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MX-81 Hypersonic Operations Aircraft

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7644 MX-81 Hypersonic Operations Aircraft

772 pieces in 188 part and color combinations, plus 5 minifigures.

The official piece count includes the 23 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Plates 99 pieces

  • Plate 1 x 10 Black Part 4477 Element 447726 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×5
  • Plate 2 x 12 Black Part 2445 Element 244526 ×9
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×1
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 4 x 10 Black Part 3030 Element 303076 or 303026 ×1
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×6
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×11
  • Plate 1 x 8 Blue Part 3460 Element 346023 ×5
  • Plate 2 x 8 Blue Part 3034 Element 303423 ×8
  • Plate 4 x 4 Blue Part 3031 Element 4243815 or 303123 ×4
  • Plate 1 x 6 Dark Bluish Gray Part 3666 Element 4211056 ×1
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×1
  • Plate 2 x 2 Orange Part 3022 Element 4613982 or 4159007 ×2
  • Plate 2 x 4 Orange Part 3020 Element 4158355 or 4122468 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×13
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×4
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×9
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×4
  • Plate 4 x 6 White Part 3032 Element 303201 ×3
  • Plate 6 x 6 White Part 3958 Element 6552116 or 4144012 ×1

Technic Pins 98 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 3 spares in the box ×30
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 9 spares in the box ×8
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 4 spares in the box ×24
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×8
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×14
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×2
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×12

Bricks Round and Cones 60 pieces

  • Brick Round Corner 10 x 10 with Slope 33° Edge, Axle Hole, Facet Cutout Black Part 58846 Element 6454174 or 6015466 ×2
  • Cone 2 x 2 x 2, Open Stud Black Part 3942c Element 6092664 or 6022160 ×2
  • Brick Round 1 x 1 Open Stud Dark Bluish Gray Part 3062b Element 4211090 ×10
  • Brick Round 2 x 2 with Axle Hole Lime Part 3941 Element 4527943 or 4279733 ×6
  • Brick Round 2 x 2 x 1 2/3 Dome Top, Blocked Open Stud Trans-Clear Part 30151a Element 4113949 ×2
  • Brick Round 1 x 1 Open Stud Trans-Dark Blue Part 3062b Element 6514233 or 6238044 ×18
  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×7
  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×4
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×5
  • Cone 2 x 2 x 2, Open Stud White Part 3942c Element 6044601 or 6022158 ×2
  • Cylinder 3 x 6 x 2 2/3 Horizontal Hollow Studs White Part 30360 Element 4215142 or 4142999 ×2

Technic Bricks 58 pieces

  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×2
  • Technic Brick 1 x 14 [13 Pin Holes] Black Part 32018 Element 4107558 ×8
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×6
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×25
  • Technic Brick 6 x 8 with 4 x 6 Opening Black Part 32532 Element 6448394 or 4188143 ×1
  • Technic Brick 1 x 2 [2 Pin Holes] Dark Bluish Gray Part 32000 Element 4210762 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Red Part 32064b ×2
  • Technic Brick 1 x 16 [15 Pin Holes] White Part 3703 Element 4508661 or 370301 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] White Part 32064b ×6

Plates Round Curved and Dishes 51 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×2
  • Plate Round 1 x 1 with Solid Stud Lime Part 6141 Element 4183133 1 spare in the box ×7
  • Plate Round Corner 4 x 4 Lime Part 30565 Element 4504705 ×2
  • Plate Round 1 x 1 with Solid Stud Orange Part 6141 Element 4157103 3 spares in the box ×32
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Red Part 2654 Element 4617080 or 4278275 ×1
  • Dish 2 x 2 Inverted [Radar] Trans-Dark Blue Part 4740 Element 6580383 or 6398233 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Dark Blue Part 2654 Element 6581774 or 6171732 ×1
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 2 spares in the box ×3

