Jet Airways B739 at Mumbai on Mar 3rd 2016, main gear collapse on taxiway

Last Update: February 26, 2018 / 15:10:42 GMT/Zulu time

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Incident Facts

Date of incident
Mar 3, 2016

Classification
Accident

Airline
Jet Airways

Flight number
9W-354

Departure
Delhi, India

Destination
Mumbai, India

Aircraft Registration
VT-JGD

Aircraft Type
Boeing 737-900

ICAO Type Designator
B739

A Jet Airways Boeing 737-900, registration VT-JGD performing flight 9W-354 from Delhi to Mumbai (India) with 120 passengers and 8 crew, had safely landed on Mumbai's runway 27 at 21:52L (16:22Z) and had vacated the runway via taxiway N9 (second last, about 2600 meters/8550 feet down the runway), when the right main gear collapsed. The aircraft became disabled sitting on its nose and left main gear and right hand engine pod with the tail still penetrating runway 27. There were no injuries, the aircraft sustained substantial damage.

The airline reported a technical fault with the landing gear after landing disabled the aircraft on taxiway N9 at 21:52L, recovery work was completed by 10:00L the following morning and the aircraft was towed to the Jet Airways hangar. India's DGCA have been informed about the event.

Runway 09/27 was closed while the aircraft was being removed, all traffic used runway 14/32 during that time.

On Mar 5th 2016 India's DGCA reported that first examination revealed a bolt connecting the trunnion link fractured causing the gear strut to puncture the right hand wing and the engine pod to settle on the ground. While vacating the runway the crew heard a thud, the aircraft tilted and the hydraulic system was lost.

On Feb 26th 2018 India's DGCA released their final report concluding the probable cause of the accident was:

The Committee of inquiry determined the cause of accident as “The RH ft landing ear trunnion pin failed due to base metal heat damage as a result of busive grinding f the chrome plate that likely occurred during the last overhaul”.

The DGCA analysed:

M/s Jet Airways B-737-900 aircraft VT-JGD flight 9W- 354 (Delhi -Mumbai) was involved in an accident at Mumbai Airport on 03-03-2016 at 1622 UTC. The landing was carried out by Co-pilot & PIC was carrying out SLF. The aircraft landed safely on Runway 27 and during landing roll, 16 seconds after touchdown, at speed 58 knots Right main landing gear aft trunnion pin broke and Right Main Landing Gear collapsed. The aircraft started deviating to the right of center line. Pilot tried to vacate runway via taxiway N9 using tiller but aircraft stopped on taxiway. There was damage to the RH landing gear and aircraft was resting on RH engine, Nose & LH landing Gear. Hydraulic fluid spillage occurred due to damage to RH main landing gear. Maximum G load recorded during landing was 1.44 G.

ATC observed sparks between Taxiway N 7 and N 8 when engine cowl was rubbing runway and informed Fire Station and Apron control. The CFT reached the aircraft and sprayed the foam fire Extinguisher on the No. 2 Engine & RH Landing gear area on spilled Hydraulic Fluid to prevent fire. The passengers disembarked from L1 door using passenger stairs.

After the accident, the failure investigation of Trunnion Pin was carried out at DGCA & NTSB, USA. The report reveals that that the RH trunnion pin failed due to base metal heat damage as a result of abusive grinding of the chrome plate that likely occurred during the last overhaul. The fracture originated in an area of un-tempered martinsite (UTM) on the outer diameter of the trunnion pin. The crack originated from intergranular separation, a result of hydrogen embrittlement during cadmium plate processing. The crack propagated by Transgranular fatigue mode with ductile separation at final fracture. Multiple cracks were found near the fracture origin.

...

The LH landing Gear Trunnion Pin Sl. No. 90827-0891 and RH landing Gear
Trunnion Pin Sl. No. E2430 of VT-JGD was overhauled on 11/07/2013 and issued with EASA Form -1. M/s ST Aerospace Solutions (Europe) A/S, Oslo was approved by FAA and EASA but not approved by DGCA India, under any regulation. Both the left and right pins were apparently processed at the same time.

After the accident, all the Ten (10) Trunnion Pins overhauled by M/s ST Aerospace Solutions (Europe) A/S, Oslo were send for failure investigation NTSB, USA. Earlier also, two (02) Aft Trunnion pins of VT-JGA involved in accident at Khajuraho were also sent to NTSB for failure Investigation. Both Pins of VT-JGA and three (03) Pins (VT-JGD & VTJGC) showed indications of possible base metal heat damage.

Metars:
VABB 031800Z 03008KT 290V080 3000 FU NSC 30/17 Q1014 NOSIG
VABB 031730Z 34009KT 3000 FU NSC 29/19 Q1014 NOSIG
VABB 031700Z 30006KT 3000 FU NSC 31/15 Q1014 NOSIG
VABB 031630Z 02003KT 3000 FU FEW100 32/15 Q1013 NOSIG
VABB 031600Z 23007KT 3000 FU FEW100 32/15 Q1013 NOSIG
VABB 031530Z 34007KT 3000 FU FEW100 32/15 Q1013 NOSIG
VABB 031500Z 08008KT 3000 FU FEW100 33/16 Q1013 NOSIG
VABB 031430Z 24009KT 3000 FU FEW100 34/16 Q1013 NOSIG
VABB 031400Z 22006KT 3000 FU FEW100 34/17 Q1012 NOSIG
VABB 031330Z 33007KT 3000 FU FEW100 34/17 Q1012 NOSIG
VABB 031300Z 33006KT 3000 FU FEW100 34/18 Q1011 NOSIG
Incident Facts

Date of incident
Mar 3, 2016

Classification
Accident

Airline
Jet Airways

Flight number
9W-354

Departure
Delhi, India

Destination
Mumbai, India

Aircraft Registration
VT-JGD

Aircraft Type
Boeing 737-900

ICAO Type Designator
B739

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