# DOCUMENTATION CHANGE IMPACT MATRIX Change Notice ECN-24017 · Product: Hydraulic Power Unit HPU-60 · Preliminary evidence-based review ## 1. Executive assessment The supplied descriptions establish several specific documentation impacts resulting from the return-line filter bracket change. The clearest impacts are the work instruction's installation parameters, the outdated bracket illustrations and part references, and the torque specification. Confirmed impact # 6 Documentation targets Potential impact # 2 Review candidates Unresolved # 1 Drawing revision These counts represent documentation targets in the matrix, not approved change actions or a count of documents requiring release. The central engineering change is: - Bracket: BRK-6012 Rev B → BRK-6048 Rev A; revised geometry. - Fasteners: four M8 × 30 bolts → two M10 × 30 bolts. - Tightening torque: 24 Nm → 42 Nm. - Filter housing: FLT-6007 remains unchanged; its interface is stated to be unchanged. - Reason: increase bracket stiffness and reduce installation hardware. The impact classifications below apply to the documentation content described in the input, not to final approval of any document revision. ## 2. Documentation Change Impact Matrix The evidence column identifies the supplied source and its relevant content. Evidence status is stated separately from impact status so that a supported relationship is not automatically treated as a confirmed impact. | CHANGE | AFFECTED COMPONENT | AFFECTED DOCUMENT | AFFECTED STEP/VISUAL | IMPACT STATUS | REQUIRED REVIEW | EVIDENCE | UNCERTAINTY | | ------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- | --------------------------------------------------- | -------------------------------------------------------------------------------- | ------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Bracket and installation hardware change: 4 × M8 × 30, 24 Nm → 2 × M10 × 30, 42 Nm | Return-line filter bracket; mounting fasteners | HPU-60 Assembly Work Instruction, WI-HPU-060 Rev 12 | Section 6, Step 6.4 — Return-Line Filter Installation | CONFIRMED IMPACT | Review the specified bolt size, quantity, length, and tightening torque against the new engineering information. Confirm that the procedure matches the revised bracket arrangement. | Supplied work-instruction description explicitly identifies four M8 bolts and 24 Nm. Supplied engineering change information specifies two M10 × 30 bolts and 42 Nm. Evidence status: SUPPORTED. | The actual work-instruction file and governing installation requirements were not supplied for independent inspection. Final wording and revision disposition remain for human review. | | Four-bolt bracket configuration replaced by two-bolt geometry | Return-line filter bracket | HPU-60 Assembly Work Instruction, WI-HPU-060 Rev 12 | Figure 18 | CONFIRMED IMPACT | Review the illustration for bracket geometry, mounting-hole arrangement, and depicted fastener count. Determine whether associated labels or callouts also require review. | Supplied documentation description states that Figure 18 shows the current four-bolt bracket. The change information specifies a revised two-bolt bracket. Evidence status: SUPPORTED by the supplied textual description. | The image itself was not available for independent visual inspection. Exact graphical discrepancies, callouts, and depiction details remain unverified. | | Bracket geometry and mounting arrangement revised | Return-line filter bracket | HPU-60 Service Manual, SM-HPU-060 Rev 7 | Chapter 4, Procedure 4.3 — Filter Replacement | POTENTIAL IMPACT | Review the procedure's bracket-related removal and installation instructions for assumptions that depend on the previous mounting arrangement. Verify whether fastener details, torque, or other installation directions are specified elsewhere in the procedure or referenced material. | The service procedure explicitly references the mounting bracket, and the engineering change modifies the bracket and its mounting hardware. The supplied summary does not show that Procedure 4.3 specifies the old bolt quantity or torque. Evidence status: PARTIALLY SUPPORTED. | The actual procedure text is unavailable. A generic bracket reference may remain valid; the need for a textual change is not established by the supplied description alone. | | Existing bracket illustration superseded by revised geometry | Return-line filter bracket | HPU-60 Service Manual, SM-HPU-060 Rev 7 | Chapter 4, Illustration 4-12 | CONFIRMED IMPACT | Review the depicted bracket configuration against the new bracket drawing and determine whether the illustration or associated annotations must change. | The supplied documentation description explicitly says Illustration 4-12 shows the existing bracket configuration. The engineering change specifies a revised bracket geometry. Evidence status: SUPPORTED by the supplied textual description. | The illustration itself was not provided for visual verification. Exact differences and the extent of redraw work remain undetermined. | | Bracket part number changes from BRK-6012 Rev B to BRK-6048 Rev A | Return-line filter bracket | HPU-60 Illustrated Parts Catalog, IPC-HPU-060 Rev 5 | Parts List 7 | CONFIRMED IMPACT | Review the bracket part-number entry, referenced revision or configuration information, and any dependent identification or ordering references supported by the catalog content. | Supplied catalog description identifies BRK-6012 in Parts List 7. The change information states that BRK-6048 Rev A replaces BRK-6012 Rev B. Evidence status: SUPPORTED. | The complete parts-list entry and any catalog-specific applicability rules were not supplied. Do not