Tiles Special 49 pieces

  • Tile Special 2 x 3 with 2 Clips [Thick Open O Clips] Black Part 30350b Element 4297713 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×27
  • Tile Special 1 x 2 with Handle Red Part 2432 Element 243221 ×1
  • Tile Special 2 x 2 with Top Pin Red Part 2460 Element 246021 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Trans-Red Part 2412b Element 6250158 or 4190187 ×8
  • Tile Special 1 x 1 with Clip and Straight Tips White Part 2555 Element 255501 ×2
  • Tile Special 1 x 2 with Handle White Part 2432 Element 243201 ×7

Bricks 40 pieces

  • Brick 1 x 8 Black Part 3008 Element 300826 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×8
  • Brick 2 x 6 Blue Part 2456 Element 4181139 or 245623 ×2
  • Brick 1 x 4 Dark Bluish Gray Part 3010 Element 4211103 ×2
  • Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×6
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×1
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×4
  • Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×2
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×4
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×9

Bricks Curved 39 pieces

  • Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×6
  • Brick Curved 6 x 1 Black Part 42022 Element 4160393 ×4
  • Brick Curved Inverted 6 x 1 Black Part 42023 Element 6112323 or 4160409 ×6
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Light Bluish Gray Part 47457 Element 4494475 ×5
  • Brick Curved 2 x 2 with Lip, No Studs White Part 30602 Element 4195869 ×3
  • Brick Curved 2 x 4 x 2/3 No Studs, with Bottom Tubes White Part 88930 Element 6552135 or 4583297 ×1
  • Brick Curved 4 x 1 No Studs [Stud Holder with Asymmetric Ridges] White Part 61678 ×14

Bricks Sloped 36 pieces

  • Brick Sloped 2 x 2 No Studs, with 3 Side Pistons Raised Edges Black Part 30603 Element 4163524 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
  • Brick Sloped 45° 2 x 4 Black Part 3037 Element 303726 ×1
  • Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Black Part 3678b Element 4273703 or 4256421 ×2
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Black Part 3747b Element 4500458 or 374726 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×3
  • Brick Sloped Inverted 45° 6 x 4 Double with 4 x 4 Recessed Black Part 30283 Element 4119370 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Orange Part 54200 Element 6245265 or 4244369 1 spare in the box ×2
  • Brick Sloped 18° 4 x 2 White Part 30363 Element 4143000 ×4
  • Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×2
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×2
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin White Part 3747b Element 4500469 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×6

Tiles 30 pieces

  • Tile 1 x 6 with Groove Black Part 6636 Element 663626 ×8
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile 1 x 2 with Groove Lime Part 3069b Element 4500125 or 4164025 ×3
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×7
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×4
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×7

Bars, Ladders and Fences 28 pieces

  • Bar 1 x 8 with Brick 1 x 2 Curved Top End (Axle Holder Inside Small End) Black Part 30359b Element 4164067 ×6
  • Bar 1L with Clip Black Part 48729a Element 4272218 1 spare in the box ×1
  • Antenna 1 x 4 with Rounded Top White Part 3957a ×1
  • Bar 1 x 8 with Brick 1 x 2 Curved Top End (Axle Holder Inside Small End) White Part 30359b Element 4529158 or 4222342 ×16
  • Lever Small Base with Black Lever White Part 298c02 Element 73737 1 spare in the box ×4

Bricks Special 27 pieces

  • Brick Special 1 x 1 Studs on 4 Sides Black Part 4733 Element 473326 ×1
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×2
  • Brick Special 1 x 2 with Pin Blue Part 2458 Element 245823 ×2
  • Brick Special 1 x 2 with Vertical Clip [Thick U Clip] Dark Bluish Gray Part 30237a ×2
  • Brick Special 1 x 2 with 2 Pins, Round Pin Holes Light Bluish Gray Part 30526 Element 4211660 ×2
  • Brick Special 1 x 4 with 4 Studs on One Side Light Bluish Gray Part 30414 Element 4211636 ×6
  • Brick Special 1 x 2 with Grille White Part 2877 Element 6552093 or 287701 ×6
  • Brick Special 1 x 2 with Handle White Part 30236 Element 4140626 ×6

