Wings Abadi AT72 at Surabaya on Jun 11th 2014, aircraft being "hammered" during landing roll

Last Update: October 12, 2018 / 15:48:10 GMT/Zulu time

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Incident Facts

Date of incident
Jun 11, 2014

Classification
Report

Airline
Wings Air

Flight number
IW-1861

Departure
Lombok, Indonesia

Destination
Surabaya, Indonesia

Aircraft Registration
PK-WGK

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

A Wings Abadi Airlines Avions de Transport Regional ATR-72-212A, registration PK-WGK performing flight IW-1861 from Lombok to Surabaya (Indonesia) with 55 passengers and 4 crew, landed on Surabaya's runway 10. During roll out the crew heard some sound of impact, but no abnormal indications. The crew told the tower shortly afterwards they had seen drilling equipment and cable near the runway center line. The aircraft taxied to the apron, where eight holes were found in the fuselage amounting to substantial damage.

Indonesia's KNKT (also known as NTSC) released their final report concluding the probable causes of the accident were:

- The runway inspection that was performed while the runway maintenance has not been finished resulted in the object which were on dark color and found on dark surface did not properly inspect.

- The insufficient information regarding the objects and the location might have made improper assessment to the consequences of the runway operation and delaying the object removal.

The KNKT reported runway maintenance started at 01:00L that morning with the intention of repairing 7 locations on the runway. Works started at the threshold runway 10 and continued to the 7th location near taxiway N3.

At 04:05L the local airport rescue and fire fighting ARFF) personnel performed and concluded the morning runway inspection.

At 04:30L the runway maintenance team informed tower the runway was clear except for the portion near N3 where they were still working.

At 04:50L the maintenance team reported they were ready and the runway was clear.

At 05:00L operations commenced.

The KNKT then reported:

At 0500 LT, the airport operation initiated. At 0508 LT, the first aircraft (Airbus A320) landed from Jakarta.

Between 0517 LT until 0606 LT, 11 aircraft departed from runway 10 and there was no pilot report regarding to the object on the runway. At 0520 LT, the sweeper vehicle driver requested to controller to cross the runway and no report of object on runway.

At 0609 LT, a Boeing B737-900ER landed and the pilot reported several objects looked like cable and drilling equipment at the intersection taxiway N5 and was acknowledged by the ATC controller. This was the first pilot report of object.

At 0615 LT, the controller contacted the Airport Facility Readiness personnel used handy talky radio but no reply, thereafter the controller contacted the ARFF personnel informed the pilot report of object on the runway and requested the ARFF personnel to check the existence of the reported object. The ARFF personnel acknowledged and deployed one vehicle to inspect the runway. When the ARFF vehicle arrived near the runway and the ARFF personnel requested clearance to enter the runway and the controller instructed to wait for three aircraft that were about to land.

Between 0613 LT to 0615 LT, two aircraft departed and no pilot report regarding the object on the runway.

At 0618 LT, a Boeing B737-900ER landed and reported to the controller that the objects were on the centerline of the runway just before exit taxiway N5 consisted of drilling equipment with long cable.

At 0619 LT, an Airbus A320 departed and the pilot did not report regarding the object on the runway.

An ATR 72-212A (600 version) aircraft, registered PK-WGK (the aircraft), was being operated by PT. Wings Abadi Airlines (Wings Air) on scheduled passenger flight, from Lombok International Airport (WADL) Lombok, to Juanda with flight number IW 1861. Total person on board was 59 persons, consisted of two pilots, two flight attendants and 55 passengers.

At 0620 LT, the IW 1861 landed on runway 10 at Juanda International Airport and instructed by Juanda Tower controller to exit via taxiway N5 then proceed to parking stand 22 on the apron. During landing roll, the flight crew heard impact noises and no abnormal indication on the cockpit instruments. Afterward the pilot informed to the Juanda Tower controller that they saw drilling equipment and cable near the runway center line. The pilot decided to continue taxi as instructed.

At 0622 LT, a CRJ 1000 landed and the pilot reported objects of big pieces of metal on the runway center line near the taxiway N5.

At 0623 LT, a Boeing B737-800NG landed, afterward the controller decided to close the runway operation by holding all departure and arrival aircraft to check the reported object on the runway. The controller instructed the ARFF personnel to enter and inspect the runway. The ARFF personnel found compressor hose (about 10 meters long), jack hammer (about 60 cm long) and chisel (about 4.5 kg) on the runway.

The KNKT analysed:

Between 0500 LT and 0606 LT, 11 aircraft departure and one arrival, no pilot reported the foreign object on the runway. The first pilot report of objects was near the intersection taxiway N5 and was made at 0609 LT which was after sunrise at 0559 LT. This indicated that the objects were not clearly visible during dark time.

The information provided by the pilot mentioned something looked like a cable with drilling equipment located about exit taxiway N5. The controller reconfirmed three times the position the reported objects and was answered that the position was about exit of taxiway N5. The second report made by a pilot of the landing aircraft at 0618 LT, reported the object in similar way without mentioning the exact position and detail description of the object.

This information provided by the pilots did not clearly describe the objects such as estimated size or weight, material and the exact position. The position reported by the pilots did not clearly describe the exact position of the object compared to the position of the objects found by ARFF personnel. The insufficient information might have made the controller considered that the consequences of the reported object to the runway operation was less severe and decided to continue the runway operation.

Since the beginning of the operation of the airport until the occurrence, 15 aircraft departed and no pilot report related to the object on the runway and all aircraft safely departure. This condition might develop sense to the controller that the runway was safe for the operation. Refer to the position of the objects found on the runway, which were approximately 1,800 meters from the beginning runway 10, it is most likely that aircraft would had been lift off and the objects were not affecting departure aircraft.

The controller requested ARFF to check the reported objects and when the ARFF personnel arrived to the site, the controller instructed to hold and wait for three aircraft to land. This instruction indicated that the controller did not aware of the actual consequences of the reported object that might be caused by the incomplete information. While the ARFF personnel waiting to enter the runway, the Wings Air 1861 landed and struck the object.

The AC 170-02 stated that after the controller receive information of existence of any obstruction on or in close proximity to the runway likely to impair the safety of an aircraft taking off or landing, appropriate action shall be taken which might be cancelling takeoff or landing clearance and inform the location of the in relation to the runway.

Thereafter, a pilot of landing aircraft reported big piece of metal on the runway centerline, on the intersection of the runway and taxiway N5. This information contained significant information of the size and material of the object also more precise position. Afterward the ARFF approved to enter the runway and removed the objects.

Sufficient information is required to be able to access the consequences of the existing hazard. The pilot provided information of hazard that might be insufficient to determine the consequences of the hazard. This insufficient information was not clarified to get adequate information to make proper decision.

The insufficient information resulted in the assessment of the consequences of the hazard was less severe and kept the runway operation. The ARFF personnel was instructed to hold was also caused by the result of the hazard assessment.

The insufficient information might lead to incorrect assessment to the hazard and resulted in keeping the runway for operation and the delayed on removing the object from the active runway.
Incident Facts

Date of incident
Jun 11, 2014

Classification
Report

Airline
Wings Air

Flight number
IW-1861

Departure
Lombok, Indonesia

Destination
Surabaya, Indonesia

Aircraft Registration
PK-WGK

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

This article is published under license from Avherald.com. © of text by Avherald.com.
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