Both documents passed review. Together they fail the machine.

This is a demonstration set built on an invented machine, the Kelfield Engineering HB40 horizontal baling press. The manufacturer, the machine and the personnel do not exist, which is why it can be shown to anyone. Eight findings were returned across three documents. All eight sit between documents.

Finding 03Critical

The machine that cannot pass its own health check.

Read these as a pair. Each was written by a competent author and cleared review on its own.

HB40-MM-002Revision 4

Maintenance manual, technical data

Platen force400 kN

System operating pressure250 bar

Reservoir capacity180 litres

Hydraulic fluidISO VG 46

Reviewed in isolation: passes

HB40-HC-004Revision 2

Health check guide, check 7 — system pressure

MethodCalibrated gauge at power pack test point

ConditionOperate into stall

Pass criterion230 bar ± 10

Reviewed in isolation: passes

Critical

A machine set correctly to the maintenance manual fails its own health check. An engineer who adjusts it to pass has set the relief valve twenty bar below stated operating pressure. Neither document is wrong. They are wrong together.

Finding 06Critical

The box on the record sheet that nothing fills.

The health check record sheet has fourteen lines. The guide has eleven checks. Line 12 asks the engineer to record accumulator pre-charge pressure.

There is no check for it, no method, no pass criterion, and no pre-charge figure anywhere in the set. The accumulator is the component the maintenance manual identifies as holding pressure after the pump stops. An engineer with a clipboard will put a number in that box.

This is the defect class that survives every review process built around single documents. The record sheet is correct. The guide is correct. The relationship between them was never anybody's job.

Mechanismhow they surface

A contradiction should be a query, not a discovery.

The findings above are not the product of careful reading. Every value, interval, term, hazard and compliance claim in the set is decomposed into a row carrying its source. Rows of the same kind sit in one table across the whole set, so two entries for the same parameter with different values are adjacent rows rather than a coincidence somebody has to notice.

Parameter register, extract three of eight findings

Parameter	Value	Source	Status
Platen force	400 kN	MM-002 §3	Clear
System operating pressure	250 bar	MM-002 §3	Critical
System pressure, acceptance	230 ± 10 bar	HC-004 Ck 7	Critical
Filter bowl torque	45 Nm	MM-002 §5.6	Clear
Interlock test interval	6 months	MM-002 §7	Major
Interlock test interval	12 months	HC-004 Ck 2	Major
Accumulator pre-charge	—	No source	Critical

Rows two and three are finding 03. Rows five and six are the same mechanism applied to an interval: the maintenance manual calls the interlock test six-monthly, the health check guide calls it annual. Row seven is finding 06, showing as an absence rather than a conflict.

Ruleswhat is run

Six rules, run across the whole set.

Same parameter, two values

Contradictory technical data anywhere in the set, including between a manual and a datasheet.

Record line with no check

A form demanding a result the guide never teaches, with no method and no pass criterion.

Undefined safety term

A term used in a safety instruction with no definition anywhere in the set.

Broken reference

A document number cited by one document and held by nobody.

Claim stated two ways

The same compliance claim worded differently across documents, or unevidenced entirely.

Citation past currency

Legislation or standards references superseded since the document was issued.

Critical

Blocks lawful placing on the market, or would not survive challenge after a claim.

Major

Defensible, but weak under challenge.

Minor

Housekeeping. Recorded, not urgent.

The other six findings in this set include a cross-reference to an installation manual that does not exist, a safe access position required before approaching a crushing hazard and defined nowhere, two different definitions of authorised engineer, two different product standards claimed across two documents, and a citation to the superseded Machinery Directive.

Send one product family. We will tell you what sits between the documents.

A non-disclosure agreement is in place before any technical material is received.

The manufacturer and the product family involved
Which documents exist, and which are referred to but not held
Whether this is pre-bind, renewal, a risk improvement condition, or a claim
Your timescale