Unit Load Device ULD Air Container Specifications

Download the specifications of ULD containers that are used to securely transport air cargo all over the world.

What are Unit Load Device (ULD) Air Containers?

A Unit Load Device (known as ULDs) are specially designed cargo pallets and containers that are used to load freight, luggage and mail onto aircraft. These devices allow large quantities of cargo to be bundled and strapped together securely onto 1 mobile unit, so they can safely and securely transported.

The International Air Transport Association (IATA) is responsible for publishing regulations around the use of Unit Load Devices. They can also be referred to as a cargo pallet or a PMC pallet.

ULDs come in 2 forms – Containers and pallets.

ULD containers and pallets

Download Specifications Chart of Unit Load Devices

Unit Load Device Air Container specifications
Download ULD Specifications Chart

The following images and specifications illustrates the average external dimensions and weight limitations of popular ULDs.  These images are to be used as a guide only. Please note that the exact weight limitations and dimensions will vary by manufacturer.

LD-1 Unit Load Device

  • IATA ULD code: AKC contoured container
  • Prefixes: AVC, AVD, AVK, AVJ, and forkable AVY
  • Rate class: Type 8
  • Description: Half-width lower hold container with one angled side. Door is either canvas or solid.
  • Loadability: 747, 767, 777, 787, MD-11 lower hold
  • Door opening: 147 x 155 cm (58 x 61 in)
  • Maximum gross weight: 1,588 kg (3,501 lb)
  • Tare weight: 70 to 170 kg (155 to 375 lb)
  • AS1825 volume: 5.0 m3(175 ft3)

LD-2 Unit Load Device

ULD LD-2 Air Container
  • IATA ULD code: DPE contoured container
  • Prefixes: APA, DPA, and forkable DPN
  • Rate class: Type 8D
  • Description: Half-width lower hold container with one angled side. Door is either canvas or solid.
  • Suitable for: 747, 767, 777, 787 lower hold
  • Door opening: 44 x 60-in (112 x 152-cm)
  • Maximum gross weight: 1,225 kg (2,700 lb)
  • Tare weight: 92 kg (203 lb)
  • AS1825 volume: 3.5 m3 (124 ft3)
  • Boeing volume: 3.5 m3 (124 ft3)

LD-3 Unit Load Device

ULD LD-3 Air Container

  • IATA ULD code: AKE contoured container
  • Prefixes: AKE, AVA, AVB, AVC, AVK, DVA, DVE, DVP, XKS, XKG, and forkable AKN, AVN, DKN, DVN, and XKN
  • Rate class: Type 8
  • Description: Half-width lower deck container with one angled side. Door is either canvas or solid.
  • Loadability: A300, A310, A330, A340, 747, 767, 777, DC-10, MD-11, and L-1011
  • Door opening: 58 x 61 in (147 x 155 cm)
  • Maximum gross weight: 3,500 lb (1,588 cm)
  • Tare weight: 181 lb (82 kg)
  • AS1825 volume: 159 ft3 (4.5 m3)

LD-3 Reefer Unit Load Device

ULD LD-3 Reefer Air Container
  • IATA ULD code: RKN contoured cool container
  • Prefixes: RVN
  • Rate class: Type 8
  • Description: Half-width lower hold insulated container with one angled end. Door is solid. Most examples are forkable.
  • Suitable for: 747, 767, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 54 x 55-in
  • Maximum gross weight: 1,588 cm (3,500 lb)
  • Tare weight: 210 kg (463 lb)
  • AS1825 volume: 4.5 m3 (159 ft3) plus internal volume (as is)

LD-4 Unit Load Device

ULD LD-4 Air Container
  • IATA ULD code: ALP rectangular container
  • Prefixes: ALD, AWD, AWZ, DLP, and forkable ALB, ALC, AWB, and AWC
  • Rate class: Type 8
  • Description: Full-width lower hold container. Door is canvas with built-in door straps.
  • Suitable for: 767, 777, 787 lower hold
  • Door opening: 92 x 61-in (234 x 155-cm)
  • Maximum gross weight: 2,449 kg (5,399 lb)
  • Tare weight: 120 kg (264 lb)
  • AS1825 volume: 5.7 m3 (200 ft3)
  • Boeing volume: 5.5 m3 (195 ft3)

LD-6 Unit Load Device

ULD LD-6 Air Container
  • IATA ULD code: ALF contoured container
  • Prefixes: AWA, AWF, and forkable AWC
  • Rate class: Type 6W
  • Description: With built-in door straps.
  • Suitable for: 747, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 120 x 60-in (305 x 152-cm)
  • Maximum gross weight: 3,175 kg (7,000 lb)
  • Tare weight: 230 kg (507 lb)
  • AS1825 volume: 9.1 m3 (322 ft3)
  • Boeing volume: 8.9 m3 (316 ft3)

