hold is started with the setpoint color showing (BLUE or
WHITE) (i.e. not the background GREEN color).
•
The “hold” must be uninterrupted until you reach the new engine position. If the Button hold
is relaxed in route, the setpoint will attach to an unintended release point.
Note 6: Top center and other engine position markings (TC, 20, 25, etc.) may be stamped on the
prop flange that will align with the lower engine case seam
– see engine manufacturers
documentation.
Blast Tube Cooling
E-MAGs are designed for a high-heat environment, but there are still
thermal limitations and benefits to keeping the equipment as cool as
possible. Blast tube cooling is a simple way to reduce operating
temperatures, and we consider it mandatory (not applicable to top
mounted installations on the cold side of the engine deck). Blast
tubes should be directed at the
round neck, immediately behind the
mounting flange.
The mere presence of blast-tubes does not guarantee they are
operable and/or effective. After initial operations, operators can
verify the ignitions are within temperature guidelines (under 200F
during flight). A thermal reactive label is installed on the electronics
case. Alternatively, a thermal probe can verify ignition case
temperatures at the forward section of the electronics (box shaped)
compartment.
Electrical System Condition
E-
MAG’s power dip protection helps guard against severe voltage drops that occur when the starter
motor is engaged. However, in the event of a compromised electrical system (low battery, long
cable runs, corroded terminals, cold engine, etc.) bus voltage may not rebound as the starter
speeds up (as is normal). A properly designed and functioning electrical system is essential for the
ignition to work properly. If bus voltage goes below safe levels while cranking, a built-in power dip
safety circuit will not allow the ignition to fire (per design). The starter is the largest load on the
electrical bus. Keeping non-essential loads turned OFF while cranking will help.
Note: We have no
definitive guidance, but there is some indication light-weight lithium batteries may contribute to
greater ignition voltage dips during startup.
Pull-Thru Test
The Pull-Thru test will confirm 1) plug wire assignments, 2) basic operation of firing circuits, and 3)
correct DIR as follows:
1. Remove all spark plugs from the engine and reconnect them to the plug leads.
2. *IMPORTANT* Rest each plug on the engine case or convenient location such that the
metal jacket of each plug is grounded to the engine block.
Alternatively, the plug metal
jackets can be wired to the engine block or plugs can be bundled directly to each other with
metal jackets in direct contact of each other.
Blast target
