BlockTalk Find Your Set

Free tool

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.

Airport Action

Checking

7840 Airport Action

105 pieces in 65 part and color combinations.

LEGO counts 103 pieces. This inventory comes from a separate parts catalog and lists 105; the two do not always count the same elements, so their totals differ. 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Show

Piece checklist

Pearl Light Gray 20 pieces

  • Duplo Airplane Large Engine Pearl Light Gray Part 52923 Element 4264946 ×3
  • Duplo Elevator / Lift 2 x 4 x 2 Pearl Light Gray Part 44700 Element 4268491 ×1
  • Duplo Flagpole / Antenna 1 x 9 Pearl Light Gray Part 51708 Element 4585938 or 4281431 ×2
  • Duplo Forklift Plate Pearl Light Gray Part 42405 Element 4264439 ×1
  • Duplo Hose 11L with Stud Holder and Black Hose Pearl Light Gray Part 6426c01 Element 4283591 ×1
  • Duplo Loading Pallet 4 x 4 Indented Side Pearl Light Gray Part 47415 Element 4265610 ×2
  • Duplo Siren / Flashing Light - Trans-Dark Blue Pearl Light Gray Part 2318c01 Element 4558264 or 4519403 ×2
  • Duplo Suitcase Pearl Light Gray Part 6427 Element 4157602 ×3
  • Duplo Telephone, Mobile with Keypad with Numbers and Display of Man Print Pearl Light Gray Part 51289pr0002 Element 4267916 ×1
  • Duplo Video Camera Pearl Light Gray Part 6504 Element 4281182 or 4223367 ×1
  • Duplo Winch Drum Narrow High with White String and Black Hook with Stud Case Pearl Light Gray Part 46321c02 Element 4560387 ×1
  • Duplo Wrench Pearl Light Gray Part 47509 Element 4281735 or 4207545 ×2

White 14 pieces

  • Duplo Airplane / Jetliner Wings 4 x 16 x 1/2 White Part 2155 Element 4264440 ×1
  • Duplo Airplane Front Door White Part 52918 Element 4264940 ×1
  • Duplo Airplane Fuselage 14 x 30 x 5 White Part 53308 Element 4271617 or 4267975 ×1
  • Duplo Airplane Large Cargo Door White Part 52919 Element 4264939 ×1
  • Duplo Airplane Large Roof 5 x 16 White Part 52914 Element 4264953 ×1
  • Duplo Airplane Large Wings 30 x 6 White Part 52920 Element 4264959 ×1
  • Duplo Brick 2 x 2 Slope 45° White Part 6474 Element 6171868 or 4255342 ×1
  • Duplo Figure with Police Style Hat Black, with White Top with Airplane Logo and Black Tie, Sunglasses, Black Legs White Part 98465pr0005 ×1
  • Duplo Panel 1 x 2 x 1 2/3 Sloped with 3 Embossed Gauges White Part 6428 Element 4264409 ×1
  • Duplo Plate 2 x 4 White Part 40666 Element 4250172 or 4160151 ×4
  • Duplo Truck Pickup Flatbed with Yellow Base with Lego Logo on Front Print White Part 47440c02pr0001 Element 4265254 ×1

Black 13 pieces

  • Duplo Brick 1 x 2 x 2 with Side Cutouts and Channel in Top Black Part 42234 Element 4249892 ×1
  • Duplo Brick 2 x 2 Black Part 3437 Element 4583790 or 343726 Also in Dark Blue ×7
  • Duplo Lamp Post Black Part 42083 Element 4233395 ×1
  • Duplo Plate 2 x 2 with Tow Rope Holder Arms Black Part 42026 Element 4186569 or 4162964 ×1
  • Duplo Plate 8 x 8 Black Part 51262 Element 4246955 ×1
  • Duplo Radar Array Black Part 4376 Element 4264448 ×1
  • Duplo Support 2 x 3 x 3 with 2 Top Studs Black Part 41969 Element 4162956 ×1

Dark Blue 13 pieces

  • Duplo Airplane Large Engine Housing Dark Blue Part 52922 Element 4264945 ×3
  • Duplo Airplane Large Tail Fin 1 x 9 x 5 Dark Blue Part 53491 Element 4271605 ×1
  • Duplo Brick 2 x 2 Dark Blue Part 3437 Element 6528033 or 4254992 Also in Black ×1
  • Duplo Chair with 1 Stud Dark Blue Part 4885 Element 4264805 ×3
  • Duplo Figure with Headset and Cap Yellow, with Dark Blue Arms, and Legs, Yellow Knee Pads Print, and Yellow Vest with ID Badge and Radio, Open Mouth Print Dark Blue Part 10111pr0004 ×2
  • Duplo Flag 2 x 5 with White Airplane in Circle on Both Sides Print Dark Blue Part 51725pr0003 ×2
  • Duplo Sign Post Short Dark Blue Part 4375 Element 4222128 ×1