LD-7 Unit Load Device

ULD LD-7 Air Container
  • IATA ULD code: P1P flat pallet with net
  • Prefixes: PAA, PAG, PAJ, PAP, PAX, P1A, P1C, P1D, and P1G
  • Rate class: Type 5
  • Description: Universal general-purpose flat pallet for lower holds and main decks.
  • Suitable for:   Widebody: All aircraft lower holds and main decks.   Standard-body: 707F, 727F, 737F, 757F, DC8F, DC9F main decks
  • Maximum gross weight: 4,626 kg (10,198 lb)
  • Tare weight: 105 kg (231 lb)
  • AS1825 volume: 10.5 m3 (370 ft3)
  • Boeing volume: 10.7 m3 (379 ft3)

LD-7 With Angled Wings Unit Load Device

ULD LD-7 with angled wings air container
  • IATA ULD code: XAW P1P pallet with fixed-angle wings and net
  • Rate class: Type 5
  • Description: P1P base with fixed wings for overhang.
  • Suitablefor: 747, 777, 787, DC-10, MD-11 lower holds
  • Maximum gross weight: 5,000 kg (11,023 lb)
  • Tare weight: 170 kg (375 lb)
  • AS1825 volume: 14.0 m3 (495 ft3)

LD-7 With Folding Wings Unit Load Device

ULD LD-7 with folding wings air container
  • IATA ULD code: PAD P1P pallet with folding wings and net
  • Prefixes: PAX and P1X
  • Rate class: Type 5
  • Description: P1P base with folding wings for overhang.
  • Suitable for: 747, 777, 787, DC-10, MD-11 lower holds
  • Maximum gross weight: 5,000 kg (11,023 lb)
  • Tare weight: 152 kg (335 lb)
  • AS1825 volume: 14.0 m3 (495 ft3)

LD-8 Unit Load Device

ULD LD-8 Air Container
  • IATA ULD code: DQF
  • Prefixes: ALE, ALN, DLE, DLF, DQP, and MQP
  • Rate class: Type 6A
  • Description: Full-width lower hold container angled at both ends. Door is canvas with built-in door straps.
  • Suitable for: 767, 787 lower hold
  • Door opening: 92 x 62-in (234 x 157-cm)
  • Maximum gross weight: 2,450 kg (5,401 lb)
  • Tare weight: 127 kg (280 lb)
  • AS1825 volume: 7.1 m3 (252 ft3)
  • Boeing volume: 6.9 m3 (245 ft3)

LD-9 Unit Load Device

ULD LD-9 Air Container
  • IATA ULD code: AAP enclosed pallet on P1P base
  • Rate class: Type 5
  • Description: General-purpose enclosed container fitted to P1P base. Door is canvas with built-in net door straps, or solid.
  • Suitable for: 747, 767, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 118 x 58 in (300 x 147-cm)
  • Maximum gross weight: Lower hold, 4,624 kg (10,194 lb); main deck, 6,000 kg (13,227 lb)
  • Tare weight: Canvas door, 215 kg (473 lb); solid door, 270 kg (595 lb)
  • AS1825 volume: 10.8 m3 (381 ft3)
  • Boeing volume: 10.8 m3 (381 ft3)

LD-9 Reefer Unit Load Device

ULD LD-9 Reefer Air Container
  • IATA ULD code: RAP cool container on P1P base
  • Rate class: Type 5
  • Description: Insulated container with solid door. Suitable for: 747, 767, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 85 x 58-in (216 x 147-cm)
  • Maximum gross weight: Lower hold, 4,626 kg (10,198 lb); main deck, 6,000 kg (13,227 lb)
  • Tare weight: 400 kg (882 lb)
  • Internal volume: 9.6 m3 (339 ft3)

LD-11 Unit Load Device

ULD LD-11 Air Container
  • IATA ULD code: ALP rectangular container
  • Prefixes: ALD, AW2, AWB, AWD, AWZ, DLP, DWB, and MWB. Refrigerated version: RWB, RWD, and RWZ.
  • Rate class: Type 6
  • Description: Full-width lower hold container. Door is canvas. Center post swings clear for loading. Refrigerated version has solid door.
  • Suitable for: 747, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 120 x 61-in (305 x 155-cm)
  • Maximum gross weight: 3,176 kg (7,002 lb)
  • Tare weight: 185 kg (408 lb)
  • AS1825 volume: 7.4 m3 (262 ft3)
  • Boeing volume: 7.2 m3 (256 ft3)