Plates Special 25 pieces

  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
  • Plate Special 1 x 2 with Clips Horizontal [Thick U-Clips] Black Part 60470a Element 4537901 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Dark Bluish Gray Part 3794a ×5
  • Plate Special 2 x 2 with Wheels Holder Wide - Technic Pins Light Bluish Gray Part 47720 Element 4529120 or 4219243 ×2
  • Technic Plate 2 x 4 [3 Holes] Light Bluish Gray Part 3709 Element 4211444 ×5
  • Plate Special 1 x 2 Side Handle [Free Ends] Orange Part 2540 Element 4190164 or 4163269 ×4
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] White Part 6019 Element 601951 or 601901 ×2
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] White Part 2444 Element 244401 ×1
  • Plate Special 4 x 4, Studs on One Edge Plain] White Part 6179 Element 6550149 or 617901 ×2

Hinges, Arms and Turntables 24 pieces

  • Hinge 1 x 3 Triangle with Two Pins, 1 Locking Finger, Round Pin Holes Dark Bluish Gray Part 47973 Element 6078262 or 6021026 ×1
  • Hinge Brick 1 x 2 Base Light Bluish Gray Part 3937 Element 4211469 ×10
  • Hinge Brick 2 x 2 Locking with 2 Fingers Vertical and Axle Hole, 9 Teeth Light Bluish Gray Part 40902 Element 6093870 or 4215971 ×1
  • Hinge Brick 2 x 2 Top Plate Thin Light Bluish Gray Part 6134 Element 4211881 ×1
  • Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 Fingers Trans-Red Part 44572 Element 4508663 or 4226965 ×1
  • Hinge Brick 1 x 2 Top Plate Thin White Part 3938 Element 393801 ×9
  • Hinge Tile 1 x 4 Locking Dual 1 Fingers on Top [4 Locking Ridges] White Part 44822 Element 4609878 or 4529170 ×1

Technic Connectors 15 pieces

  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×6
  • Technic Axle and Pin Connector Angled #3 - 157.5° Red Part 32016 Element 6261396 or 6176754 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole White Part 32184 Element 6276981 or 6114940 ×1
  • Technic Pin Connector Round [Slotted] White Part 62462 Element 6550164 or 6173116 ×6

Technic Beams 13 pieces

  • Technic Beam 1 x 15 Thick Black Part 32278 Element 4542573 or 4128603 ×9
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×2
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×2

Technic Axles 12 pieces

  • Technic Axle 12 Black Part 3708 Element 370826 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×1
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×2
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×1
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×3
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×2
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×1

Bricks Wedged 10 pieces

  • Brick Wedged, Angled 3 x 2 Left Black Part 6565 Element 4527766 or 656526 ×1
  • Brick Wedged, Angled 3 x 2 Right Black Part 6564 Element 4526931 or 656426 ×1
  • Brick Wedged, Curved 16 x 4 Triple with Inner Ridges Black Part 45301 Element 4200486 ×1
  • Brick Wedged, Curved Inverted 10 x 6 x 2 Cockpit Black Part 47406 Element 4209683 ×2
  • Brick Wedged, Curved 10 x 3 Left White Part 50955 Element 6552138 or 6015474 ×1
  • Brick Wedged, Curved 10 x 3 Right White Part 50956 Element 6552139 or 6015477 ×1
  • Brick Wedged, Curved 6 x 2 Left, Inner Ridges White Part 41748 Element 6552117 or 4160124 ×1
  • Brick Wedged, Curved 6 x 2 Right, Inner Ridges White Part 41747 Element 4160101 ×1
  • Brick Wedged, Curved 6 x 4 Triple White Part 43712 Element 4179869 ×1

