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MSA GA74H60-BQXXL, Maintenance Manual, Page: 18 / 23

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MSA GA74H60-BQXXL Maintenance Manual Download Page 18

Maintenance manual

 

MSA, Châtillon sur Chalaronne • Tél. +33 (0)474 55 01 55 •  
E-mail [email protected]

 

17 

 

APPENDICES: 

Replacement criteria

 

 
 

-

 

LH 050 PM and GM shell and fittings 

 
 

Sub-elements 

-

 

Defects 

Criteria 

-

 

Action 

Shell 

Cracks and/or 

scratches 

Aramid fibres damaged* 

Replace 

Aramid fibres  

not damaged* 

Nothing to report 

Impacts 

Height of fall > 1 m 

Replace 

Height of fall < 1 m 

Nothing to report 

Rail 

Riveting 

Defective 

Replace 

Attachment 

Coming apart 

Replace 

Breakage 

Defective 

Replace 

Wear 

Defective 

Replace 

Chinstrap mount 

Riveting 

Defective 

Replace 

Attachment 

Coming apart 

Replace 

Breakage 

Defective 

Replace 

Wear 

Defective 

Replace 

Edge seals 

Attachment 

Coming apart 

Rebond with glue 

 

Summary of Contents for GA74H60-BQXXL

Page 1: ...Maintenance manual PP020210 01 MAINTENANCE MANUAL FLIGHT HELMET LH 050...

Page 2: ...strap 5 22 2 Inner liner elements 6 22 3 Edge roll 7 22 4 Inner visor 8 22 5 Audio cable 9 22 6 Microphone unit and cover standard or winchman s 10 22 7 Mixed microphone boom 11 22 8 Microphone boom 1...

Page 3: ...artial damage to the shell and impact cap even if this damage is not immediately apparent replacement of the whole helmet is recommended after a major impact Users attention is also drawn to the dange...

Page 4: ...ists of two ear cups containing a housing for installing the earphones two ergonomic comfort ear seals The ear cups provide excellent ear protection and are fixed inside the shell by means of hook and...

Page 5: ...l 33 0 474 55 01 55 E mail info fr MSAsafety com 4 INTRODUCTION Important whenever you are handling the helmet make sure you put it down on its carry bag Tools required 7 mm flat spanner 2 mm hexagona...

Page 6: ...on the left side then take out the chinstrap levers by holding them by the ends To reinstall engage each lever making sure the chin cup is the right way round the return part of the strap should be up...

Page 7: ...g on the helmet size The ear cups and their adjustment pads 3 on each side 2 extra on each side The comfort liner is adjustable in 4 areas with 3 possible thicknesses N B When replacing the foam piece...

Page 8: ...it the shell by means of two fastening pins No tools are needed for its removal and reinstallation When removing the edge roll it is best to take out the ear cups and the neck pad first Then detach th...

Page 9: ...nt the direction of removal of the inner visor is perpendicular to the 2 rivets of the visor attachments To reinstall it check that the control levers of the inner visor are in the lowered position En...

Page 10: ...ar cup Remove the left ear cup Remove the neck pad make sure you do not break the piece of polystyrene inside it Put the ear cups inside the helmet Remove the edge roll see section 4 Unfasten the cabl...

Page 11: ...ng Pull off the plastic ring for the winchman s cover pull off the cover itself Remove the protective foam from the unit Then pull off the microphone unit to separate it from its base To reinstall it...

Page 12: ...moved and the 3 press studs on the left side of the edge roll should be undone Unplug the microphone s JST connector Remove the grommet from the shell Unscrew the central screw from the microphone boo...

Page 13: ...crewdriver Dismantling duration 1 minute Mounting duration 1 minute Inside the helmet remove the left ear cup For reassembly perform the same operations in reverse Perform the operations described in...

Page 14: ...ool None Dismantling duration 2 minutes Mounting duration 2 minutes Remove the grommet from the shell push it out from inside Outside Inside Inside the helmet remove the left earphone Remove the inner...

Page 15: ...or flat spanner Dismantling duration 3 minutes Mounting duration 4 minutes To remove the earphones take out the ear cups For each ear cup Remove the fabric seal Remove the 2 acoustic foam pieces Pull...

Page 16: ...articularly adhesion of chinstrap mounts slight impacts due to normal use 3 months Condition of impact cap and rim in particular adhesion of impact cap to rim 3 months Attachment of impact cap to shel...

Page 17: ...rmation of the composite fibres in the shell Damage to the composite shell consisting of composite fibres that have been cut or shredded Removal of the outer coating leading to damage to the gel coat...

Page 18: ...Aramid fibres damaged Replace Aramid fibres not damaged Nothing to report Impacts Height of fall 1 m Replace Height of fall 1 m Nothing to report Rail Riveting Defective Replace Attachment Coming apar...

Page 19: ...lacement of the shell Paint scratch Scratch to paint and gel coat but no damage to aramid or carbon Defect where the aramid and or carbon are showing The appearance of aramid and or carbon filaments m...

Page 20: ...or more traces of impacts on the outside the shell must be replaced Specific traces of an impact inside the shell concentric white lines matching the cracks on the outside The appearance of carbon fil...

Page 21: ...white marks Sub elements Defects Criteria Action Rim White mark on the carbon Part close to leather rayon Nothing to report Breakage Defective Replace Weld Crack Replace Attachment Coming apart Repla...

Page 22: ...5 mm depth 0 05 mm Quantity 5 Replace part Quantity 2 Replace part Quantity 16 Replace part Zone 4 All None Sub elements Defects Criteria Action Velcro hooks Coming apart Minor Nothing to report Comi...

Page 23: ...Free Replace chinstrap assembly or locking clip Chinstrap lever or scale Crack Defective Replace chinstrap assembly or chinstrap attachment Strap Stitching Defective Replace chinstrap assembly or stra...

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