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Section 2 – Product Overview
2.1 – Introduction
This manual contains the complete operating instructions and procedures for theTI47407 Micro Power Unit.
The TI47407 MPU-24 is intended to provide dc electrical ground power for aircraft flight line and maintenance
ground support operations. The unit provides 24 volt DC electrical power output for aircraft engine starting
and 24 or 28.5 volts dc electrical support for ground maintenance, avionics/electrical trouble shooting
and testing. The observance of procedures, limitations and performance criteria ensures peak operating
efficiency and maximizes operational capabilities and life of the TI47407 micro power unit.
The TI47407's high capacity power cells and circuity are encased in a rugged enclosure, and are designed
to replace the original batteries in the Bell 407 Helicopter. The internal circuitry incorporates an intelligent
recharging system that allows the MPU to rapidly recharge from either the aircraft generator or from a
standard 110 Vac or 220 Vac power source. The unit is also equipped with a built-in capacity meter that also
serves as a recharge state indicator.
Figure 2.1.1 – TI47407 MPU-24
2.2 – Indication of Terms Shall, Should and May
Within this technical manual the word "shall" is used to indicate a mandatory requirement for proper operation
and warranty purposes. The word "should" is used to indicate a non-mandatory but preferred method of
accomplishment. The word "may" is used to indicate an acceptable method of accomplishment.
TI47407 MPU-24
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