Aviation safety investigations & reports

Runway overrun involving Fokker F100, VH-NHY Newman Airport, Western Australia, on 9 January 2020

Investigation number:
AO-2020-002
Status: Completed
Investigation completed
Phase: Final report: Dissemination Read more information on this investigation phase

Final report

Download Final report
[Download  PDF: 1.09MB]
 

What happened

On the morning of 9 January 2020, a Fokker 100 registered VH-NHY and operated by Network Aviation conducted a regular public transport service from Perth to Newman, Western Australia.

The weather forecast for Newman Airport included heavy rain, moderate to severe turbulence below 5,000 ft and a 25 kt crosswind. At the time the aircraft departed Perth, Newman Airport had received about 88 mm of rain since 0900 the previous morning.

After a stable approach, the aircraft touched down in moderate rain, at or before the touchdown zone, at a speed 16 kt above the reference landing speed for the configuration. The crosswind at the time was recorded as gusting to 35 kt. The flight crew experienced lower than expected braking performance and reported aquaplaning during the landing roll. The pilot flying used the aquaplaning response technique to maintain directional control and subsequently commanded maximum reverse thrust.

The aircraft stopped 70 m beyond the end of the runway inside the runway end safety area. There were no injuries to crew or passengers and an inspection of the aircraft found that the loose gravel had damaged some of the landing gear components

What the ATSB found

The combination of the approach speed required by the prevailing wind conditions and the poor braking effectiveness in the wet conditions resulted in the aircraft overrunning the runway.

The ATSB also found that despite assessing the weather as a threat, the flight crew did not identify the potential effect of the rainfall on the stopping distance. Additionally, neither the operator nor the regulator had guidance to allow the crew to recognise the conditions at the time as a hazard to the operation.

Prior to the occurrence, the runway had been examined and found to be requiring maintenance to ensure an adequate level of surface friction, however no maintenance was performed.  

What has been done as a result

Following the occurrence, the operator circulated additional guidance and procedures to flight crew for identifying runway water contamination and to ensure appropriate speed control on approach and landing.

Since the occurrence, the Civil Aviation Safety Authority has published guidance, reflecting research from the United States Federal Aviation Authority, that found landing on ungrooved runways in moderate rain has the potential to significantly affect braking performance.

Safety message

Active precipitation, particularly moderate to heavy rainfall, is one of many factors that can influence the stopping distance of an aircraft. Water on a runway that is not grooved can significantly reduce the ability of the aircraft to slow down. In wet weather, additional conservatism is encouraged when calculating the required landing distances.

Operators and pilots are encouraged to review the latest guidance and tools available in relation to maintaining safety on runways and the factors that cause runway overruns.

Download Final report
[Download  PDF: 1.09MB]
 
 
 

The occurrence

Context

Safety Analysis

Findings

Safety issues and actions

Sources and submissions

Glossary

Safety Issues

Go to AO-2020-002-SI-01 - Go to AO-2020-002-SI-02 -

Operator guidance

The operator's documentation required crew to consider contamination of runways at the departure and destination airports. However, the provided definition and guidance did not include the means to identify water contamination from active rainfall.

Safety issue details
Issue number: AO-2020-002-SI-01
Status: Closed – Adequately addressed

Regulator guidance

Civil Aviation Safety Authority (CASA) advisory publications did not include information regarding the potential for reduction in braking performance resulting from active rainfall.

Safety issue details
Issue number: AO-2020-002-SI-02
Status: Closed – Adequately addressed
General details
Date: 09 January 2020   Investigation status: Completed  
Time: 7:23 WST   Investigation level: Defined - click for an explanation of investigation levels  
Location   (show map): Newman Airport   Investigation phase: Final report: Dissemination  
State: Western Australia   Occurrence type: Runway excursion  
Release date: 01 September 2021   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Fokker B.V.  
Aircraft model F28 MK 0100  
Aircraft registration VH-NHY  
Serial number 11467  
Operator Network Aviation  
Type of operation Air Transport High Capacity  
Sector Jet  
Damage to aircraft Nil  
Departure point Perth Airport, Western Australia  
Destination Newman Aerodrome, Western Australia  
Last update 01 September 2021