# NTSB CHI90IA070: Boeing B737-300, N338UA, Cedar Rapids, IA, January 20, 1990

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: January 20, 1990, 07:10 local (13:10 UTC)
- Place: Cedar Rapids, IA
- Location: 41.8847° N, 91.7108° W: Placed by OpenAirDocs at THE EASTERN IOWA (CID), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8847&lon=-91.7108&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 72 uninjured
- Status: Completed, report May 10, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14563
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI90IA070
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14563/pdf
- Page: https://openairdocs.org/ntsb/CHI90IA070

## Probable cause

THE FAILURE OF ALL FOUR MAIN LANDING GEAR TIRES ON TAKEOFF DUE TO THE PARKING BRAKE BEING LOCKED.

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - roll/run
  - landing gear,parking brake - incorrect (contributing factor)
  - landing gear,parking brake - locked (cause)
  - landing gear,tire - failure,total (cause)

## Analysis

ALL FOUR MAIN LANDING GEAR TIRES FAILED DURING THE TAKEOFF ROLL JUST PRIOR TO ROTATION. THE PARKING BRAKE HAD BEEN SET ON THE ICY RUNWAY TO DO AN ENGINE RUNUP. THE CAPTAIN STATED HE HAD RELEASED THE BRAKES AT THE BEGINNING OF THE ROLL, AND THE COPILOT SAID HE HAD HEARD THE BRAKES RELEASE. HOWEVER, NEITHER PILOT HAD CHECKED TO SEE IF THE RED PARKING BRAKE LIGHT WAS ON. POST INCIDENT INSPECTION REVEALED BOTH THE CAPTAIN'S AND COPILOT'S PARKING BRAKE ACTUATION RIGGING TO BE OUT OF ADJUSTMENT.

## Aircraft

- Registration: [N338UA](https://openairdocs.org/deregistered/N338UA-2013-06-27), registration cancelled 2013-06-27, S/N 24242, built 1988 (OpenAirDocs)
- Reported make and model: BOEING B737-300
- Registry model: [Boeing 737-322](https://openairdocs.org/model/boeing-737-322) (registry code 138447Y) (OpenAirDocs)
- Registry engine: [CFM International CFM56 series](https://openairdocs.org/engine/cfm-international-cfm56-series) (registry code 13802, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 24242
- Engines: GE CF56 19000 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: United Airlines
- Registered owner: Unknown
- Airworthiness certificate: Standard, Transport
- Destination: DEN, DENVER, CO
- Flight plan: IFR
- Airport: CID, Cedar Rapids Muni, runway 9, 7,000 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport, flight engineer; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 300 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 80° at 9 knots
- Visibility: 5 statute miles
- Lowest ceiling: 3,200 ft overcast
- Temperature: 30 °F, dew point 27 °F
- Altimeter: 29.00 inHg
- Observed at: CID

## FAA reports on this event (1)

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

- [Incident 19900120005999I](https://openairdocs.org/incident/19900120005999I), Jan 20, 1990: Boeing 737322, Cedar Rapids, IA, Minor damage. Blew two tires on takeoff roll. Diverted to chicago. Landed without incident.

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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