# NTSB LAX83IA147: Douglas DC-9-10, N9356, Salt Lake City, UT, March 17, 1983

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: March 17, 1983, 00:00 local (07:00 UTC)
- Place: Salt Lake City, UT
- Coordinates: 40.750812, -111.900642 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.7508&lon=-111.9006&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 84 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 23583
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX83IA147
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23583/pdf
- Page: https://openairdocs.org/ntsb/LAX83IA147

## Sequence of events

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

- Loss of control - in flight, climb - to cruise
  - flight control system - frozen (cause)
  - weather condition - icing conditions (contributing factor)

## Analysis

DURING CLIMB TO 28,000 FT AT 20,000 FT THE AUTO-PILOT DISENGAGED AND THE CREW REPORTED THAT THEY COULD NOT MOVE THE CONTROL COLUMN TO CONTROL PITCH. THE ACFT WAS OPERATING IN ICING CONDITIONS AT THE TIME. THE CREW LANDED THE ACFT BY UTILIZING THE TRIM CONTROL.

## Aircraft

- Registration: N9356 (not matched to a registry record)
- Reported make and model: DOUGLAS DC-9-10
- Category: Airplane
- Serial number: 47086
- Engines: P&W JT8D 15000 lbs thrust turbo fan
- Damage: No damage
- Flight: Part 121
- Registered owner: Republic Airlines
- Airworthiness certificate: Standard, Transport
- Departed: SLC, SALT LAKE CITY, UT
- Destination: TWF, TWIN FALLS, ID
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 14,615 total, 7,615 in this make and model, 200 in the last 90 days, 7 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 300° at 6 knots
- Lowest ceiling: 1,100 ft broken
- Temperature: 36 °F
- Observed at: SLC, 45 nm away

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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