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|  MIL-S-85419 (AS)
turbine engine including electrical starter and a generator; a
sequence and safety control unit; an ignition unit including the
ignition lead; a generator control unit; and a start contactor.
The gas turbine engine shall consist of a gas generator section
and a power output section, The gas generator will provide hot,
high pressure gas to drive the power output section and will
incorporate an accessory gear train to drive necessary
accessories for operation of starter/APU and to be driven by an
electric starter motor to initiate gas generator operation. The
power output section through a power turbine and reduction
gearbox shall be capable of driving the aircraft engine for
starting purposes; be capable of driving a 6KVA electrical
generator during APU operation without driving the engine; and be
capable of going from APU mode to start mode without shutting
down.
3.6.4 Envelope. The gas turbine engine shall be contained
within the envelope shown in Figures 1 thru 9. The unit shall
not exceed this envelope when hot.
3.6.5 Mounting Provisions. The gas turbine engine shall mount
on an accessory drive conforming to U.K. Standard RS623 with
7.200" O.D. V-flange which is suitable for a V-groove, quick
attach/detach clamp supplied with the aircraft engine. Adaptor
and drive details are shown in Figure 9. Direction of rotation
(viewed from the anti-output shaft end) is clockwise.
3.6.6 Weight. The portion of the starter/APU supported by the
engine drive pad shall not exceed 129 lbs. dry weight nor shall
the resulting overhung moment exceed 970 in-lbs. The sequence
and safety control unit weight shall not exceed 4.5 lbs. The
high energy ignition unit weight shall not exceed 2.6 lbs. The
start contactor weight shall not exceed 2.6 lbs.
3.6.7 Containment. The starter shall provide complete
containment of all fragments and shall remain on its mount should
failure occur under any operating condition. Failures included
are those that occur due to uncontrolled acceleration of the gas
generator and failure of the overrunning clutch of the output
drive assembly. The containment shall also, in the event of
failures, prevent fire external to the starter and external
surface temperatures from exceeding 500F.
3.6.8 Overspeed Protection. The starter/APU shall incorporate a
means to prevent the overspeeding of any rotating component
resulting from a "no load" or any other condition. The overspeed
device shall safely limit the speed of the rotating parts and cut
off the fuel supply. If this overspeed protection is remotely
mounted any loss of electrical power or signal shall cause the
cutoff of the fuel supply.
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