What must a logistics support box standard cover at minimum?

Answer: Six groups: appearance, dimensions, sealing, drop, stacking, salt spray. The first five run every lot; salt spray quarterly.

How many units come from a lot of 800?

Answer: Code letter J, so 80 units; at AQL 2.5 five major defects pass, the sixth rejects.

Does a passing first article mean the lot passes?

Answer: No. It proves the process has not drifted; the lot is judged separately by sampling.

How many drops does the test require?

Answer: Ten from 1.2 m: one corner, three edges, six faces, plus a repeat pressure hold.

How long are records kept?

Answer: Five years for standard lots, seven for export, ten for type test reports.

Logistics Support Box Acceptance: Test Items and Decisions

Quick answer: A logistics support box standard works only as a decision table: six check groups, an AQL plan keyed to lot size, first-article control kept apart from lot judgement, and records that survive a claim.

Six inspection groups for a logistics support box
Turning AQL sampling into a batch decision
First article versus lot judgement
Setting drop and stacking parameters
Records and traceability retention
FAQ

1. Six inspection groups for a logistics support box

Most clauses say accept to drawing, which decides nothing. A workable standard answers four questions: what is checked, how, how many, what fails.

Item	Method	Sampling	Acceptance
Appearance and colour	Visual, colorimeter	20 per lot	ΔE 2.0 or less
Key dimensions	Caliper, gauge	5 per lot	Cavity ±1.2 mm
Sealing	Pressure hold	3 per lot	20 kPa, 60 s, decay 1.5 kPa
Drop	Loaded case	1 per lot	No crack at 1.2 m
Stacking	Top load	1 per lot	380 kg, 24 h, set 2 mm
Salt spray	Neutral fog	Quarterly	Creep 2 mm, 48 h

The split follows destructiveness: drop and stacking ruin the sample, so those units never ship, while appearance, dimensions and sealing allow a wider sample. Write ΔE 2.0, sink depth 0.3 mm, flash 0.5 mm, a 20 mm cap on a scratch.

2. Turning AQL sampling into a batch decision

Sampling follows GB/T 2828.1 at general level II, single sampling: critical AQL 0.65, major 2.5, minor 4.0, with zero acceptance on critical items.

Logistics Support Box: dark navy closed case on a grey wheeled trolley, two black latches and two side handles, steel racking aisle behind.

Lot size	Code	Sample	Major Ac/Re	Minor Ac/Re
151 to 280	G	32	2/3	3/4
281 to 500	H	50	3/4	5/6
501 to 1200	J	80	5/6	7/8
1201 to 3200	K	125	7/8	10/11

A lot of 800 logistics support boxes lands in the J band: 80 units, five major defects accepted, the sixth rejected. Those figures belong in the contract.

3. First article versus lot judgement

The first article is not the first unit moulded: it is the first three after every start-up, mould change and material change, checked, signed, filed separately and excluded from the sample, since its purpose is proving the process has not drifted.

Three rules cover the lot: one critical defect rejects it; majors above Ac reject it and tighten the next submission; three accepted lots restore normal inspection. Mixing the levels ends with a clean first-article sheet excusing a drifting lot.

4. Setting drop and stacking parameters

Drop exposes a structural weakness in an afternoon: load the case, drop it from 1.2 m in the sequence of one corner, three edges and six faces onto concrete, then judge no through crack, latches engaged, and a repeat 20 kPa hold. A shell intact over a hairline gasket crack still leaks.

Logistics Support Box: two olive-green cases open on a pallet, lid foam holding metal fittings, a gloved worker carrying a closed case.

Stacking applies 380 kg over the lid at 40 degrees Celsius for 24 hours, set held to 2 mm after an hour of recovery; record the temperature, since 35 degrees in summer and 15 in winter differ by a factor of two. Salt spray runs 48 hours at 5 per cent sodium chloride, creep held to 2 mm, and failures usually sit in latch springs.

5. Records and traceability retention

Records are written for a claim, not for an auditor: the inspection record, the nonconformity disposition, and the lot trace card carrying cavity number, resin batch, shift and inspector code.

Record	Medium	Retention	Signed by
Inspection record	Paper and scan	5 years	Inspector, QA
First article sheet	Paper	3 years	Line leader
Disposition sheet	System	5 years	QA lead
Lot trace card	System, marking	7 years, export	Production
Type test report	Electronic	10 years	Laboratory

Traceability runs both ways: from a cavity mark back to the shift record, from a disposition sheet forward to the serial range shipped. Three photographs of nameplate, latches and gasket face prevent most disputes.

Conclusion

A logistics support box standard turns acceptable into measurable acts: six groups define what is checked, the AQL plan how much, first article and lot judgement who signs. Written tightly it removes an argument on delivery day; written loosely, sampling is theatre. Fold the parts into one table and acceptance of a logistics support box has something to stand on.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.