SRB Return to Flight Activities

David M. MartinSolid Rocket Booster Project

Manager

Solid Rocket Booster (SRB) Attach Point

Forward Booster

Separation Motors (BSMs)

Aft BSMs

SRB/External Tank Forward

Interface

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BOLT CATCHER ASSEMBLY

External Tank

SRB

SRB ET

ET/SRB Forward Attach Area

ETSRB

Bolt Catcher

Separation Plane

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Pressure Cartridge

NASA Standard Initiator

(NSI)

Forward Separation Bolt

Pressure Cartridge Body O-ring

NSI O-ring

NASA STANDARD INITIATOR PRESSURE CARTRIDGE

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INSTRUMENTED BOLT CATCHER

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DROP TEST FIXTURE

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es BOLT CATCHER ON FIRING FIXTURE

Solid Rocket Booster (SRB) Attach Point

Forward Booster

Separation Motors (BSMs)

Aft BSMs

SRB/External Tank Forward

Interface

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Igniter Case

Igniter Propellant Grain

Igniter Adapter

Igniter Retainer

Igniter RodBKNO3 bags

BSM Cross-section

BSM Igniter Cross-section

Propellant

Liner

Case

Exit Cone

Graphite throat

Closure

Igniter

BOOSTER SEPARATION MOTOR IGNITER

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BSM Igniter Pressure Data vs. Time

0

500

1000

1500

2000

2500

0.0000 0.0200 0.0400 0.0600 0.0800 0.1000 0.1200 0.1400 0.1600 0.1800 0.2000Time (s)

Pres

sure

(psia

)

BSM8368BSM8251BSM8367

Nominal Pressure TraceErratic Pressure Traces

BSM IGNITER ERRATIC PRESSURE ISSUE

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IGNITER GRAIN BEVEL

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es IGNITER RETAINER DESIGNS