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Page Title:
Flight and Ground Loading Conditions. |
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|  MIL-S-85419 (AS)
axes. The shock wave form shall consist of ramp input with a
peak amplitude of 20 g's and a nominal duration of 11
milliseconds.
3.6.15.10 Flight and Ground Loading Conditions.
3.6.15.10.1 Design Loads. The starter/APU shall have sufficient
strength to withstand limit, ultimate, crash safety strength,
operating loads and repeated loads when normally mounted in the
aircraft.
3.6.15.10.2 Limit Loads. The starter/APU, when normally mounted
in the aircraft, shall meet the performance requirements of this
specification after application of the limit load factors shown
in Figure 12. There shall be no permanent set after application
of limit loads.
3.6.15.10.3 Ultimate Loads. The starter/APU, when normally
mounted in the aircraft, shall withstand ultimate loads of 1.5
times the limit loads derived from Figure 12. Distortion and
permanent set are permitted; however, there shall be no
structural failure. Starter operation is not required after
application of ultimate loads.
3.6.15.10.4 Starter Operation Loads. Loads caused by operation
of the starter/APU shall be considered in the design. A minimum
factor of safety shall be maintained.
3.6.15.10.5 Repeated Loads. The starter/APU shall be capable of
meeting the performance requirements of this specification
throughout the operational service life of the unit.
3.6.16 Inlet Air and Exhaust Systems. The starter/APU shall
provide its own inlet and exhaust systems in accordance with
Figures 1 thru 4.
3.6.17 Cockpit Control of Starter/APU. The starter/APU shall be
designed such that it can be initiated and operated automatically
with not more than two switches. One switch shall control all
main engine starts while the other will control the APU
operation.
3.6.17.1 Manual Stopping/Abort Device. By opening the cockpit
switches of 3.6.17, it shall be possible to terminate the
starter/APU operation at any time without damage to the
starter/APU.
3.6.18 Cutoff Device. The starter/APU shall be provided with a
speed responsive cutoff device which will shut down the unit when
the output drive speed reaches 3200 75 rpm in the start mode.
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