CHAPTER 6 EJECTION SEAT SYSTEMS

Ejection seat system sequencing schematic

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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CHAPTER 6 EJECTION SEAT SYSTEMS Terminal Objective: Upon completion of this chapter, you will be able to recognize the components of and maintenance procedures for the removal, installation, and operational test and check of ejection seat systems. Today’s modern high-performance naval air- craft make extreme demands on emergency escape devices. The most critical time for ejection from aircraft is at low altitudes, especially on takeoffs and landings. The ultimate in seat reliability y is one that safely ejects the occupant at zero airspeed and zero altitude or at low altitudes under high sink rate and/or adverse attitude conditions. Today there are a number of different seats in the inventory of naval aircraft. Each of these seats is produced in various models to fit the escape requirements of many aircraft. As aircraft evolve, new needs and criteria dictate changes to seat systems. You will see many of these equipment changes during the time you spend in the Navy. As examples of ejection seats, this chapter will cover the following three types of seat systems: Section 1 - ESCAPAC lE1 ejection seat Section 2 - MARTIN-BAKER SJU-5/A ejec- tion seat section 3 - STENCEL SJU-8/A ejection seat ESCAPAC lE - 1 EJECTION SEAT Learning Objective: Recognize the com- ponents, maintenance requirements, emergency survival equipment, and cartridge-actuated devices (CAD) for the ESCAPAC 1E-1 ejection seat. The lE-1 ESCAPAC ejection seat is a rocket assisted ejection system that provides a quick and safe means of escape from an aircraft. The ESCAPAC seat provides escape capability from ground level at zero-knots airspeed to all altitudes and airspeeds within the operational limits of the aircraft. The ESCAPAC seat has several variations between models. Seat modifications have been incorporated to give the occupant an improved escape and recovery system that assures directional stability during ejection and positive seat-man separation. A manual backup is provided to allow over-the-side bailout as well as emergency egress from the aircraft. In this section we will discuss the ESCAPAC 1E- 1 ejection seat used in the S-3 aircraft. SYSTEM DESCRIPTION Following ejection initiation, the lE-1 ESCAPAC system is fully automatic through rocket thrust and burnout, seat-man separation, and parachute opening. The 1E- 1 ejection seat is a very reliable seat system that is initiated by pulling either the primary (face curtain) or secondary (lower) ejection control handle (fig. 6-1). Two cables attached to the primary ejec- tion control handle, or a single cable attached to the secondary ejection control handle, cause the firing control disconnect assembly to pivot for- ward. Two attached arms move two firing rods aft to actuate the acutating mechanism, which fires the M99 initiator(s) located between the guide rails. Through the aircraft-attached sequencing system, the power inertia reel hauls back the shoulder harness and stows the tactical air coordinator (TACCO) and sensor operator (SENSO) INCOS trays. Simultaneously, hot gas pressure from the M99 initiators(s) activates an 6-1

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