PRESSURE-ACTUATED 0.3-SECOND DELAY INITIATOR.- Seven 0.3-second delay initiators are installed between the guide rails. Two 0.3-second delay initiators are installed at the pilot's, the copilot's, and the SENSO station; and one is installed at the TACCO station. At the pilot's and copilot's stations, an Mk 11 MOD 0 initiator is installed on the 0.3-second delay initiator. The 0.3-second delay initiator is a pressure-actuated device with a conventional firing piston secured in the cocked position by a shear pin. In the ejection sequence, the 0.3-second delay initiators are used as time delays in the inertia reel shoulder harness retraction, in the INCOS trays retraction, and in the group or solo ejection sequencing of crew members in the firing of the rocket catapult( s).

MK 11 MOD 0 INITIATOR.- A MK 11 MOD 0 initiator is installed below the floor line directly under the rocket catapult at the pilot and copilot seat locations. Each MK 11 MOD 0 initiator is installed on the 0.3-second delay initiator, and both fire into the rocket catapult. The MK 11 MOD 0 initiator is a cartridge-actuated device triggered by gas pressure from a remote source. In the ejection sequence, the MK 11 MOD 0 initiators are used as time delays in the group-ejection (all seats) mode to allow the two aft seats to eject 0.5 second before the front seats to permit proper spacing of personnel for safe parachute deployment and landing.

PLUMBING AND CHECK VALVES.- Most plumbing for the aircraft-attached ejection seat components is flexible hose-type plumbing located between the guide rails. There are a minimum of lines between the forward and aft seats and the INCOS tray thrusters. There are twenty check valves installed in aircraft-attached ejection seat components; all are located between the guide rails. In the ejection sequence, the check valves allow the correct group or solo-ejection selection to occur.

INCOS TRAY THRUSTER.- At both the TACCO and SENSO locations, a thruster is installed to retract the respective INCOS trays during the seat ejection sequence. The thruster is a pressure/ percussion device that employs sear pins, firing pins, and primers to ignite the main charge. In the ejection sequence, the INCOS tray is retracted at the same time that the inertia reel shoulder harness retraction occurs.

EJECT MODE SELECTOR VALVE.- A selector valve is installed on each inboard guide rail in the flight station. The selector valve consists of a beam assembly with a switch and handle and the valve body. The selector valve routes high-pressure gas from the M99 initiators to the aircraft sequencing system, depending on the selected position (GROUP EJECT or SELF EJECT) of the selector valve. When the pilot's or copilot's selector valve handle is in the down or GROUP EJECT position, an electrical ground is completed, which causes the GROUP EJECT indicators to come on at the SENSO and TACCO instrument panels. When either selector valve handle is in the up or SELF EJECT position and the aircraft altitude is less than 15,000 feet, the altitude sensor switch cause the indicator

Figure 6-6. Aircraft mounted CAD's.

on the annunicator panel (located on the center instrument panel) to come on.