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NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

October 27, 1989 · Boeing 737-322 · N344UA

Rapid City, SD

Overview

Report Status

Probable Cause

Event Type

Incident

Date

October 27, 1989

Injury Outcomes

No injuries (40 uninjured)

Location

Rapid City, SD

Aircraft

Boeing 737-322

Tail Number

N344UA

Operator

United Airlines

Injuries

None

NTSB Number

DEN90IA016

WHILE CLIMBING THROUGH FLT LEVEL 280, THE FLT CREW DETECTED AN ODOR AND SOME SMOKE IN THE COCKPIT AND CABIN. THE CAPTAIN ELECTED TO RETURN TO THE DEPARTURE AIRPORT & HE LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL INSPECTED THE ACFT AND REPLACED SEVERAL AIR CONDITIONING SYSTEM TEMPERATURE SENSORS AND THE RECIRCULATING FAN ASSEMBLY. THESE ACTIONS CORRECTED THE PROBLEM AND THE ACFT WAS RETURNED TO SERVICE.

NTSB Probable Cause

THE INFLIGHT FAILURE OF THE RECIRCULATING FAN UNIT AND SEVERAL AIR DUCT TEMPERATURE LIMITING SENSORS.

Full Narrative

WHILE CLIMBING THROUGH FLT LEVEL 280, THE FLT CREW DETECTED AN ODOR AND SOME SMOKE IN THE COCKPIT AND CABIN. THE CAPTAIN ELECTED TO RETURN TO THE DEPARTURE AIRPORT & HE LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL INSPECTED THE ACFT AND REPLACED SEVERAL AIR CONDITIONING SYSTEM TEMPERATURE SENSORS AND THE RECIRCULATING FAN ASSEMBLY. THESE ACTIONS CORRECTED THE PROBLEM AND THE ACFT WAS RETURNED TO SERVICE.

Flight

Event TypeIncident

Event Time12:45 MDT

Nearest Airport0nm N

Runway0

Runway Length0

Runway Width0

Flight Plan FiledIFR

Aircraft FireNo

Aircraft ExplosionNo

Aircraft

AircraftBoeing 737-322

Tail NumberN344UA

Aircraft CategoryAir

OperatorUnited Airlines

Operating RulePart 121

Engines2

Engine TypeTurbofan

Engine DetailsGe · CFM56 · Turbofan · 20000

Seats149

People & Injuries

Injury SummaryNo injuries (40 uninjured)

Fatal0

Serious0

Minor0

Uninjured40

Total40

Crew 1Age 46 · First Class

Conditions

ConditionsVMC

LightDaylight

Wind180° @ 7 kt

Visibility50 sm

CeilingNone

Temperature / Dew Point59 / 28 C

Altimeter29.00 inHg

Observation Time17:50

Weather SourceWFAC

500 – Data service is offline

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October 27, 1989 · Boeing 737-322 · N344UA

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