MIL-PRF-21480B
CONTENTS
PARAGRAPH
PAGE
4.4.9
Generator package input shaft speed .................................................................... 21
4.4.10
Environmental test methods.................................................................................. 21
4.4.11
Electrical performance verification....................................................................... 21
4.5
Methods of inspection........................................................................................... 21
4.5.1
Examination of product......................................................................................... 21
4.5.2
Maximum speed for regulation ............................................................................. 22
4.5.3
Electrical performance .......................................................................................... 22
4.5.3.1
Electrical performance at standard temperature ................................................... 22
4.5.3.2
Electrical performance at minimum temperature ................................................. 23
4.5.3.3
Electrical performance at maximum temperature ................................................. 24
4.5.3.4
Electrical performance for conformance inspection ............................................. 25
4.5.4
Overspeed ............................................................................................................. 26
4.5.5
Dielectric strength ................................................................................................. 26
4.5.5.1
Qualification and conformance inspection ........................................................... 26
4.5.5.2
Production lot inspection (manufacturer only) ..................................................... 26
4.5.6
Load and speed transients ..................................................................................... 26
4.5.7
Voltage ripple and distortion (DC power source) ................................................. 26
4.5.8
Phase balance ........................................................................................................ 27
4.5.9
Efficiency (heat rejection)..................................................................................... 27
4.5.10
Short circuit capacity (AC and DC) ...................................................................... 27
4.5.11
Output AC voltage modulation ............................................................................. 27
4.5.12
Electromagnetic emissions and susceptibility ...................................................... 27
4.5.13
Voltage waveform distortion ................................................................................ 28
4.5.14
Temperature altitude ............................................................................................. 28
4.5.15
Operating position................................................................................................. 28
4.5.16
Switch operation (control and reset functions) ..................................................... 29
4.5.17
Protective functions .............................................................................................. 29
4.5.18
Electrical disconnect (safety interlock)................................................................. 30
4.5.19
Maximum generator torque................................................................................... 30
4.5.20
Salt-fog environment and oil-salt water ingestion ................................................ 30
4.5.20.1
Salt-fog.................................................................................................................. 30
4.5.20.2
Oil-saltwater ingestion .......................................................................................... 30
4.5.21
Fungus ................................................................................................................... 31
4.5.22
Sand and dust ........................................................................................................ 31
4.5.23
Vibration ............................................................................................................... 31
4.5.23.1
Test fixture inspection and preparation................................................................. 31
4.5.23.2
Vibration exposure level and duration .................................................................. 31
4.5.23.2.1
Test procedure for engine and gearbox mounted components ............................. 32
4.5.23.2.2
Test procedure for non-engine mounted components........................................... 32
4.5.24
Shock..................................................................................................................... 32
4.5.25
Humidity ............................................................................................................... 33
4.5.26
Rain intrusion........................................................................................................ 33
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