rib boom implementation

BOLTED REPAIRS1

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REPAIR IMPLEMENTATION

BOLTED REPAIRS2

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Before starting, ensure that you have:

• The right procedure• The right tools (in good condition)• The protective equipment


General instruction

Repair and details parts must be clean , dust and grease free

Assembly must be done with liquid shim

Details parts installation with sealant may be requested

BOLTED REPAIRS3

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LIQUID SHIM - GENERALITIES


Liquid shim

Use to fill gap between solid parts to:

- ensure a good landing of the repair parts and minimize interlaminar stresses due to clamp-up.- optimize load distribution through the fasteners.

Large gaps may create:• excessive bolt bending• non-uniform bearing stresses• eccentric load path.

Fastener installation is always done after liquid shim cure

Release agent is applied in the interface area on the repaired part before liquid shim application and curing. Release agent removed after liquid shim curing and before repair parts installation.

For bolted repairs in tank area, all repair parts are installed with sealant (in addition to liquid shim when requested)

REPAIR ACCOMPLISHMENT

REPAIR PARTS INSTALLATION

REMOVAL OF SURFACE PROTECTION

DAMAGE AREA PREPARATION

DAMAGE CUT-OUT

REPAIR PARTS SELECTION/MACHINING

REPAIR PARTS PREPARATION

METALLIC DOUBLER PROTECTION

FASTENERS INSTALLATION

BOLTED REPAIRS4

EXITMENU

LIQUID SHIM - GENERALITIES


Liquid shim

Use to fill gap between solid parts to:

- ensure a good landing of the repair parts and minimize interlaminar stresses due to clamp-up.- optimize load distribution through the fasteners.

Large gaps may create:• excessive bolt bending• non-uniform bearing stresses• eccentric load path.

Fastener installation is always done after liquid shim cure

Release agent is applied in the interface area on the repaired part before liquid shim application and curing. Release agent removed after liquid shim curing and before repair parts installation.

For bolted repairs in tank area, all repair parts are installed with sealant (in addition to liquid shim when requested)





DAMAGE CUT-OUT





BOLTED REPAIRS5

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DAMAGE CUT-OUT





Thickness: Depends on specific repair.- On THS, up to 1.5 mm thick, + sealant in fuel area (tank).- On vertical stabilizer, up to 0.5 mm

- Above these values liquid must be combine with solid shim.

REPAIR IMPLEMENTATION LIQUID SHIM

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BOLTED REPAIRS6

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During fastener and washer installation, ensure the sealant does not get on the bolt threads or the contacting faces of the washer and

nut/collar as it could cause incorrect pre-tension to be applied to the fastener.

SEALING / JOINTING

SRM 51-24-00 and 51-76-11 define the Sealing/jointing procedures and materials.

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GENERAL INSTRUCTION

SEALING

LIQUID SHIM

rib boom implementation

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