LD-26 Unit Load Device

ULD LD-26 Air Container
  • IATA ULD code AAF contoured container on P1P base
  • Rate class: Type 5
  • Description: Full-width lower hold container angled at both ends. Door is canvas with built-in net door straps.
  • Suitable for: 747, 777, 787, DC-10, MD-11 lower hold
  • Door opening: 120 x 60-in (305 x 152-cm)
  • Maximum gross weight: 6,033 kg (13,300 lb)
  • Tare weight: 250 kg (551 lb)
  • AS1825 volume: 13.3 m3 (470ft3) )

LD-29 Unit Load Device

ULD LD-29 Air Container
  • IATA ULD code AAU contoured container on P1P base
  • Rate class: Type 5
  • Description: Full-width lower hold container angled at both ends. Door is canvas with built-in net door straps.
  • Suitable for: 747 lower hold Door opening: 118 x 60-in (300 x 152-cm)
  • Maximum gross weight: 6,033 kg (13,300 lb)
  • Tare weight: 265 kg (584 lb)
  • AS1825 volume: 14.4 m3 (510 ft3)

LD-29 Reefer Unit Load Device

ULD LD-29 Reefer Air Container
  • IATA ULD code RAU contoured cool container on P1P base.
  • Rate class: Type 5
  • Description: Full-width lower hold container angled at both ends. Refrigerated version of AAU has solid door.
  • Suitable for: 747 lower hold
  • Door opening: 118 x 60-in (300 x 152-cm)
  • Maximum gross weight: 6,033 kg (13,300 lb)
  • Tare weight: 450 kg (992 lb)
  • Internal volume: 11.1 m3 (392 ft3)

LD-39 Unit Load Device

ULD LD-39 Air Container
  • IATA ULD code: AMU contoured container on P6P base
  • Rate class: Type 2BG
  • Description: Full-width lower hold container angled at both ends. Door is canvas with built-in net door straps.
  • Suitable for: 747 lower hold
  • Door opening: 120 x 60-in (305 x 152-cm)
  • Maximum gross weight: 5,035 kg (11,100 lb)
  • Tare weight: 290 kg (639 lb)
  • AS1825 volume: 15.9 m3 (560 ft3)

M-1 Unit Load Device

ULD M-1 Air Container
  • IATA ULD code: AMA rectangular container on P6P base
  • Prefixes: AMF, AMG, AMK, AMP, AQA, AQD, and AQ6
  • Rate class: Type 2
  • Description: Main-deck container. Door is canvas with built-in net door straps.
  • Suitable for: 747F, 747 Combi, 777F center loading only
  • Maximum gross weight: 6,804 cm (15,000 lb)
  • Tare weight: 350 kg (772 lb),
  • AS1825 volume: 17.6 m3 (623 ft3)

M-1H Unit Load Device

ULD M-1H Air Container
  • IATA ULD code: AMD contoured
  • Rate class: Type 2H
  • Description: Main-deck upper contoured container. Door is canvas with built-in net door straps.
  • Suitable for: 747F, 747 Combi777F center loading only
  • Maximum gross weight: 6,800 kg (14,491 lb)
  • Tare weight: 370 kg (816 lb)
  • AS1825 volume: 21.2 m3 (750 ft3)

M-2 Unit Load Device

ULD M-2 Air Container
  • IATA ULD code: AGA 20-ft box container
  • Prefixes: ASE
  • Rate class: Type 1
  • Description: Main-deck container. Door is solid. 
  • Suitable for: 747F, 747 Combi (243.8 cm) 777F center loading only 238.5 in
  • Maximum gross weight: 11,340 kg (25,000 lb)
  • Tare weight: 1,000 kg (2,204 lb)
  • AS1825 volume: 33.7 m3 (1,190 ft3)

M-6 Unit Load Device

ULD M-6 Air Container
  • IATA ULD code: PGA 20-ft flat pallet with net
  • Prefixes: PGA, PGE, PGF, PSA, PSG, P7E, P7F, and P7G
  • Rate class: Type 1 
  • Description: Main-deck pallet squared off to 244 cm (96 in) high.
  • Suitable for: 747F, 747 Combi, 777F 
  • Maximum gross weight: 11,340 kg (25,000 lb) (605.8 cm)
  • Tare weight: 500 kg (1,102 lb)
  • AS1825 volume: 33.7 m3 (1,190 ft3)