Yellow 10 pieces

  • Duplo Brick 2 x 2 Yellow Part 3437 Element 4583546 or 343724 ×4
  • Duplo Brick 2 x 2 with Black and Yellow Danger Stripes Print Yellow Part 3437pr0008 Element 4269450 ×2
  • Duplo Brick 2 x 2 x 2 Yellow Part 31110 Element 4566620 or 4107911 ×2
  • Duplo Door 1 x 4 x 4 with Four Panes Yellow Part 2205 Element 4264414 or 4129957 ×1
  • Duplo Forklift Truck with Two Large Front Black Wheels and Two Small Rear Black Wheels Yellow Part 42404c01 Element 4534372 or 4265224 ×1

Light Bluish Gray 9 pieces

  • Duplo Airplane Landing Gear with Four Wheels Light Bluish Gray Part 53142 Element 4656328 or 4264995 ×2
  • Duplo Airplane Landing Gear with Two Wheels and Clip Light Bluish Gray Part 53143 Element 4656329 or 4616462 ×1
  • Duplo Container Box 4 x 4 with Studs on Corners Light Bluish Gray Part 47423 Element 4262120 ×1
  • Duplo Plate 2 x 4 with Two Holes Light Bluish Gray Part 52924 Element 4621293 or 4264941 ×3
  • Duplo Support Brick 2 x 4 x 3 Light Bluish Gray Part 4537 Element 4264407 ×2

Orange 9 pieces

  • Duplo Brick 2 x 2 Orange Part 3437 Element 4159527 ×1
  • Duplo Cone 2 x 2 Square Base with White Reflective Safety Stripes Print Orange Part 47408pr0001 Element 6019741 or 4285308 ×3
  • Duplo Fence / Rail 1 x 6 with 5 Rails Orange Part 2214 Element 4261686 ×3
  • Duplo Flashlight, 2 x 2 Base with Trans-Neon Orange Light Orange Part 41195c01 Element 4222134 ×1
  • Duplo Sign Post Short Orange Part 4375 Element 4264444 ×1

Dark Bluish Gray 6 pieces

  • Duplo Baseplate 8 x 12 Dark Bluish Gray Part 31043 Element 4265232 ×1
  • Duplo Brick 2 x 2 x 2 Dark Bluish Gray Part 31110 Element 4210954 ×4
  • Duplo Building Door Frame / Entryway 4 x 4 x 5 Dark Bluish Gray Part 6360 Element 4264411 ×1

Red 3 pieces

  • Duplo Brick 1 x 3 x 2 Triangle Red Part 42025 Element 4162963 ×1
  • Duplo Figure Side Parted Hair Black, Dark Blue Legs, Open Shirt with 'VIP' Badge Print Red Part 75126pr0011 ×1
  • Duplo Wave (Fire, Water, Flame) 2 x 1 x 5 with Marbled Bright Light Orange Tip Red Part 51703pr0001 ×1

Tan 2 pieces

  • Duplo Brick 1 x 2 x 2 with Tied Parcel and Postmark Print Tan Part 4066pr0171 Element 4213777 ×2

[No Color/Any Color] 2 pieces

  • Playmat, Duplo, Airport Runway Print [No Color/Any Color] Part 53397 Element 4269747 ×1
  • Sticker Sheet for Set 7840-1 [No Color/Any Color] Part 53298 Element 4267921 ×1

Bright Light Blue 1 piece

  • Duplo Figure with Parted Wavy Hair Reddish Brown, Dark Blue Legs, Shirt with ID Badge, Pocket, and Red Tie, Beard and Glasses Print Bright Light Blue Part 75115pr0005 ×1

Dark Green 1 piece

  • Duplo Fuel Container 1 x 2 x 2 Dark Green Part 45141 Element 4222130 ×1

Medium Blue 1 piece

  • Duplo Brick 2 x 2 Medium Blue Part 3437 Element 4166960 or 4162701 ×1

Trans-Brown 1 piece

  • Duplo Airport Tower Glass Enclosure Trans-Brown Part 6361 Element 4261681 ×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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy