AeroContractors B734 at Lagos on Jul 21st 2015, burst tyre on takeoff
Last Update: October 23, 2018 / 13:58:20 GMT/Zulu time
Incident Facts
Date of incident
Jul 21, 2015
Classification
Incident
Airline
AeroContractors
Flight number
AJ-127
Departure
Lagos, Nigeria
Destination
Abuja, Nigeria
Aircraft Registration
5N-BOB
Aircraft Type
Boeing 737-400
ICAO Type Designator
B734
Nigeria's Civil Aviation Authority reported the aircraft developed a technical problem necessitating the air return which was performed in compliance with standard operating procedures.
On Oct 23rd 2018 Nigeria's AAIB released their final report concluding the probable causes of the serious incident were:
The cause of the serious incident could not be conclusively determined. However, the investigation identified the following factors:
- The condition of the runway as reported by landing aircraft prior to the occurrence, revealed cracks and potholes.
- The reported crack abeam Link 4 of runway 18L was the site of tyre debris after the departure of NIG127 (5N-BOB).
The AAIB detailed the damage:
The aircraft sustained substantial damage to the following;
- RH Landing Gear Door,
- RH Inboard Ground Spoiler which severed into two pieces (with a piece that flew off in flight),
- No 4 Main Wheel Tyre,
- Wheel well doors,
- A deep dent on the Right Horizontal Stabilizer leading edge, and,
- Multiple dents on the skin of the Right Vertical Stabilizer.
The AAIB reported: "The investigation revealed that No.4 Main Wheel change had been carried out prior to the incident flight."
The AAIB analysed:
The aircraft was granted taxi and take-off clearance by ATC. The take-off roll and takeoff were conducted without any observation or report of an abnormal condition either by the crew or ATC. During climb out and on reaching FL060, a passenger called the attention of the cabin crew to an observation that a portion of the right wing was missing. This prompted the Captain to instruct the first officer to confirm the observation. The missing portion of the wing was identified by the first officer to be a section of the ground spoiler. Thereafter, the decision to make an air return was made. The No. 4 main wheel tyre was found damaged upon inspection, after the aircraft landed.
The damage to the ground spoiler and other parts of the aircraft may have been caused by impact from fragments of rubber from the blown tyre.
...
The crew did not report any malfunction of the landing gear either during retraction on take-off, or on extension for landing after the air return.
With respect to the aerodrome the AAIB analysed:
According to the Tower Watch Log, runway 18L was closed at 14:06hrs on the day of the occurrence due to operational reasons. A crack had been reported abeam Link 4 of the runway and NAMA officials were assigned to access the crack and pothole. The runway was subsequently reopened at 14:55hrs.
At 15:20hrs, 5N-BOB departed from runway 18L, after which the runway was closed again due to a report by a Medview aircraft with registration 5N-MAB that was cleared and landed on the same runway, of tyre debris on the runway. The tyre debris according to the report were located abeam Link 4 of runway 18L. This is also the area at which a crack was reported, and for which the runway had been initially closed.
5N-BOB was the first aircraft cleared to use runway 18L after the inspection of the reported crack at Link 4. It can be reasonably deduced that the tyre debris found on the runway afterwards came from the aircraft, and hence the No. 4 main wheel had sustained damage during the taxi or take-off roll.
Incident Facts
Date of incident
Jul 21, 2015
Classification
Incident
Airline
AeroContractors
Flight number
AJ-127
Departure
Lagos, Nigeria
Destination
Abuja, Nigeria
Aircraft Registration
5N-BOB
Aircraft Type
Boeing 737-400
ICAO Type Designator
B734
This article is published under license from Avherald.com. © of text by Avherald.com.
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