# Boeing 727 aft airstair instruction placard

> Its fall point constrains the aircraft's position minutes before the jump; Nicholson's free-fall analysis uses it.

Source: https://mysteriesdept.com/mysteries/db-cooper/artifacts/ART0D6SXWB01EC0/boeing-727-aft-airstair-instruction-placard  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Mysteries](https://mysteriesdept.com/mysteries)[Hijacking of Northwest 305 (D. B. Cooper)](https://mysteriesdept.com/mysteries/db-cooper)[Artifacts](https://mysteriesdept.com/mysteries/db-cooper#artifacts)Boeing 727 aft airstair instruction placard

**ART** 0D6SXWB01EC0·Artifact · object

# Boeing 727 aft airstair instruction placard

ObjectFound by a deer hunter in 1978 about 13 miles east of Castle Rock

[Cite]

Its fall point constrains the aircraft's position minutes before the jump; Nicholson's free-fall analysis uses it.

## Copies 0

## Where it was made

[Placard find site east of Castle Rock](https://mysteriesdept.com/records/PLC0D6SWZH401KE/placard-find-site-east-of-castle-rock) · Forest

## Sources 1

- [D. B. Cooper](https://mysteriesdept.com/sources/SRC0D6SWREJ65CS/d-b-cooper)_SRC_

## Cite it

```
Mysteries Department. (2026). Boeing 727 aft airstair instruction placard [Artifact ART0D6SXWB01EC0]. https://mysteriesdept.com/r/ART0D6SXWB01EC0
```

Key

**ART** 0D6SXWB01EC0

Kind

Object

Held by

Federal Bureau of Investigation (evidence)

Dated

found by a deer hunter in 1978 about 13 miles east of Castle Rock

Place

[Placard find site east of Castle Rock](https://mysteriesdept.com/records/PLC0D6SWZH401KE/placard-find-site-east-of-castle-rock)

Part of

[Hijacking of Northwest 305 (D. B. Cooper)](https://mysteriesdept.com/mysteries/db-cooper)

The record

Every record is open data. Take this one as JSON, with its links and its history.

[JSON](https://mysteriesdept.com/api/v1/records/ART0D6SXWB01EC0)