# NTSB DEN87LA089: Cessna 152, N4970B, Bountiful, UT, April 8, 1987

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: April 7, 1987, 18:15 local (Apr 8, 1987, 00:15 UTC)
- Place: Bountiful, UT
- Coordinates: 40.879714, -111.819854 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.8797&lon=-111.8199&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report July 5, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 17195
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN87LA089
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17195/pdf
- Page: https://openairdocs.org/ntsb/DEN87LA089

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - nonmechanical, maneuvering
  - mixture - improper use of, pilot in command (cause)
- Forced landing, descent - emergency
  - object - aircraft moving on ground
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - none suitable

## Analysis

THE STUD PLT WAS PRACTICING STALLS ABOUT 10 N OF ARPT. DURING RECOVERY FROM A STALL THE ENG BEGAN TO RUN ROUGH. THE PLT SAID HE ADVANCED THROTTLE, APPLIED CARB HEAT, AND TRIED TO ADJUST MIXTURE. THE ENG CONTINUED TO RUN ROUGH AND LOSE PWR AND THE PLT RETURNED TO THE ARPT. THE ACFT WAS AT ABOUT 200 FT UPON ARRIVAL AT THE ARPT AND THE PLT ATTEMPTED TO ALIGN WITH RWY 16, WHICH WAS THE DOWNWIND RWY. UPON APPROACHING RWY 16 THE PLT NOTED ANOTHER ACFT LANDING IN THE OPPOSITE DIRECTION AND TURNED TO PARALLEL THE RWY. THE ACFT CONTINUED TO DESCEND DUE TO LOW PWR AND STALLED AND CRASHED FROM ABOUT 20 FT AGL NEAR MIDFIELD. EXAMINATION OF THE WRECKAGE REVEALED THAT THE MIXTURE CONTROL WAS NOT IN THE FULL IN POSITION. FURTHER EXAMINATION OF THE WRECKAGE AND A TEST RUN OF THE ENG DID NOT REVEAL EVIDENCE OF A PRE-ACCIDENT MECHANICAL FAILURE OR DEFICIENCY.

## Aircraft

- Registration: [N4970B](https://openairdocs.org/deregistered/N4970B-2013-04-02), registration cancelled 2013-04-02, S/N 15283731 (OpenAirDocs)
- Reported make and model: CESSNA 152
- Registry model: [Cessna 152](https://openairdocs.org/model/cessna-152) (registry code 2071835) (OpenAirDocs)
- Category: Airplane
- Serial number: 15283731
- Airframe hours: 4048
- Engines: LYCOMING O-235 110 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Skypark Aviation
- Registered owner: Hal B Young
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 2, 1987, 1 hours before
- Departed: BTF
- Airport: BTF, Salt Lake Skypark, runway 24, 4,700 × 60 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 21; student; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 21 total, 21 in this make and model, 6 as pilot in command, 21 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 5 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 55 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19870407008709A](https://openairdocs.org/incident/19870407008709A), Apr 7, 1987: Cessna 152, Bountiful, UT, Substantial damage. Solo students engine ran rough after stall practice at altitude. Stalled beside runway. Mixture control not full in

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.