MIL-DTL-6162 Generators And Starter-Generators, Electrical Direct Current, Nominal 30 Volts, Aircraft General Specification ForThis specification covers the general requirements for aircraft generators and starter-generators for use in 28-volt \(V\) direct current \(DC\) systems. As generators, both type machines are engine driven. The starter-generators, however, also function as engine starters when energized by electric power.

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MIL-DTL-6162C

4.5.8 Shunt field voltage. The voltage drop across the shunt field shall be measured between E (negative) and

A for long shunt field generators or between A and the negative brush for short shunt field generators.

4.5.9 Brushes (for brush type machines). Unless otherwise specified, all tests shall be performed without

replacement of brushes.

4.5.10 General instrumentation. Provisions shall be made to determine the following:

Terminal voltage

Load current

Equalizing voltage

Generator speed

Cooling inlet air temperature

Field shunt voltage

Field shunt current

Resistance in series with the shunt field

Total pressure of the inlet cooling air

Ambient air temperature

Additional instrumentation required is specified in the individual test, qualification test information, or acceptance

test information.

4.5.11 Air blast. Unless otherwise specified, blast-cooling air within � 5� C of the ambient temperature shall

be supplied to the machine in the quantity indicated in Figure 6 (see 3.4.6.1). The temperature of the air shall be

determined by means of a suitable temperature-indicating device whose responsive element is located in the cooling

air duct between the air inlet of the machine and the pressure-determining element.

4.6 Test methods.

4.6.1 Examination of product. Each machine, subassembly, and part shall be examined as the Government

Inspector may deem necessary to determine compliance with this specification with respect to material, standard

parts (see 3.3.1), simplification (see 3.4.2), mounting flange (see 3.4.5.4), QAD coupling (see 3.4.5.6),

maintainability (see 3.4.4), shaft deflection (see 3.4.5.9), cooling air screens (see 3.4.10), overhung moment (see

3.4.14), identification of product (see 3.5), installation instructions (see 3.6), safety wire and staking (see 3.8), screw

threads (see 3.9), rating charts (see 3.4.7), electrical connections (see 3.4.5.10), brushes (see 3.4.5.13),

interchangeability (see 3.4.3), rotation marking (see 3.4.15), dimensions (see 3.4.12), weight (see 3.4.13), bonding

(see 3.4.11), and workmanship (see 3.10).

4.6.1.1 Machine characteristics. The machine bonding and the cold resistance of all windings at the stabilized

ambient temperature of the machine shall be measured (see 4.6.2 and 4.6.18.3) and recorded.

4.6.2 Dielectric strength. The machine shall be run at minimum rated speed, rated voltage, and rated load until

temperature stabilization occurs. While the unit is running and with radio noise filters disconnected, the following

voltages shall be applied between windings and between each winding and frame. No sign of insulation breakdown

or arcing shall be in evidence. Following the dielectric test, the machine shall meet the requirements and initial

measurements of paragraphs 4.6.1.1 and 4.6.7.