# OPERATIONS - INTEGRITY MANAGEMENT ATTACHMENT \#37 - CLOSE-INTERVAL SURVEY EXCERPTS, 2016 AND 2021

**Citation:** PLD21FR003 docket item 53  
**Type / status:** incident / current  
**Agency:** National Transportation Safety Board  
**Effective:** Not stated  
**Published:** Not stated

PLD21FR003; docket item 53; Text/Image.

## Document text

OPERATIONS - INTEGRITY MANAGEMENT ATTACHMENT #37 - CLOSE-INTERVAL SURVEY EXCERPTS, 2016 AND 2021 PLD21FR003 docket item 53. 52 pages. 0 photograph references. Published media type: Text/Image. Metadata only; the linked docket file is not mirrored.

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/Docket/Document/docBLOB?ID=14229381&FileExtension=pdf&FileName=Ops-IM%2037%20-%20Close-Interval%20Survey%20Excerpts,%202016%20and%202021_redacted-Rel.pdf>
- Source ID: `ntsb-dockets`
- SHA-256: `3fcd46869561e2fcf75dc11fdd93571789a16d2e07b5673d67671a9bebc4d252`
- Retrieved: 2026-08-20T04:58:09.797Z
- Exported: 2026-08-22T22:02:58.028Z
- Document slug: `ntsb-docket-item-14229381`

### Source metadata

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  "docketCreationDate": "2021-09-20",
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```