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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Level Two - Kit 4, Flight Designer

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20203 Level Two - Kit 4, Flight Designer

145 pieces in 61 part and color combinations, plus 1 minifigure.

The official piece count includes the 5 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

Light Bluish Gray 34 pieces

  • Hinge Brick 1 x 2 Base Light Bluish Gray Part 3937 Element 4211469 ×2
  • Plate 1 x 12 Light Bluish Gray Part 60479 Element 4514846 ×2
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×5
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×4
  • Plate 2 x 6 Light Bluish Gray Part 3795 Element 4211452 or 3795194 ×5
  • Plate 4 x 8 Light Bluish Gray Part 3035 Element 4211407 ×1
  • Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×2
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 ×1
  • Wedge Plate 12 x 3 Left Light Bluish Gray Part 47397 Element 4208988 ×2
  • Wedge Plate 12 x 3 Right Light Bluish Gray Part 47398 Element 4209006 ×2
  • Wedge Plate 4 x 4 Cut Corner Light Bluish Gray Part 30503 Element 4160560 ×2
  • Wedge Plate 6 x 3 Left Light Bluish Gray Part 54384 Element 4282789 ×2
  • Wedge Plate 6 x 3 Right Light Bluish Gray Part 54383 Element 4282786 ×2
  • Wheel Holder 2 x 2 Thin with Split Wheel Clip Pins Light Bluish Gray Part 4870 Element 6510631 or 6296797 ×2

Yellow 25 pieces

  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×1
  • Brick Curved 2 x 4 x 1 1/3 Yellow Part 6081 Element 6388489 or 4204625 ×2
  • Brick Curved 4 x 1 No Studs [Stud Holder with Asymmetric Ridges] Yellow Part 61678 Element 4522035 ×4
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×4
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×4
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×1
  • Tile Special 1 x 1 with Clip with Rounded Tips Yellow Part 12825 Element 6030719 ×1
  • Wedge Plate 3 x 2 Left Yellow Part 43723 Element 4179095 ×2
  • Wedge Plate 3 x 2 Right Yellow Part 43722 Element 4179094 ×2
  • Wedge Plate 8 x 3, 22° Left Yellow Part 50305 Element 6307260 or 4247644 ×1
  • Wedge Plate 8 x 3, 22° Right Yellow Part 50304 Element 6307262 or 4247642 ×1

Black 23 pieces

  • Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×2
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Black Part 73983 Element 6102782 or 74011 ×4
  • Plate 1 x 1 Black Part 3024 Element 302426 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×5
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Propeller 3 Blades 5 Diameter, Pin Hole Black Part 92842 Element 6360206 or 4599984 ×2
  • Tap 1 x 1 without Hole in Spout Black Part 4599b Element 459926 ×1
  • Tile Special 2 x 2 with Top Pin Black Part 2460 Element 4258354 or 246026 ×1
  • Tyre 14 x 4 Smooth Small Single Black Part 3139 Element 313926 ×4

White 23 pieces

  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×2
  • Brick Curved 6 x 1 White Part 42022 Element 4160387 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×1
  • Brick Sloped Inverted 45° 6 x 1 Double with 1 x 4 Recessed White Part 52501 Element 4259937 ×1
  • Hinge Brick 1 x 2 Top Plate Thin White Part 3938 Element 393801 ×2
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×4
  • Steering Stand 1 x 2 with Black Steering Wheel White Part 3829c01 Element 4208543 or 9551 ×1
  • Wheel 8 x 6 White Part 4624 Element 462401 ×4
  • Wing, Tail 4 x 1 x 3 White Part 2340 Element 6347936 or 234024 ×2

Dark Red 15 pieces

  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Dark Red Part 6091 Element 6411330 or 4539082 ×4
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Red Part 54200 Element 4539079 or 4531415 ×6
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Red Part 3040b Element 4541526 or 4209500 ×2
  • Tile 1 x 4 with Groove Dark Red Part 2431 Element 4539060 or 4164220 ×3

Orange 12 pieces

  • Brick 1 x 2 Orange Part 3004 Element 4613981 or 4121739 ×2
  • Plate Round 1 x 1 with Solid Stud Orange Part 6141 Element 4157103 ×6
  • Tile 2 x 2 with Groove Orange Part 3068b Element 4542142 or 4125268 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×2

Metallic Silver 5 pieces

  • Engine / Air Scoop 2 x 2 Metallic Silver Part 50943 Element 6051377 or 4579841 ×1
  • Plate Round 1 x 1 with Solid Stud Metallic Silver Part 6141 Element 51809301 or 6546105 ×4

Trans-Green 2 pieces

  • Tile 1 x 1 with Groove Trans-Green Part 3070b Element 6581818 or 6254249 ×2

Trans-Red 2 pieces

  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 ×2

Dark Bluish Gray 1 piece

  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Dark Bluish Gray Part 3794b Element 4211119 ×1

Flat Silver 1 piece

  • Plate Special 1 x 4 with Angled Tubes Flat Silver Part 61072 Element 4632100 ×1

Trans-Brown 1 piece

  • Panel 1 x 2 x 1 [Square Corners] Trans-Brown Part 4865a Element 4200798 ×1

Trans-Clear 1 piece

  • Windscreen 7 x 4 x 2 Round with Handle Trans-Clear Part 92279 Element 6514171 or 6245241 ×1

Minifigures 1 figure

  • MBA Level Two Minifigure, checked as a whole figure ×1

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

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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