Análisis de textos y percepción de algunas medidas de dispersión en los

The emergency egress system consists of two window/hatch external jettison handle/initiators, three window/hatch internal jettison handles/initiators, window and hatch explosive charges, fillet-severance and fillet-support severance explosive-shaped charges, SMDC, FCDC, and SMDC one-way transfers.

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Figure 3-8.—Emergency egress system components and plumbing.

AMEf0308

Window/Hatch External Jettison Handle/Initiator

Two external jettison initiators (fig. 3-9) are installed inside access doors on each exterior side of the aircraft just below and forward of the windshield aft posts. The external jettison initiator is a mechanically fired device, with the firing pin relaxed (not precocked) before handle actuation. The sear mechanism is a conventional ball-and-node type, which disengages completely after 3/4 inch of travel. During travel, the firing pin withdraws, but the handle does not disengage.

The primer fires into a lead charge, which fires the output charge. The external jettison initiators have no safety pins, but use a 10-foot lanyard to protect against inadvertent initiation. Any partial withdrawal of the handle from the external jettison initiator is cause for rejection and replacement. Either external initiator will cause all windows, hatches, fillets, and fillet supports to blow away from the aircraft.

Window/Hatch Internal Jettison Handle/Initiator Three internal jettison initiators (fig. 3-10) are located in the crew compartment: one at the eyebrow panel and one each at the tactical coordinator (TACCO)

and sensor operator (SENSO) instrument panels. The internal jettison initiators are the squeeze-to-pull type, which have a quick-release safety pin in the squeeze segment of the operation for safetying. The pilot/copilot handle will blow all windows and hatches, whereas the TACCO and SENSO handles will blow only the hatch above the crewmember. The basic internal jettison initiators are similar to the external jettison initiators except for the handle and the absence of the lanyard feature.

Window-Severance Explosive Charge

An explosive charge is attached to the inside periphery of the pilot and copilot windows. An SMDC or FCDC connects to a transfer block at the lower front corner of the explosive charge. The window explosive charge is actuated by the pilot/copilot internal jettison initiator or by either external jettison initiator through the SMDC and FCDC segments. The explosive charge acts as the cutting device for the window glass.

Hatch-Severance Explosive Charge

The hatch explosive charge is similar to the window explosive charge. The explosive charges of the

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Figure 3-9.—External canopy and hatch jettison initiator.

AMEf0309 INITIATOR

(INSTALLED)

DOOR

CAP

BOOSTER ASSY

OUTLET PORT FOR SMDC ASSY

BODY

FIRING PIN

WIRE LANYARD

(10 FT) SEAR

SHIELD PIN HANDLE

PULLHATCHSEVERANCE

hatches can be actuated by the external jettison initiators or by the pilot/copilot internal jettison initiator.

The TACCO or SENSO hatch explosive charges can be actuated individually by the respective TACCO or SENSO handle/initiator.

Fillet-Severance Explosive-Shaped Charge

Each right and left upper wing-to-fuselage fillet has an explosive-shaped charge attached near the outer and rear fillet attachments (fig. 3-11). The explosive-shaped charge cuts the attached fillet from the aircraft to allow complete egress of the respective hatch. A fillet support is cut by a second explosive-shaped charge attached at the bottom.

The fillet-support severance explosive-shaped charge is attached at the bottom of the internal fillet support to cut the support, allowing the fillet to separate from the aircraft during the emergency egress system operation.

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Figure 3-11.—Fillet FLSC assembly.

CAP SPRING

TRANSFER BOOSTER ASSEMBLY

OUTLET PORT FOR

SMDC ASSEMBLY

SAFETY PIN SEAR PIN

FIRING PIN BODY

AMEf0310

Figure 3-10.—Internal canopy and hatch jettison initiator.

AMEf0 113 FILLET

HATCH

CANOPY

CHARGE HOLDER (SILICONE RUBBER)

VOID FIBERGLASS

RETAINER FLEXIBLE LINEAR SHAPED CHARGE (LEAD SHEATH) SQUEEZE-TO-PULL

TYPE HANDLE

QUICK-RELEASE PIN STRUCTURE

INTERNAL HANDLE INITIATOR

Shielded Mild-Detonating Cord and Flexible Confined Detonating Cord

The SMDC and FCDC segments act as the plumbing for the emergency egress system. The SMDC and FCDC connect all external and internal jettison initiators; all connectors, tees, and manifolds or one-way transfers; all explosive charges; and all explosive-shaped charges. When initiated, the extremely high velocity and pressure of the cord is focused onto the end of the next adjacent SMDC segment, which acts as acceptor charge.

