p/n 725.0001 REV 1.5
© 2021 TCW Technologies, LLC.
10
Instructions for Continued Airworthiness:
Electronic Ignition System Back-up
On at least an annual basis the endurance capability of the IBBS system shall be confirmed and compared
against the back-up endurance required for the connected equipment or at least 30 minutes, whichever is
greater.
As an alternate to these tests the IBBS unit may be returned to TCW Technologies for a
loaded endurance test, contact TCW for details.
Procedure for endurance testing of system providing back-up power
to electronic ignition systems
:
COMPLETE THESE STEPS IN ORDER!
Perform these tests with the aircraft properly
secured on the ground, these are not flight test procedures.
1) Start the aircraft using normal starting procedures, including turning ON the Back-up
Master switch
2) Select engine operation based on the use of only the electronic ignition module provided
with back-up battery power.
3) PULL the circuit breaker feeding pins 4,5 of the IBBS system, confirm engine continues to
run.
4) PULL the circuit breaker feeding pins 6,7,8 of the IBBS, confirm the engine continues to
run.
5) Perform the following; test A or test B:
Test A:
abbreviated battery test:
Monitor engine operation and voltmeter reading on any of pin 12,13,14,15, the back-up
power output. Confirm back-up voltage begins above 13 volts and for a period of 15
minutes remains above 12.5 volts. If these requirements are met the battery pack is
satisfactory.
Test B
: full endurance test:
Operate the engine on the electronic ignition system for the required minimum run-time
requirement (at least 30 minutes), monitor the back-up battery voltage on the voltmeter
connected to an output pin, the battery voltage must remain above 11 volts for the
duration of the test. If this requirement is met the battery pack is satisfactory.