M-6 (118″H) Unit Load Device

ULD M-6 (118"H) Air Container
  • IATA ULD code: PGA 10-ft high, 20-ft flat pallet with net
  • Prefixes: PGA, PGE, PGF, PSA, PSG, P7A, P7E, P7F, and P7G
  • Rate class: Type 1 
  • Description:Main-deck pallet squared off to 299.7 cm (118 in) high.
  • Suitable for: 747 Combi, 777F 238.5 in 747F through side cargo door only
  • Maximum gross weight: 11,340 kg (25,000 lb)  
  • Tare weight: 500 kg (1,102 lb)
  • AS1825 volume: 39.6 m3 (1,400 ft3)

M-6 Twin Car Rack Unit Load Device

ULD M-6 Twin Car Rack Air Container
  • IATA ULD code: PRA 16-ft flat pallet with twin car racks as VRA
  • Prefixes: PMA, P4A, P4M, and PZA
  • Rate class: Type 1P
  • Description: Main-deck pallet with special moulding for car rack attachments. The support racks are available in pairs as IATA ULD code VRA.
  • Suitable for: 747F, 747 Combi, 777F (center loading only) Maximum gross weight: 8,900 kg (19,621 lb), vehicle for upper rack must not exceed 1,800 kg (3,968 lb)
  • Tare weight: 400 kg (882 lb)
  • Car supports weight: 130 kg (286 lb) per pair
  • Note: The same system is available for longer vehicles on 20-ft pallet. The only increase in weight is the pallet tare weight: 500 kg (1,102 lb).

MDP Unit Load Device

ULD MDP Air Container
  • IATA ULD code: PRA 16-ft pallet with net
  • Prefixes: PMA, P4A, P4M, and PZA
  • Rate class: Type 1P
  • Description: Main-deck pallet with net
  • Suitable for: 747F, 747 Combi, 777F
  • Maximum gross weight: 11,300 kg (24,911 lb)
  • Tare weight: 410 kg (904 lb)
  • AS1825 volume: 27.6 m3 (974 ft3)

PLA Half Pallet Unit Load Device

ULD PLA Half Pallet Air Container
  • IATA ULD code: PLA half pallet with net
  • Prefixes: PLB, FLA, P9A, P9B, P9P, P9R, and P9S
  • Rate class: Type 6
  • Description: Half pallet is contoured for lower hold and main deck.
  • Suitable for: 747, 777, 787 lower hold; 707F, 727F, 737F main deck with contoured load
  • Maximum gross weight: 3,175 kg (6,999 lb)
  • Tare weight: 91 kg (200 lb)
  • AS1825 volume: 7.1 m3 (250 ft3)

PMC/P6P Pallet Unit Load Device

ULD PMC/P6P Pallet Air Container
  • IATA ULD code: P6P 10-ft flat pallet with net
  • Rate class:Type 2BG
  • Description: Universal general-purpose flat pallet for lower holds and main decks.
  • Suitable for: 747, 767, 777, 787, DC-10, MD-11
  • Tare weight: 120 kg (265 lb)
  • AS1825 volume: H 162.6 cm H 243.8 cm H 299.7 cm H 162.2 cm H 243.8 cm H 299.7 cm
  • Boeing volume: (64 in), 11.5 m3 (407 ft3) (96 in), 17.0 m3 (600 ft3) (118 in), 21.2 m3 (750 ft3) (64 in), 11.7 m3 (415 ft3) (96 in), 17.0 m3 (600 ft3) (118 in), 21.2 m3 (750 ft3)

PNA Half Pallet Unit Load Device

ULD PNA Half Pallet Air Container
  • IATA ULD code: PNA 767 half pallet with net
  • Prefixes: PQP, FQF, and PPC
  • Rate class: Type 8
  • Description: Half pallet squared off for 767 lower hold
  • Suitable for: 767, 787 lower hold
  • Maximum gross weight: 2,449 kg (5,399 lb)
  • Tare weight: 83 kg (183 lb)
  • AS1825 volume: 5.5 m3 (194 ft3)

Demi Unit Load Device

ULD Demi Air Container
  • IATA ULD code: AYY contoured container on half pallet base.
  • Rate class: Type 7
  • Description: Half-width main deck container with top contour
  • Suitable for: 727F, 737F, 757F main deck, 747F, 767F, 777F, DC-10F, MD-11F main deck
  • Maximum gross weight: 3,016 kg (6,649 lb)
  • Tare weight: 80 kg (176 lb)
  • AS1825 volume: 5.8m3 (206ft3)

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