Tiles Round and Curved 6 pieces

  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×6

Minifig Accessories 5 pieces

  • Equipment Radio [Extended Handle, Compact Speaker Grille] Black Part 3962b Element 396226 ×1
  • Equipment Space Binoculars / Scanner / Electrobinoculars Dark Bluish Gray Part 30304 Element 6359935 or 4211124 ×1
  • Equipment Goblet / Glass Light Bluish Gray Part 2343 Element 4261919 ×2
  • Equipment Martian Hypersled with Pin (Mars Mission) White Part 58843 Element 4501924 ×1

Panels 5 pieces

  • Panel 1 x 4 x 1 with Rounded Corners [Thick Wall] Black Part 43337 Element 4239147 or 4233256 ×1
  • Panel 3 x 4 x 6 Curved Top White Part 2571 Element 6369855 or 6244791 ×4

Transportation - Sea and Air 5 pieces

  • Wing Plate 20 x 56 with 6 x 10 Opening White Part 54093 Element 4284004 ×1
  • Wing, Tail 4 x 1 x 3 White Part 2340 Element 6347936 or 234024 ×4

Rock 4 pieces

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Neon Green Part 30153 Element 6247790 or 4114505 ×4

Technic Panels 4 pieces

  • Technic Engine Block Half / Side Intake Panel White Part 61069 Element 4529162 ×4

Tubes and Hoses 4 pieces

  • Flexible Ribbed Hose 8mm Ends 19L Black Part 57539 Element 4561467 or 4504612 ×2
  • Flexible Ribbed Hose 8mm Ends 19L Orange Part 57539 Element 4561469 or 4508092 ×2

Wheels and Tyres 4 pieces

  • Wheel Hard Plastic Small (22mm D. x 24mm) Orange Part 6118 Element 4505861 ×4

Transportation - Land 3 pieces

  • Wheel Arch, Curved Wedge 4 x 3 with 2 x 2 Opening and 4 Studs Orange Part 47755 Element 6063272 or 4500337 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel White Part 3829c01 Element 4208543 or 9551 ×1

Windscreens and Fuselage 3 pieces

  • Windscreen 10 x 6 x 2 Curved Trans-Orange Part 45705 Element 6507926 or 6386002 ×2
  • Windscreen 10 x 6 x 2 Curved White Part 45705 Element 4521148 or 4503530 ×1

Containers 2 pieces

  • Box 2 x 2 x 2 [Hollow Studs] Trans-Neon Green Part 4345b Element 4291632 or 4107506 ×1
  • Box 2 x 2 x 2 Door with Slot White Part 4346 Element 434601 ×1

Minifig Shields, Weapons, & Tools 2 pieces

  • Weapon Gun / Torch (Space) [with Grooves] Light Bluish Gray Part 3959 Element 4295570 or 4261357 ×2

Projectiles / Launchers 2 pieces

  • Launcher, Technic Competition Cannon Flat Bottom [Complete Assembly] Dark Bluish Gray Part 57796 Element 6064131 or 4518308 ×1
  • Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Black Rubber End Light Bluish Gray Part 57028c01 Element 4299625 ×1

Stickers 2 pieces

  • Sticker Sheet 1 for Set 7644-1 [No Color/Any Color] Part 63091 Element 4527609 ×1
  • Sticker Sheet 2 for Set 7644-1 [No Color/Any Color] Part 63430 Element 4529037 ×1

Technic Bushes 2 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×2

Flags, Banners and Signs 1 piece

  • Flag 5 x 6 Hexagonal with C Clips White Part 51000 Element 4244959 ×1

Large Buildable Figures 1 piece

  • Large Figure Weapon Spear, Drill with Axle and Hole Black Part 40340 Element 4507190 or 4227078 ×1

Minifig Heads 1 piece

  • Minifig Head [Plain] [Blocked Open Stud] White Part 3626b ×1

String, Bands and Reels 1 piece

  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×1

Technic Special 1 piece

  • Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin Holes Trans-Orange Part 58947 Element 4502233 ×1

Minifigures 5 figures

  • Martian, Alien Commander Minifigure, checked as a whole figure ×1
  • Martian Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Cheek Lines Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Orange Sunglasses, Stubble Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Stubble Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

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