Electra B734 at Cologne and Tel Aviv on Jul 1st 2019, burst tyre on departure
Last Update: July 10, 2019 / 19:33:31 GMT/Zulu time
The occurrence aircraft was still on the ground in Tel Aviv about 24 hours after landing.
On Jul 10th 2019 Israel's AIAI released a safety event message in Hebrew advising the lead investigator is Germany's BFU. The AIAI performed investigations like interviews with the crew and a first assessment of the situation on request by the BFU.
The AIAI reported that during departure from Cologne's runway 32R the crew noticed noises and vibrations just prior to V1 however within limits, the crew continued takeoff, after becoming airborne the gear retracted normally and no adverse indications existed, the crew thus decided to continue. A subsequent runway inspection found debris on the runway distributed over a long distance. The debris was identified as the remains of two tyres as well as a gear door. The crew was informed about the findings but considered the damage to be minimal and decided to continue to Tel Aviv. Tel Aviv Airport prepared for a major emergency, about 100 emergency vehicles were dispatched to the aerodrome. Upon arriving in Israeli Airspace fighter aircraft inspected the aircraft and reported only the outboard left main tyre was damaged. The aircraft landed on Tel Aviv's runway 30.
Tyre #1, the damaged tyre, was a new one which had not been retreaded. Although the tyre showed some heat marks, the fuses had not opened and were intact. The tyre pressures in the other three tyres was intact at 200 psi.
The tyre was held by a wheel consisting of two flanges, that were assembled together by 16 screws and nuts. 6 of those screws were found fractured, all of them in sequence position 7 to 12. The other 10 screws were visually examined and then removed. 8 of the 10 nuts on those screws were found not suitable. The 6 fractured screws did not fail at once, the fracture surfaces suggest the screws failed one after the other, during the takeoff run at Cologne the last 2 of them fractured.
The flanges were checked and were found without any cracks.
The results suggest that no foreign object and no underpressure of the tyre contributed to the tyre damage. Israel's lead investigator believes due to the fractured 6 screws at the sector positions 7 to 12 and the high tyre pressure the two flanges separated temporarily releasing tyre pressure during the takeoff run. For further investigation the parts, the 6 failed as well as the 10 remaining screws and nuts have been sent to the BFU.
This article is published under license from Avherald.com. © of text by Avherald.com.
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