# Operation Factual - Attachment 21- ALPSC cast iron letter dated August 23, 2012

**Citation:** DCA14MP001 docket item 21  
**Type / status:** incident / current  
**Agency:** National Transportation Safety Board  
**Effective:** Not stated  
**Published:** Not stated

DCA14MP001; docket item 21; Adobe PDF file.

## Document text

Operation Factual - Attachment 21- ALPSC cast iron letter dated August 23, 2012 DCA14MP001 docket item 21. 4 pages. 0 photograph references. Published media type: Adobe PDF file. Metadata only; the linked docket file is not mirrored.

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/Docket/Document/docBLOB?ID=40439092&FileExtension=.PDF&FileName=Operation%20Factual%20-%20Attachment%2021-%20ALPSC%20cast%20iron%20letter%20dated%20August%2023,%202012-Master.PDF>
- Source ID: `ntsb-dockets`
- SHA-256: `4fae58f2b07aefc316a45cb1815d0768d20dfe739f2d2d7cd8c852d8d8ac649a`
- Retrieved: 2026-08-20T04:58:09.797Z
- Exported: 2026-08-24T09:24:54.580Z
- Document slug: `ntsb-docket-item-40439092`

### Source metadata

```json
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  "materialSubtype": "ntsb_docket_item_metadata",
  "ntsbNumber": "DCA14MP001",
  "blobId": "40439092",
  "ordinal": 21,
  "pages": 4,
  "photos": 0,
  "publishedMediaType": "Adobe PDF file",
  "fileExtension": ".PDF",
  "fileName": "Operation Factual - Attachment 21- ALPSC cast iron letter dated August 23, 2012-Master.PDF",
  "docketUrl": "https://data.ntsb.gov/Docket/?NTSBNumber=DCA14MP001",
  "tableOfContentsUrl": "https://data.ntsb.gov/Docket/TOCPrintable?data=88558",
  "docketReportedMode": "Pipeline",
  "docketCreationDate": "2014-01-27",
  "docketLastModifiedDate": "2018-09-11",
  "docketPublicReleaseDate": "2016-04-20",
  "metadataOnly": true,
  "binaryMirrored": false,
  "caveat": "Docket item metadata and official link only. The title does not establish authorship, evidentiary weight, NTSB endorsement, legal effect, or a current regulatory finding; party submissions and evidence binaries are not mirrored.",
  "jurisdiction": "US"
}
```