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.

Checking

42052 Heavy Lift Helicopter

1,042 pieces in 141 part and color combinations.

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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. Compare each color with the step's parts callout, especially White against Trans-Clear.
The spare pieces. This set comes with 17 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Piece checklist

Technic Bushes 21 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×9
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×12

Wheels and Tyres 17 pieces

Tyre 30.4 x 14 VR Solid Black Part 58090 Element 6601610 or 4550937 ×2
Tyre Offset Tread with Center Band 23 x 7 Black Part 61254 Element 4541455 ×2
Technic Wedge Belt Wheel [aka Pulley] Dark Bluish Gray Part 4185 Element 6321744 or 4587275 ×4
Wheel 31 x 15 Technic, 7 Pin Holes Dark Bluish Gray Part 60208 Element 4549886 ×5
Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55981 Element 6109684 or 4299119 ×2
Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring Light Bluish Gray Part 13971 Element 6359807 or 6044729 ×2

Technic Special 10 pieces

Technic Rotor Blade 31L with Beam 3L with Black Rubber Tip Dark Bluish Gray Part 99013pat0001 Element 6170508 or 6129007 ×6
Technic Disc 3 x 3 Light Bluish Gray Part 2723 Element 4667578 ×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Orange Part 41669 Element 4281515 or 4175219 ×1
Technic Changeover Catch - + opening Red Part 6641 Element 6099696 or 4270473 ×2

Plates Round Curved and Dishes 6 pieces

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Bluish Gray Part 4032a Element 4211042 ×4
Plate Round 4 x 4 with Pin Hole Light Bluish Gray Part 60474 Element 4515351 ×2

Tiles Round and Curved 6 pieces

Tile Round 1 x 1 with Gauge and Red Pointer Print Flat Silver Part 98138pr0012 Element 6287877 or 6030333 1 spare in the box ×2
Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 1 spare in the box ×2
Tile Round 1 x 1 Trans-Green Part 98138 Element 6514194 or 6274742 1 spare in the box ×1
Tile Round 1 x 1 Trans-Red Part 98138 Element 6514189 or 6258607 1 spare in the box ×1

Technic Steering, Suspension and Engine 4 pieces

Technic Link 1 x 9 Black Part 32293 Element 6244698 or 4141300 ×1
Technic Steering Wheel Small (3 Studs Diameter) Light Bluish Gray Part 2819 Element 4580510 or 4211578 ×1
Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×2

Bars, Ladders and Fences 3 pieces

Bar 3L Black Part 87994 Element 6185316 or 6093525 1 spare in the box ×1
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Trans-Red Part 58176 Element 6507867 or 6171762 ×2

Technic Beams Special 3 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced Light Bluish Gray Part 33299b Element 4563045 ×1
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×2

Tubes and Hoses 3 pieces

Axle Hose, Soft 19L Black Part 32235 Element 6139205 or 4121650 1 spare in the box ×1
Hose Rigid 3mm D. 6L / 4.8cm Black Part 75c06 Element 4640742 or 4546459 1 spare in the box ×2

Bricks Round and Cones 2 pieces

Brick Round 2 x 2 Dome Top, Hollow Stud Orange Part 30367c Element 4532970 or 4125257 ×2

Electronics 2 pieces

Battery Box, Power Functions 4 x 11 x 7 with Orange Switch and Dark Bluish Gray Covers [Complete Assembly] [New Version] Light Bluish Gray Part 16511 Element 6368436 or 6257768 ×1
Motor, Medium, Power Functions, 3 x 6 x 3 with Dark Bluish Gray Bottom and 20cm Wire Light Bluish Gray Part 58120 Element 6209881 or 6151440 ×1

Plates Special 2 pieces

Plate Special 3 x 4 with 1 x 4 Center Studs [Plain] Light Bluish Gray Part 88646 Element 6122124 or 6079461 ×1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Yellow Part 15573 Element 6092583 ×1

String, Bands and Reels 2 pieces

String Cord Thin (0.5mm) 50cm Black Part 56823c50 Element 6530026 or 6489925 ×1
Technic Reel 3 x 2 Dark Bluish Gray Part 32012 Element 32012199 or 4239891 ×1

Tiles 2 pieces

Tile 2 x 2 with Groove Dark Bluish Gray Part 3068b Element 4211055 ×2

Transportation - Land 2 pieces

Tipper Drum 3 x 6 x 10 Cement Mixer Half with 4 Technic Pin Holes White Part 57792 Element 6139303 or 6036879 ×2

Stickers 1 piece

Sticker Sheet for Set 42052-1 [No Color/Any Color] Part 25692 Element 6142231 ×1

Supports, Girders and Cranes 1 piece

Hook with Towball Dark Bluish Gray Part 30395 Element 30395199 or 6347464 ×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.

LEGO Missing Piece Checker

42052 Heavy Lift Helicopter

Before you call it missing

Your missing list

Piece checklist

Technic Pins 424 pieces

Technic Beams 173 pieces

Technic Connectors 163 pieces

Technic Axles 109 pieces

Technic Panels 51 pieces