# NTSB SEA92LA149: Cessna 172L, N9871G, Delta, UT, July 11, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 11, 1992, 11:19 local (17:19 UTC)
- Place: Delta, UT
- Coordinates: 39.289596, -112.559616 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.2896&lon=-112.5596&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report August 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 42851
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA92LA149
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42851/pdf
- Page: https://openairdocs.org/ntsb/SEA92LA149

## Probable cause

THE FAILURE OF AN INTAKE VALVE AND THE POORLY EXECUTED FORCED LANDING.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, cruise - normal
  - engine assembly,valve,intake - failure,total (contributing factor)
- Forced landing, descent - emergency
- Overrun, landing - roll
  - weather condition - tailwind (contributing factor)
  - planned approach - poor, pilot in command (cause)
  - object - fence
  - object - other
- On ground/water collision with object, landing - roll

## Analysis

DURING A PLEASURE CROSS COUNTRY FLIGHT, THE AIRPLANE BEGAN TO SHAKE AND THE ENGINE RPM DECREASED. THE PILOT DIVERTED TO A NEARBY RUNWAY AND LANDED DOWNWIND. AFTER THE AIRPLANE TOUCHED DOWN, IT BOUNCED AND CONTINUED TO BOUNCE THE LENGTH OF THE RUNWAY.  THE AIRPLANE FINALLY SETTLED AS IT RAN OFF THE END OF THE RUNWAY AND CONTINUED TO TRAVEL THROUGH A BARBED WIRE FENCE AND BEEHIVE BOXES BEFORE COMING TO REST. POST-CRASH INSPECTION OF THE ENGINE REVEALED THAT THE NUMBER 4 INTAKE VALVE WAS BROKEN. DUE TO DAMAGE OF THE FRACTURE ENDS, THE FAILURE MODE WAS NOT DETERMINED.

## Aircraft

- Registration: [N9871G](https://openairdocs.org/deregistered/N9871G-2001-09-25), registration cancelled 2001-09-25, S/N 17259771 (OpenAirDocs)
- Reported make and model: CESSNA 172L
- Registry model: [Cessna 172L](https://openairdocs.org/model/cessna-172l) (registry code 2072432) (OpenAirDocs)
- Category: Airplane
- Serial number: 17259771
- Engines: LYCOMING O-320-E2D 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Carlson, Donald K.
- Registered owner: Carlson, Donald K.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, January 2, 1900
- Departed: U42, SALT LAKE CITY, UT
- Destination: CDC, CEDAR CITY, UT
- Flight plan: VFR
- Airport: DTA, Delta, runway 34, 6,011 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 17; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 92 total, 43 in this make and model, 28 as pilot in command, 9 in the last 90 days, 2 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: 8,000 ft overcast

## 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 19920711042999A](https://openairdocs.org/incident/19920711042999A), Jul 11, 1992: Cessna 172L, Delta, UT, Substantial damage. Lost power. Headed for airport but had to land downwind. Ran off departure end. NR4 cylinder intake valve broken.

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.

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