assume additional fields require change without inspecting them. | | Bracket configuration changes from four-bolt to two-bolt mounting | Return-line filter bracket and mounting fasteners | HPU-60 Illustrated Parts Catalog, IPC-HPU-060 Rev 5 | Figure 7-3 | CONFIRMED IMPACT | Review the figure for the bracket depicted, number and representation of mounting fasteners, and consistency with the revised parts-list entries. | Supplied catalog description states that Figure 7-3 depicts BRK-6012 and four mounting fasteners. The new engineering information identifies BRK-6048 and two M10 × 30 fasteners. Evidence status: SUPPORTED by the supplied textual description. | The actual figure was not available for independent inspection. The exact depiction, item balloons, and associated callouts remain unverified. | | Fastener specification changes from M8 to M10; torque changes from 24 Nm to 42 Nm | Return-line filter mounting fasteners | HPU-60 Torque Specification Sheet, TS-HPU-060 Rev 3 | Existing M8 fastener torque entry | CONFIRMED IMPACT | Review the existing 24 Nm entry and determine the appropriate treatment of the superseded specification. Verify the replacement value, fastener applicability, and any associated identification or cross-references against the authorized engineering source. | Supplied torque-sheet description identifies 24 Nm for the existing M8 fasteners. The change information specifies M10 × 30 fasteners and 42 Nm. Evidence status: SUPPORTED. | The full specification sheet was not provided. It is not established whether the entry is unique, referenced elsewhere, or subject to additional applicability conditions. | | Revised bracket geometry and mounting hardware may change the depicted assembly | Return-line filter bracket and return-line filter assembly | General Assembly Drawing, GA-HPU-060 Rev 19 | Return-line filter and bracket assembly view; exact view identifier not supplied | UNRESOLVED / CONFLICTING | Establish which GA revision is applicable to the change review. Inspect the relevant view in Rev 19, obtain and review the missing Rev 20, and determine whether the revised configuration is represented correctly. | Supplied description states that Rev 19 shows the filter and bracket assembly and that Rev 20 is not included. The engineering change modifies the bracket arrangement. Evidence status: INSUFFICIENT for determining the applicable drawing revision and the state represented in the current controlled drawing. | Rev 20 is missing from the review package. The separately listed “updated assembly drawing” has no supplied document identifier or revision, so it cannot be assumed to be GA-HPU-060 Rev 20. The unresolved classification is driven by revision applicability and missing evidence, not by a demonstrated contradiction between two inspected drawings. | | Bracket and mounting arrangement change may affect field-service instructions or references | Return-line filter assembly; exact bracket identity not established in the bulletin description | Field Service Bulletin, FSB-HPU-014 | Return-line filter assembly reference; exact section or figure not supplied | POTENTIAL IMPACT | Locate the assembly reference and review the surrounding bulletin content for reliance on the previous bracket geometry, mounting hardware, fastener quantity, or torque. Confirm whether the bulletin's purpose or instructions make the change relevant. | Supplied description states that the bulletin references the return-line filter assembly but does not identify the bracket part number. That establishes a plausible relationship to the changed assembly, but not that specific bulletin content is incorrect. Evidence status: PARTIALLY SUPPORTED. | No exact section, procedure, visual, or bracket-specific instruction is identified. The bulletin's applicability to the changed configuration is not established. | ## 3. Atomic change extraction and normalization | CHANGE ELEMENT | OLD STATE | NEW STATE | SOURCE BASIS | REVIEW INTERPRETATION | | ------------------------ | -------------------------- | --------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | | Bracket identity | BRK-6012 Rev B | BRK-6048 Rev A | ECN-24017 change summary; old/new engineering information; listed bracket drawings | Explicit part-number replacement. Requires review of documentation identifiers and depictions that identify the bracket. | | Bracket geometry | Existing four-bolt bracket | Revised two-bolt bracket geometry | ECN-24017 change description; listed old/new bracket drawings | Explicit configuration change. Relevant illustrations and installation content require the targeted reviews identified in the matrix. | | Fastener size | M8 | M10 | Old/new engineering information; revised fastener specification listed | Explicit fastener-size change. | | Fastener length | M8 × 30 | M10 × 30 | Old/new engineering information | Length remains 30 mm; the bolt size changes. Do not record this as a bolt-length change. | | Fastener quantity | 4 | 2 | Old/new engineering information | Explicit quantity reduction; relevant instructions and visuals must be reviewed. | | Tightening torque | 24 Nm | 42 Nm | Old/new engineering information; existing torque-sheet entry | Explicit torque change; the old specified value conflicts with the new specified value for the changed mounting arrangement. | | Filter housing identity | FLT-6007 | FLT-6007 | Old/new engineering information | Part number unchanged. | | Filter housing interface | Existing interface | Explicitly stated to be unchanged | New engineering information | No interface change is identified in the supplied summary. This does not prove that every housing-related