human factors problems
DESCRIPTION
Human Factors Problems. And the Design of the M-16 Rifle. History of the M-16. First introduced in the Vietnam War Initial design had many flaws Jammed Misfired Unreliable. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/1.jpg)
Human Factors ProblemsHuman Factors Problems
And the Design of the And the Design of the M-16 RifleM-16 Rifle
![Page 2: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/2.jpg)
![Page 3: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/3.jpg)
History of the M-16History of the M-16
First introduced in the First introduced in the Vietnam WarVietnam WarInitial design had Initial design had many flawsmany flaws– JammedJammed– MisfiredMisfired– UnreliableUnreliable
![Page 4: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/4.jpg)
““The weapon has failed us at crucial The weapon has failed us at crucial moments when we needed fire power moments when we needed fire power most. In each case, it left Marines naked most. In each case, it left Marines naked against their enemy. Often, and this is no against their enemy. Often, and this is no exaggeration, we take counts after each exaggeration, we take counts after each fight, as many as 50% of the rifles fail to fight, as many as 50% of the rifles fail to work.”work.”
![Page 5: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/5.jpg)
Major Design ProblemsMajor Design Problems
Cyclic RateCyclic Rate
Trigger & FireTrigger & Fire
ControlControl
HandguardHandguard
Mag CapacityMag Capacity
Target SightingTarget Sighting
![Page 6: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/6.jpg)
Cyclic RateCyclic Rate
Too highToo high– Resonant Mechanisms Resonant Mechanisms
designed for certain designed for certain number of roundsnumber of rounds
MisusedMisused– JammedJammed– Increased workloadIncreased workload
Hydraulic Buffers Hydraulic Buffers
![Page 7: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/7.jpg)
Trigger & FireTrigger & Fire
Semi-automatic & Full-automatic Fire Semi-automatic & Full-automatic Fire ModesModes
Selector Switch on side of gunSelector Switch on side of gun– Inconvenient Inconvenient – Loss of valuable time in battleLoss of valuable time in battle
![Page 8: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/8.jpg)
Trigger & Fire Trigger & Fire (continued)(continued)
TAC triggerTAC trigger– No release of trigger necessaryNo release of trigger necessary– In action, can be the difference between life In action, can be the difference between life
and deathand death
![Page 9: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/9.jpg)
ControlControl
M16 kickbackM16 kickback– Up and to the rightUp and to the right– InaccuracyInaccuracy
Dangerous in training and on battle fieldDangerous in training and on battle field
Muzzle BrakeMuzzle Brake
![Page 10: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/10.jpg)
HandguardHandguard
MaintenanceMaintenance– Locks difficult to removeLocks difficult to remove
Possible design changePossible design change– Pressurized lockPressurized lock– However, unrealistic without complete However, unrealistic without complete
redesignredesign
![Page 11: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/11.jpg)
Mag CapacityMag Capacity
Largest ammunition magazine holds only Largest ammunition magazine holds only 30 rounds30 rounds– In full auto mode, rounds quickly depletedIn full auto mode, rounds quickly depleted
Advantageous to double magazine Advantageous to double magazine capacitycapacity– Less time spent on reloadingLess time spent on reloading
![Page 12: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/12.jpg)
Mag Capacity Mag Capacity (continued)(continued)
Possible Redesign of Possible Redesign of MagazineMagazine
– Clip holding 60-70 Clip holding 60-70 roundsrounds
– Circular or box shaped Circular or box shaped magazine instead of magazine instead of linearlinear
![Page 13: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/13.jpg)
Target SightingTarget Sighting
Sighting AccuracySighting Accuracy
– Difficult to aimDifficult to aim
![Page 14: Human Factors Problems](https://reader035.vdocuments.us/reader035/viewer/2022062814/568167d6550346895ddd2dc2/html5/thumbnails/14.jpg)