an aircraft oxygen system failure. A survival kit is in the
harness restraint, and the drogue parachute restraint.
seat bucket and is secured to the occupant's lower
This causes withdrawal of the personnel parachute
assembly from the seat at a preset interval after
ejection, provided an altitude sensing barostat has freed
the mechanism. Sticker clips on either side of the lower
restraint harness cause the seat to rotate away from the
Ejection seats not production-installed with the
occupant so that when the personnel parachute opens,
ECMO #1 command ejection capability, or not
the seat will not strike them.
incorporating ACC #496, provide for automatically
sequenced ejection of all crewmembers when the pilot
initiates ejection and also provides for individually
actuated ejections. Automatic sequencing cannot be
A guillotine breech and emergency restraint release
initiated by any crewmember other than the pilot.
is mounted on the right side of the seat bucket, the
breech connected by a pipe run to a guillotine unit on
The sequence of ejection and the time delay
the left upper side of the seat structure. Operation of the
interval (table 1-1) between individual seat ejections is
emergency restraint release will release the personnel
parachute container, survival kit, leg-restraint lines, and
NOTE: Automatic timing devices are preset, and
the upper and lower restraint harness. Also, a cartridge
the preset delay will be encountered whenever an
in the guillotine unit will fire, which will sever the
individual crewmember initiates ejection; for example,
personnel parachute withdrawal line and move the
the right front seat would fire 0.8 second after initiated
wedges in the sticker clip blocks to lessen the sticker
ejection. If all crewmembers eject individually and then
clip pullout load from 70 to 35 lb and prevent operation
the pilot ejects, his time delay is still 1.2 seconds.
of the upper and lower ejection handles.
Q1-1. Prior to entering a cockpit with an ejection
SEAWATER ACTIVATED RELEASE
seat, what precaution should you take?
Q1-2. State the purpose of varying the rocket motor
The SEAWARS provides a backup automatic mode
of separating the parachute from the crewmember.
Q1-3. The primary means of ejection is through the
Automatic release is for disabled crewmembers or
canopy, but if time permits, the canopy may be
when there is not enough time to manually open the
jettisoned at what maximum airspeed?
canopy release. The parachute harness sensing release
Q1-4. ECMO #1 ejects how many seconds after
units are designed to release the crewmember from the
parachute within two seconds after seawater entry.
Q1-5. In what time frame does the pilot eject after
ejection is initiated?
Each ejection seat has an emergency oxygen
PRINCIPLES OF OPERATION
supply in the survival kit, which is activated on ejection
LEARNING OBJECTIVE: Identify the
to supply gaseous oxygen during descent to ground
different types of ejections.
contact. It also can be manually operated in the event of
Table 1-1.--Sequence of Ejection
Left rear seat
0.0 second after ejection is initiated
Right rear seat
0.4 second after ejection is initiated (0.4 second after ECMO #3)
Right front seat
0.8 second after ejection is initiated (0.4 second after ECMO #2)
Left front seat
1.2 seconds after ejection is initiated (0.4 second after ECMO #1)