Omni B763 at Bucharest on Aug 28th 2020, left main gear collapse on landing

Last Update: September 2, 2021 / 15:30:41 GMT/Zulu time

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Incident Facts

Date of incident
Aug 28, 2020

Classification
Accident

Flight number
OY-703

Aircraft Registration
N423AX

Aircraft Type
Boeing 767-300

ICAO Type Designator
B763

Airport ICAO Code
LRBS

An Omni Air Boeing 767-300, registration N423AX performing flight OY-703 from Kabul (Afghanistan) to Bucharest Baneasa (Romania) with 49 passengers and 15 crew, landed on Baneasa Airport's runway 07 with all gear struts down at 14:53L (11:53Z) and locked but about two seconds after smooth touchdown suffered the collapse of the left main gear. The aircraft skidded along the runway on its right main gear, aft belly and left engine cowl, nose gear lifted off the ground again, to a stop on the center line of the runway. The aircraft was evacuated via slides. No injuries are being reported.

The aircraft was supposed to continue on to the USA following the stop in Bucharest to refuel.

Romania's AIAS (Civil Aviation Safety Investigation and Analysis Authority) reported the left main gear failed during roll out. AIAS have appointed an investigation commission. A preliminary report can be expected in 30 days.

The airport remained closed until Sep 3rd 2020 until the aircraft could be moved off the runway.

The Aviation Herald learned the aircraft sustained an upper strut body fracture.

On Sep 28th 2020 Romania's AIAS released their preliminary report in Romanian (the English version became available on Oct 1st 2020) reporting the crew consisted of captain (64, ATPL, 17,858 hours total, 5,463 hours on type) being pilot monitoring, a first officer (58, ATPL, 8,838 hours total, 718 hours on type) being pilot flying. An augmenting captain and first officer as well as 11 flight attendants completed the crew.

The aircraft performed an ILS approach to runway 07, all checklists were processed, the approach was stabilized, a "normal positive runway contact" (touchdown) at +1.6G occurred in the touch down zone. Shortly after touchdown the left main gear failed and the aircraft continued on the left engine. Upon failure of the left main gear the crew received an unsafe left main gear indication following by a left engine fire warning. The crew shut the left engine down and activated the fire suppression system, the fire indication ceased. After the aircraft came to a stand still, the commander ordered the evacuation of the aircraft via the right hand doors. As result of the evacuation a flight attendant suffered a minor abrasion as result of rubbing a hand with the surface of slide.

The aircraft had accumulated 71,418 flying hours in 14,811 flight cycles.

FDR und CVR have been successfully downloaded.

On Sep 2nd 2021 the AIAS released an interim notification stating the investigation is continuing. The outer cylinder of the left main gear had undergone a thorough metallographic examination at the Boeing headquarters in Seattle and stated: "Preliminary results showed that the characteristics of the breaking surface are consistent with a mechanism for initiating deterioration of the base material due to its overheating, followed by a hydrogen assisted cracking propagation mechanism. The examinations identified, in the areas adjacent to the rupture zone, numerous damages of the base metal under the chromium layer. The expertise report of the outer cylinder of the landing gear is being drafted. At present, the investigation continues with the analysis of the procedures and processing processes applied to the outer cylinder during the last overhaul of the landing gear."

Related NOTAM:
A2956/20 NOTAMN
Q) LRBB/QMRLC/IV/NBO/A /000/999/4430N02606E005
A) LRBS B) 2008281300 C) 2008291300
E) RWY 07/25 CLSD.

Metars:
LRBS 281300Z VRB04KT CAVOK 31/08 Q1011 NOSIG=
LRBS 281230Z VRB02KT CAVOK 31/08 Q1012 NOSIG=
LRBS 281200Z 04005KT 360V090 CAVOK 31/08 Q1012 NOSIG=
LRBS 281130Z 08004KT 020V160 CAVOK 31/08 Q1012 NOSIG=
LRBS 281100Z 18003KT 100V230 CAVOK 31/09 Q1012 NOSIG=
COR LRBS 281030Z VRB03KT CAVOK 30/11 Q1012 NOSIG=
LRBS 281000Z VRB03KT CAVOK 30/11 Q1013 NOSIG=
COR LRBS 280930Z 10006KT 040V140 CAVOK 28/11 Q1013 NOSIG=
COR LRBS 280900Z VRB03KT CAVOK 28/11 Q1013 NOSIG=
LRBS 280830Z 04005KT 350V160 CAVOK 28/11 Q1013 NOSIG=
Incident Facts

Date of incident
Aug 28, 2020

Classification
Accident

Flight number
OY-703

Aircraft Registration
N423AX

Aircraft Type
Boeing 767-300

ICAO Type Designator
B763

Airport ICAO Code
LRBS

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