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|  MIL-S-22518 /2(AS)
REQUIREMENTS
(Continued)
Applicable paragraphs
of MIL-S-22518A(AS)
Rated Conditions:
3.5.1
Starter (Pad "A):
Drive Speed (RPM): 1200
Drive Torque, Min (Lb-Ft): 290
Airflow, Max (Lb per Min): 110
Inlet Air Total Pressure (In. Hg A): 100
Inlet Air Total Temperature (F): 345
29.9
Exhaust Gas Discharge Pressure (In. Hg A):
Accessory Drive (Pad "B"):
Continuous: 20 HP at 4300 RPM
Intermittent: 40 HP at 4300 RPM for 5 minutes
Maximum: 55 HP at a Pad "A" speed of 6800 RPM
for period specified in 4.5.7
At an input speed of 7200 RPM at pad "A" drive, pad "B" drive
NOTE :
shall rotate at 4320 --10 RPM.
+
cutout RPM:
3200 plus 200 minus 0
3.5.1
3.5.2
Maximum Temperature Limit: The air turbine shall be
capable of operating at a maximum inlet air
3.5.8
total temperature limit of 650F at rated
inlet air total pressure.
Altitude: The ATS/AD shall not be damaged when subjected
3.5.8
to 75,000 ft altitude in the overrunning mode
4.5.17
of operation. The ATS/AD shall be capable of
developing rated drive speed and torque at an
8000 ft altitude in the starter mode of operation.
Operating as an accessory drive the ATS/AD shall
complete 20 cycles of the test schedule of Figure 2.
3.5.9
Attitude: The ATS/AD shall be capable of meeting
the operational requirements when the ATS/AD
4.5.16
longitudinal axis, through the pad "A" shaft,
is in any position within 10 degrees of the
horizontal position. Inverted flight test time
is 15 minutes.
Overrunning (Qualification): The ATS/AD shall be
3.5.10
overrun at a 7250 RPM pad "A" drive speed for a
4.5.10
total of 20 hours. Testing need not be continuous
but test periods shall not be less than 5 hours.
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