Egress System
T-45C TS, ADV & IUT ENG-15
(12) Leg restraint system activated
(13) End of catapult travel
NOTE: Near the end of the catapult stroke,
the rocket initiator static lines become taut
and withdraw the mechanism sears. Gas
pressure from the rocket initiator cartridge
is directed to the following items.
(a) Start switch plungers (commence
sequencer timing)
(b) Barostatic release unit
(c) Pitot mechanism to deploy pitot heads
(d) Underseat rocket motor
NOTE: The underseat motor is fired to
sustain catapult thrust and ensure that
the seat clears the aircraft.
(14) Ejection mode sequence
Sg 2, fr 32
Fig 6: Modes of
(a) Mode determined by electronic
Operation
sequencer based on altitude and
airspeed data from pitot heads at time
of ejection
NOTE: The ejection mode sequence
follows one of five modes. Modes 1, 2,
and 3 are defined to include ejection
where the aircraft is operating at low
altitudes and airspeeds. Mode 4
occurs at intermediate altitudes and
any airspeed. Mode 5 occurs at high
altitudes (greater than 18,000 ft) and at
any airspeed.
(b) Drogue chute deploys onto bridles,
regardless of mode selected, to
stabilize and decelerate seat
(9-98) Change 4
Page 15-28
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