Jet Airways B738 at Khajuraho on Apr 13th 2015, gear collapse on landing

Last Update: February 5, 2018 / 17:41:58 GMT/Zulu time

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Incident Facts

Date of incident
Apr 13, 2015

Classification
Accident

Airline
Jet Airways

Flight number
9W-2423

Departure
Varanasi, India

Destination
Khajuraho, India

Aircraft Registration
VT-JGA

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

A Jet Airways Boeing 737-800, registration VT-JGA performing flight 9W-2423 from Varanasi to Khajuraho (India) with 59 passengers and 8 crew, landed on Khajuraho's runway 19 at 13:16L (07:46Z). During the roll out the left main gear collapsed, the aircraft came to a stop on the runway about 1200 meters down the runway resting on right main gear, left engine and nose gear. The passengers were evacuated via slides. There are no injuries being reported, the aircraft received substantial damage.

Khajuraho Airport is estimated to remain closed for 48 hours (no NOTAM available so far).

Ground observers reported a hydraulic leak, a blown tyre and the collapse of the left main gear (sequence unclear).

The airline confirmed a technical problem with the landing gear after landing of flight 9W-2423 at Khajuraho, the passengers evacuated safely via slides.

India's DGCA have opened an investigation into the accident.

No weather (neither Metars nor local weather station) data are available.

On Feb 2nd 2018 India's DGCA released their final report concluding the probable causes of the accident were:

The LH Aft landing Gear trunnion pin failed due to overload following fatigue growth. Crack initiation was in the heat affected area where excessive grinding was done at the time of overhaul. Initial crack growth is charterized by intergranular cracking (assisted by hydrogen embrittlement mechanism) until fatigue took over.

The DGCA wrote: "At touchdown aircraft pitch was 4.39 ¢X, vertical G 1.65 and touchdown speed was 120 kts (Vref ƒ{ 4kts). During landing Roll 15 seconds after touchdown at speed 36 knots left main landing gear aft trunnion pin broke and aircraft started deviating to the left of center line. The aircraft came to stop on runway with damage to the LH landing gear and resting on LH engine, Nose & RH landing Gear."

The DGCA reported that the NTSB conducted the examination and laboratory testing of the failed trunnion.

The landing gear had been overhauled in Oslo (Norway), the later failed trunnion was overhauled there on March 27th 2012. The overhaul facility has been approved by Danish Transport Authority, however, had not been approved by India's DGCA.

The DGCA analysed:

The LH landing Gear Trunnion Pin Sl. No. E2410 and RH landing Gear Trunnion Pin Sl. No. E2338 was overhauled on 27th March 2012 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 CAR -145.The overhaul process sheets of Trunnion Pin were send to NTSB and it was found that the appropriate procedures as outlined for the landing gear overhaul were carried out. Both the left and right pins were apparently processed at the same time. As per Jet Airways Quality Department Manual Chapter 2 credentials of the proposed vendor was evaluated through a desktop audit of documents supplied. However, the manual doesn¡¦t restrict to Jet Airways to carryout work at DGCA CAR-145 approved organization.

After the accident, the failure investigation of Trunnion Pin were carried out at DGCA & NTSB, USA. The report reveals that that the ¡§the LH trunnion pin has failed in fatigue originating from black strip which is probably a pre-existed crack¡¨. ¡§Chicken wire¡¨ cracking was observed over the entire chrome surface of the pin. The fractured aft trunnion pin contained an intergranular crack on the fracture face measuring 0.018 inch from the outer diameter (OD). Fatigue cracking was observed emanating 0.22 inch from the intergranular crack. Fracture initiation occurred by heat induced cracking which propagated during processing by a hydrogen embrittlement mechanism. Once in service, fatigue cracking initiated off of the existing crack until final fracture by ductile separation.
Incident Facts

Date of incident
Apr 13, 2015

Classification
Accident

Airline
Jet Airways

Flight number
9W-2423

Departure
Varanasi, India

Destination
Khajuraho, India

Aircraft Registration
VT-JGA

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

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