Shielded Mild-Detonating Cord One-Way Transfer

Two SMDC one-way transfers are located on the pilot and copilot bulkhead. The SMDC one-way transfer acts as a check valve or one-way detonating transfer device. The SMDC one-way transfer is a self-contained unit housing a sealed receptacle for dual-shaped charges. Any detonating entering the in ports will transfer to the out port. Any detonation originating from the aft port (TACCO or SENSO) segment of the SMDC one-way transfer will not transfer forward. This would occur when either the TACCO or SENSO elects to cut the respective hatch;

the remaining two windows and the opposite hatch would not be affected.

OPERATION

The emergency egress system is initiated from any one of the five positions: two on the outside of the flight station, and three located in the crew compartment at the eyebrow panel and at the TACCO and SENSO instrument panels. All windows and hatches are cut and blown outward by the actuation of either external jettison initiator and by the pilot/copilot internal jettison initiator. The TACCO and SENSO internal jettison initiators cut only the respective panel next to the crewmember. The emergency egress system is used primarily for ground and water rescues. The handle/initiators have a trigger action. Once the emergency egress system is actuated, the emergency egress system will respond to completion without

further action by crewmembers. The functional sequence is from the handle/initiator (anyone), to the SMDC, to the explosive charge, which is the actual cutting tool for the window or hatch glass. If either or both the TACCO and SENSO hatches are to be blown, the respective fillet and fillet support will be cut to allow complete egress of the hatch. When either the TACCO or SENSO crewmember actuates the handle/initiators, the opposite hatch and the two flight stations windows will not be cut, since the SMDC one-way transfer (check valve) restricts transfer of pyrotechnic energy flow in one direction.

The emergency egress system is entirely self-sufficient and completely independent. The emergency egress system does not depend on any other aircraft system, nor does the emergency egress system air, assist, or sequence with another system. The SMDC is considered to be more reliable and much faster than a comparable hot gas system. The emergency egress system is safer from the standpoint of inadvertent actuation due to the extremely high initiating velocities and pressures. The high operating velocity is much too fast to permit emergency egress system initiation by ordinary sawing, filing, drilling, or hammering. With quick-release safety pins properly installed, the emergency egress system is virtually inert.

Q3-26. What is the purpose of the frangible escape system?

Q3-27. The S-3 emergency egress system is more susceptible to inadvertent actuation than hot gas systems. True or false?

Q3-28. Instead of safety pins, the external jettison initiators use what type of component to protect against inadvertent initiation?

Q3-29. How many internal jettison initiators are located in the crew compartment?

Q3-30. The and connect all external and internal jettison initiators.

Q3-31. What component restricts transfer of pyrotechnic flow in one direction?

Q3-32. The emergency egress system is virtually inert when what component is properly installed?

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CHAPTER 3

ANSWERS TO REVIEW QUESTIONS

A3-1. Pneumatic pressure from externally serviced reservoirs A3-2. Reference mark

A3-3. Acrylic A3-4. Hydraulically

A3-5. It regulates the speed of the canopy-lock pneumatic actuator during locking and unlocking of the canopy.

A3-6. 225 psi

A3-7. (a) 225 cubic inch, (b) 3,000 psi A3-8. Reservoir relief valve

A3-9. Downstream of the auxiliary pneumatic reservoir A3-10. Three-port pressure operated

A3-11. Five A3-12. Hold A3-13. 10 seconds A3-14. Auxiliary opening

A3-15. To provide an airtight seal between the canopy assembly and the aircraft structure to maintain cockpit pressurization

A3-16. 25 ± 5 psi

A3-17. Service air heat exchanger A3-18. Check valve

A3-19. XSMDC, FCDC, and SMDC A3-20. Internal canopy initiators A3-21. Canopy jettison gas generator A3-22. Inert connectors and manifolds A3-23. SMDC

A3-24. One-way explosive transfers A3-25. Ground emergency conditions

A3-26. Provides a means of escape from the aircraft for crewmembers after ditching or after a wheels-up landing by initiation of explosive charges to blow out windows and hatches

A3-27. False

A3-28. 10-foot lanyard A3-29. Three

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A3-30. SMDC, FCDC

A3-31. SMDC one-way transfer valve A3-32. Safety pins

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CHAPTER 4