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Page Title:
Ground Maintenance Subsystem Check-Out Mode |
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|  MIL-S-19557/10A(AS)
REQUIREMENTS (cent'd)
Applicable paragraphs
of MIL-S-19557C(AS)
2.
Ground Maintenance Subsystem Check-Out Mode:
Operating time - Continuous
Output Drive Speed - (59%) 15,000 rpm
output Drive Torque - 18.6 lb-ft MINIMUM
Inlet Air Total Pressure - 46 psia
Inlet Air Total Temperature - 360F
Inlet Air Flow - 122 lb/rein MAXIMUM
3. Cross Bleed Start:
Operating Time: 1 minute maximum
Inlet Air Total Pressure: 60 psia
Inlet Air Total Temperature: 11OOF
Inlet Air Flow: 142 lb/rein maximum
3.5.1
Cutout Speed: Primary cutout speed is (60%) 15,130
100 rpm controlled by aircraft electrical system.
Secondary cutout speed is (64 1%) 16,140 250 rpm
controlled via the starter output drive speed sensor
signal fed to a remotely mounted frequency sensing
relay (FSR).
Automatic Shutoff Control: Output drive speed sensor
3.5.7
to be provided as shown on Figures 1 and 2 for
control operation. The speed sensor should provide
an output signal frequency of 6354 to 6556 HZ (24
tooth signal generator) at the secondary (64%)
starter cutout speed. Minimum speed signal voltage
output shall be 3.5 volts peak to peak at output
drive speeds of 4290 rpm (17%) and above when
measured with a resistive load of 1.5K OHMS and the
speed sensor shimmed to the maximum allowable gap.
The maximum peak to peak voltage output shall not
exceed 30 volts.
Altitude: The starter shall operate satisfactorily
3.5.8
up to and Including 25,000-ft altitude. The starter
shall not be damaged when subjected to 75,000-ft
altitude in the overrunning mode of operation.
Attitude: The starter shall be capable of operating
3.5.9
In any flight attitude as shown in Figure 4.
4.2.2
Inspection/Acceptance Test: Additional test
requirements are:
(1) Operate at Ground Maintenance Subsystem Check-out
conditions per para. 3.5.1 for a minimum period of 30
minutes. During this period, conduct the following
runs:
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