# NTSB Accident DEN99TA013
> **Air Tractor AT-400** · 1998-10-19 · AZTEC, NM, USA · NONE
## Event
- **NTSB number:** DEN99TA013
- **Event ID:** 20001211X11249
- **Type:** Accident
- **Date:** 1998-10-19
- **Location:** AZTEC, NM, USA
- **Coordinates:** 36.81916, -108.000526
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Air Tractor
- **Model:** AT-400
- **Registration:** N73080
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's inadequate preflight inspection of the airplane.  Factors were the unsecured oil dipstick, the loss of engine oil pressure necessitating a precautionary landing on unsuitable terrain, and the collision with the tree.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN99TA013) · AI Analytics · CC0 1.0*