Trigana B733 at Jayapura on Feb 25th 2020, runway excursion on rejected takeoff

Last Update: August 3, 2020 / 15:01:41 GMT/Zulu time

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Incident Facts

Date of incident
Feb 25, 2020

Classification
Incident

Aircraft Registration
PK-YSG

Aircraft Type
Boeing 737-300

ICAO Type Designator
B733

A Trigana Air Service Boeing 737-300, registration PK-YSG performing freight flight IL-7341 from Jayapura to Wamena (Indonesia) with 4 crew and 16 tons of goods, was accelerating for takeoff from runway 30 when the crew rejected takeoff at high speed due to severe vibrations, the aircraft suddenly turned around about abeam taxiway D (about half way down the runway, 1585 meters from threshold runway 30, 1400 meters from end of runway 30). The aircraft had suffered damage to a nose wheel, the left main wheels rotated almost 90 degrees, the right main gear went off the paved surface. The aircraft was disabled on the runway. There were no injuries.

The crew reported they were taxiing to line up for departure.

Ground observers reported the occurrence happened shortly before takeoff, while it appeared to line up for departure it went off the runway.

The airport reported the aircraft was taxiing for departure when it went off runway 30. The airport was closed for about 5 hours until the aircraft could be moved off the runway.

Indonesia's KNKT opened an investigation.

On Aug 3rd 2020 Indonesia's KNKT released their preliminary report describing the sequence of events:

At 0722 LT, the Sentani Tower controller (Sentani controller) issued the push back and start clearances. Afterward the pilot conducted the aircraft push back while the engine start was conducted during the push back. After engine start completed, the pilots conducted the before taxi procedures and the PM requested taxi clearance to Sentani controller.

At 0725 LT, the taxi clearance was issued and the Sentani controller instructed the flight crew to taxi to runway 30 via taxiway NP and E. Subsequently the aircraft taxied normally and at 0726 LT the aircraft held on taxiway E waiting for another aircraft for takeoff.

At 0745 LT, the Sentani controller issued clearance to enter the runway 30 and the aircraft taxied backtrack to the beginning of runway 30.

At 0748 LT, the Sentani controller issued takeoff clearance and the departure clearance to continue on heading 270„a and initial altitude of 8,000 feet.

About 30 seconds after the takeoff clearance issued by the Sentani controller, the takeoff roll was initiated. About 2 seconds after the PM called the aircraft speed of 80 knots, the pilots felt aircraft vibration and became severe as the aircraft speed increased. The observation to the runway found that about 500 meters from the beginning runway 30, there were oscillated wheel marks of the main landing gear left and right on the runway.

When aircraft speed about 110 knots, the PF decided to reject the takeoff. The PF felt that the aircraft direction could not be controlled and the braking was ineffective.

As seen on the Closed-Circuit Television (CCTV) record, it shown that several seconds after rejected takeoff executed, the aircraft skidded longitudinally with the nose headed to the right. Thereafter, the aircraft veered to the right and continued until excursed from the runway. The aircraft still moving on the right of the runway shoulder with the nose headed on the runway heading. After crossed the taxiway D, the aircraft speed decreased while the aircraft was turning about 360 degrees. The aircraft stop on the right runway shoulder about 1,600 meters from the beginning of runway 30 on heading 270 degrees.

The KNKT reported the aircraft sustained substantial damage including damage to the left hand engine's fan blades, right hand engine's inlet cone, nose wheels fractured at the wheel hubs, all torsion links of the main landing gear fractured with the left hand main wheels pointing 90 degrees to the direction of movement of the aircraft, the left shimmy damper piston assembly had separated and was found on the runway about 1300 meters from the runway 30 threshold.

The KNKT reported the airline took an immediate safety action:

On 26 February 2020, Trigana issued the Engineering Instruction (EI) identified by number B737-EI/32/083R1 with the title DVI Main Landing Gear Shimmy Damper Bolt.

The Engineering Instruction contained instruction to inspect all B737 operated by Trigana in regard to the shimmy damper bolt.

Related NOTAMs:
B0587/20 NOTAMN
Q) WAAF/QMRLC/IV/NBO/A/000/999/0234S14031E005
A) WAJJ B) 2002242310 C) 2002250300 EST
E) RWY 12/30 CLSD DUE TO BLOCKED BY ACFT

B0587/20 NOTAMN
Q) WAAF/QMRLC/IV/NBO/A/000/999/0234S14031E005
A) WAJJ B) 2002242310 C) 2002250300 EST
E) RWY 12/30 CLSD DUE TO BLOCKED BY ACFT

B0588/20 NOTAMR B0587/20
Q) WAAF/QMRLC/IV/NBO/A/000/999/0234S14031E005
A) WAJJ B) 2002250153 C) 2002250600 EST
E) RWY 12/30 CLSD DUE TO BLOCKED BY ACFT

B0124/20 NOTAMN
Q) WAAF/QMXLC/IV/M/A/000/999/0234S14031E005
A) WAJJ B) 2001132000 C) 2004131100
E) TWY F CLSD DUE TO SURFACE DAMAGE

B6176/19 NOTAMR B4949/19
Q) WAAF/QLYAS/IV/M/A/000/999/0234S14031E005
A) WAJJ B) 1912190341 C) 2003191100
E) TWY LGT NP, D, E AND F U/S
Incident Facts

Date of incident
Feb 25, 2020

Classification
Incident

Aircraft Registration
PK-YSG

Aircraft Type
Boeing 737-300

ICAO Type Designator
B733

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