US Navy Course Aviation Structural Mechanic E NAVEDTRA 14327
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NONRESIDENT TRAINING COURSE Aviation Structural Mechanic E NAVEDTRA 14327 IMPORTANT Any future change to this course can be found at https://www.advancement.cnet.navy.mil, under Products. You should routinely check this web site. DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. PREFACE About this course: This is a self-study course. By studying this course, you can improve your professional/military knowledge, as well as prepare for the Navywide advancement-in-rate examination. It contains subject matter about day- to-day occupational knowledge and skill requirements and includes text, tables, and illustrations to help you understand the information. An additional important feature of this course is its reference to useful information in other publications. The well-prepared Sailor will take the time to look up the additional information. Any errata for this course can be found at https://www.advancement.cnet.navy.mil under Products. History of the course: ● Aug 2002: Original edition released. Authored by AMCS(AW) Rodel Henry and AMEC(AW) Ronnie Patton. ● Jan 2004: Administrative update released. Entered errata. No significant content changes were made. Published by NAVAL EDUCATION AND TRAINING PROFESSIONAL DEVELOPMENT AND TECHNOLOGY CENTER https://www.cnet.navy.mil/netpdtc POINTS OF CONTACT ADDRESS ● E-mail: [email protected] COMMANDING OFFICER ● Phone: NETPDTC N331 Toll free: (877) 264-8583 6490 SAUFLEY FIELD ROAD Comm: (850) 452-1511/1181/1859 PENSACOLA, FL 32509-5000 DSN: 922-1511/1181/1859 FAX: (850) 452-1370 Technical content assistance. Contact a Subject Matter Expert at https://www.advancement.cnet.navy.mil/welcome.asp, under Exam Info, contact your Exam Writer. NAVSUP Logistics Tracking Number 0504-LP-101-4045 TABLE OF CONTENTS CHAPTER PAGE 1. Martin-Baker MK-GRUEA-7 Ejection Seat............................................................. 1-1 2. Navy Aircrew Common Ejection Seat (NACES) .................................................... 2-1 3. Canopy Systems........................................................................................................ 3-1 4. Explosives Handling Personnel Qualification and Certification Program................ 4-1 5. Utility Systems.......................................................................................................... 5-1 6. Air-Conditioning and Pressurization Systems .......................................................... 6-1 7. Oxygen Systems........................................................................................................ 7-1 8. Oxygen Support Equipment...................................................................................... 8-1 APPENDIX I. Glossary..................................................................................................................... AI-1 II. References ................................................................................................................. AII-1 ASSIGNMENT QUESTIONS follow Appendix II. CHAPTER 1 MARTIN-BAKER MK-GRUEA-7 EJECTION SEAT The EA-6B aircraft is equipped with the ground or deck, and they must never be removed until Martin-Baker MK-GRUEA-7 rocket-assisted ejection the aircraft is ready for flight. seat. The MK-GRUEA-7 seat provides crewmembers The following general precautions should always with completely automatic escape at ground level (zero be kept in mind: altitude, 80-knot minimum) and throughout the entire speed and altitude range of the aircraft. • Ejection seats must be treated with the same respect as a loaded gun - always consider an This chapter discusses the system description, ejection seat system as loaded and armed. operating principles, and components of the MK-GRUEA-7 seat. • Before you enter a cockpit, know where the ejection seat safety pins are located and make SAFETY PRECAUTIONS certain of their installation. LEARNING OBJECTIVE: Identify the • Only authorized personnel may work on, safety hazards and general safety precautions remove, or install ejection seats and compo- when working on ejection seats. nents, and only in authorized areas. The MK-GRUEA-7 emergency escape system has Supervisors take note: It has been said that nothing several explosive cartridges and rockets with propellant is foolproof because fools are so ingenious. Personal charges. Accidental firing of any of these may cause safety for those who work around ejection seats cannot serious or fatal injury to personnel on or near, the be guaranteed; however, a high level of safety can be aircraft. achieved if personnel have the proper attitude, understanding, training, and supervision. Unless proper maintenance procedures are followed exactly, even routine ejection