documentation item is unaffected. | | Change rationale | Existing arrangement | Increased bracket stiffness and reduced installation hardware are the stated objectives | ECN-24017 change description | Context for the change; not independent proof that any additional documentation item is affected. | Normalization controls: Identifiers are retained as supplied, including their revisions. BRK-6012 Rev B and BRK-6048 Rev A are treated as distinct engineering identities. GA-HPU-060 Rev 19 is not merged with the separately mentioned, unidentified “updated assembly drawing.” FLT-6007 is treated as unchanged because that identity is explicitly provided for both states. ## 4. Coverage statement ### CASE COVERAGE = LIMITED Documentation content reviewed: The supplied textual descriptions for WI-HPU-060 Rev 12, SM-HPU-060 Rev 7, IPC-HPU-060 Rev 5, TS-HPU-060 Rev 3, GA-HPU-060 Rev 19, and FSB-HPU-014. Engineering evidence available in the request: The ECN-24017 change summary, old and new engineering information, stated bracket identities and revisions, the change rationale, and a list of supporting engineering materials. Material limitations: - The underlying drawing pages, illustration images, and separate engineering-source files were not included in the supplied message in a form available for independent inspection. Visual findings therefore rely on the supplied textual descriptions, not direct image verification. - GA-HPU-060 Rev 20 is explicitly absent. The applicable revision and the configuration actually depicted in the current drawing remain unresolved. - The separately listed updated assembly drawing and revised fastener specification have no supplied document identifiers and revision details sufficient to establish exact identity, current status, or equivalence to other listed sources. - Full document contents, cross-references, and any additional affected locations cannot be exhaustively searched from the excerpts alone. ### Treatment of the unchanged filter housing The engineering information expressly states that FLT-6007 and its interface remain unchanged. No separate housing-specific impact is asserted in the matrix because the supplied summaries do not establish complete coverage of all housing-related documentation content. The classification NO IMPACT IDENTIFIED IN SUPPLIED MATERIAL is not used for a documentation target. Given the limited coverage, doing so would imply a stronger negative finding than the available evidence supports. ## 5. Required review sequence The following order prioritizes explicit discrepancies before unresolved or potential relationships. 1. Resolve explicit installation discrepancies. Review WI-HPU-060 Rev 12, Step 6.4, Figure 18, and TS-HPU-060 Rev 3 against the authorized new fastener and torque information. 2. Resolve outdated component identification and depictions. Review IPC-HPU-060 Rev 5, Parts List 7 and Figure 7-3, together with SM-HPU-060 Rev 7, Illustration 4-12. 3. Inspect potential procedural impact. Examine SM-HPU-060 Rev 7, Procedure 4.3, to establish whether its actual instructions depend on the previous mounting arrangement. 4. Resolve drawing applicability. Obtain GA-HPU-060 Rev 20, identify the revision of the separately listed updated assembly drawing, and verify whether the relevant assembly view represents the new bracket configuration. 5. Establish bulletin applicability. Inspect FSB-HPU-014 to determine whether the bulletin's actual instructions, illustrations, or references depend on the superseded mounting arrangement. ## 6. Final validation | VALIDATION CHECK | RESULT | BASIS | | ------------------------------------------- | ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------ | | Material change elements considered | PASS | Bracket identity and geometry, fastener size, length and quantity, torque, and unchanged housing characteristics are recorded. | | Identifiers and revisions normalized | PASS | Supplied identifiers and revisions are preserved; no unsupported identity merging is used. | | Documentation relationships evidence-backed | PASS, within supplied summaries | Directly described relationships are distinguished from plausible relationships. | | Impact and evidence status separated | PASS | Confirmed and potential impacts are classified independently of evidence sufficiency. | | Confirmed impacts supported | PASS, subject to source descriptions | Confirmed findings rely on explicit document-content descriptions and the stated engineering change. | | Negative-finding coverage gate | PASS | No unsupported document-level no-impact finding is asserted. | | Visual verification | LIMITED | Actual figure and drawing files were not available for independent inspection. | | Revision applicability | UNRESOLVED | GA Rev 20 is missing, and the identity of the separately listed updated assembly drawing is not established. | | Final engineering/documentation approval | NOT PERFORMED | Outside the system's authority and scope. | ## VALIDATION STATUS = REQUIRES_HUMAN_REVIEW The matrix is suitable as a preliminary, traceable review aid based on the supplied text. Human validation remains necessary for drawing applicability, actual visual content, procedure-specific impact, and final review scope. No documents have been modified, approved, or released. Conclusion: The clearest downstream impacts concern the work instruction, parts catalog, service-manual illustration, and torque specification. The service-manual procedure and field service bulletin remain review candidates rather than confirmed changes. GA-HPU-060 requires revision-applicability resolution before its current-state impact can be reliably determined.