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|  MIL-S-19557/10A(AS)
REQUIREMENTS (cont'd)
Applicable paragraphs
of MIL-S-19557C(AS)
Initial Calibration: (at 59F Standard Day Inlet Air
4.5.4
Conditions)
NOTE: The performance rating torques do not include
allowances for inlet pressure and temperature
tolerances, steady state to transient torque
correction, or simulated AMAD gearbox losses
as required to reflect test conditions.
Main Engine Start Mode:
1.
DRIVE SPEED
AIRFLOW
DRIVE TORQUE
DRIVE SPEED
LB/MIN
RPM
LB-FT
CONDITION
142 MAX.
167 MIN.
0
Stall
Rated
142 MAX.
100.6 MIN.
7500 (30%)
142 MAX.
cutout
34.3 MIN.
15,000 (59%)
2.
Ground Maintenance Subsystem Check-Out Mode:
DRIVE SPEED
AIRFLOW
DRIVE TORQUE
DRIVE SPEED
LB/MIN
RPM
LB-FT
CONDITION
122 MAX.
Stall
132.0 MIN.
0
Rated
122 MAX.
18.6 MIN.
15,000 (60%)
No-Load Operation:
4.5.5
Time: 60 Seconds
Inlet Conditions:
Total Pressure 46 1 psia
Total Temperature 445 15F
Minimum Output Drive Speed: 17,500 rpm
Endurance Test: Total operation to consist of: 6000
4.5.6
Main Engine Start cycles, 250 Main Engine Crossbreed
start cycles, 750 Ground Maintenance Check-out cycles
and 500 Motoring cycles. Cycles to be conducted at
rated conditions of para. 3.5.1 as follows:
(2)
(1)
MAIN ENGINE START/
CROSSBLEED START
Phase B -
Phase C-
Phase A -
Test Stand
Acceleration
Rotor Polar Acceleration
Stabilized Conditions
Drive
Drive
Drive
Drive
Moment of
Torque Time
Time
Time
Speed
Inertia
Speed
Speed
RPM
RPM
LB-FT Sec
Sec
RPM
Sec
8.O 2
(TYP)
(MIN)
50
(MIN)
50
(TYP)
LB-FT
15,130 (60%)
31.5
7500 (30%) 77 10
7500 (30%) 8
(1) 81.7
7500 (30%) -- 10
15,130 (60%) 24
7500 (30%) 8
(2) 81.7
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