seat maintenance tasks can bring about WARNING an accident or injury. Education of the workers is the Ejection control handle safety pins and best assurance for personnel safety. The workers should safe/armed handles are provided to render the be made aware of potential hazards and the proper ejection seats safe when the aircraft is parked on the means of protecting themselves. ground. The ejection control handle safety pins are removed by the aircrew before flight and installed by SYSTEM DESCRIPTION the plane captain after flight. Movement of the safe/armed handle is the responsibility of the aircrew. LEARNING OBJECTIVES: Describe the function and capabilities of the Martin-Baker Before entering the cockpit, personnel should MK-GRUEA-7 ejection seat. Identify the ensure that the correct safety precautions have been sequence and time delay intervals between seat applied. ejections. This section will describe system operation Safety precautions must be strictly observed when involving the following components: lower ejection working around aircraft with an ejection seat. Each handle, emergency restraint release, rocket motor, ejection seat has several ground safety pins on drogue parachute assembly, guillotine breech, seawater red-flagged lanyards at every point of possible danger. activated release system (SEAWARS), survival kit, and They must be installed whenever the aircraft is on the automatic sequencing system. 1-1 The aircraft has four Martin-Baker MK-GRUEA-7 (primary firing control), the seat functions as a rocket-assisted ejection seats (fig. 1-1) installed for the completely automatic system. Each seat is fitted with a pilot and three electronic countermeasures officer gas-operated harness retraction unit, which ensures that (ECMO) crewmembers. the seat occupant’s upper body is correctly positioned and retained to enable the occupant to withstand the All seats are identical in operation and differ only forces of ejection. The occupant’s upper restraint in time delay firing mechanism assemblies and in the harness is pulled in and locked, and on leaving the rocket motor inboard nozzle diameter, located on aircraft, the occupant’s legs are withdrawn, the opposite sides, so that during ejection, each seat takes a emergency oxygen supply is started, the timing devices different path. Because of this, certain components of of both the drogue gun and the time-release mechanism the seat assemblies are designed to ensure that each seat assemblies are started, and the rocket motor initiator can be fitted only to its correct position. The seat gives fires the rocket motor. When clear of the aircraft and the occupants a maximum degree of comfort on long approximately at the rocket motor burnout, the drogue flights by including ventilated seat-position actuators. gun fires to deploy the stabilizing drogue parachutes. Each seat has height adjustment while only the pilot’s With the proper altitude and time conditions satisfied, seat has both height and tilt (FWD/AFT) adjustment. the time-release mechanism will activate the restraint The primary means of ejection is through the release system and deploy the personnel parachute, canopy. If time permits, the canopy may be jettisoned separating the occupant from the seat as the personnel (only below 250 knots indicated airspeed [KIAS]) prior parachute inflates. to ejection. There is no interlock mechanism in this aircraft between the ejection seat and the canopy LOWER EJECTION HANDLE jettison system. The canopies must be jettisoned as a separate function. The lower ejection handle is on the forward face of the seat bucket in case injury or high-g conditions Once ejection is initiated by command-sequenced prevent the occupant from reaching overhead to use the ejection or by individual activation of the face curtain face curtain. EMERGENCY RESTRAINT RELEASE An emergency restraint release control fires the guillotine, severing the personnel parachute withdrawal line from the drogue parachutes and also allowing the occupant to release all restraints as well as the personnel survival equipment. This gives the occupant manual escape from the seat in the event of failure of the automatic release system or during crash and ditching conditions. ROCKET MOTOR The thrust produced by the ejection gun is added to by the rocket motor, which enables the ejection seat to reach at least an 80-knot speed, zero-altitude. DROGUE PARACHUTE ASSEMBLY After ejection, the ejection seat and occupant are stabilized and decelerated by a duplex drogue parachute assembly, which is rapidly developed by a cartridge-operated drogue gun. A time-release AMEf0101 mechanism assembly mounted on each seat Figure 1-1.—Martin-Baker MK-GRUEA-7 rocket-assisted automatically releases the personnel parachute ejection seat. container, the survival kit, the