Jet2 B733 at Leeds on Aug 2nd 2013, electrical failure and burning smell
Last Update: August 14, 2014 / 15:15:20 GMT/Zulu time
Incident Facts
Date of incident
Aug 2, 2013
Classification
Report
Airline
Jet2.com
Flight number
LS-201
Departure
Leeds, United Kingdom
Destination
Amsterdam, Netherlands
Aircraft Registration
G-CELF
Aircraft Type
Boeing 737-300
ICAO Type Designator
B733
The AAIB released their bulletin stating that maintenance found the "the red phase ‘A’ ground cable from the No 1 generator had separated from the T191 stud on the side of the No 1 engine. This cable had separated due to a failure of its terminal lug. Further examination of the generator harness revealed a cracked terminal lug on the blue phase ‘C’ ground cable at the T191 stud and a further cracked terminal lug at the firewall end of the grey ground cable. The crack on the blue phase ‘C’ lug was only visible after the heatshrink insulation was removed."
The left hand generator harness had not undergone maintenace since last overhaul in 2008. During that overhaul the harness, taken from another engine, had been moved onto G-CELF.
The lug of the fractured cable had suffered from fatigue causing cracks to develop.
The AAIB analysed: "The initial loss of the AT was recognised by the commander who was aware that it was not a ‘no go’ item in the Minimum Equipment List (MEL) and expected to continue the flight. As his instruments and other services failed, he realised that there had been a significant electrical failure although he did not recognise the situation as one which was covered in the abnormal checklist. The PF continued to fly the aircraft, using his instruments, and ATC were notified of the situation. The crew agreed that there was no abnormal procedure for their circumstances and that they should return to Leeds Bradford Airport. At that stage, there was no urgency to return and the Standard Operating Procedures (SOPs) regarding briefing the cabin crew were carried out as normal. When the SSC made the commander aware of the burning smell, the flight crew decided to expedite their return and transmitted a PAN call. From his training background, the commander knew that 140 kt was a safe approach speed and would not be runway limiting. When the No 1 generator tripped offline, the commander carried out the abnormal procedure and the FMC became available, enabling the appropriate approach speed to be obtained."
With respect to the failure of the lugs the AAIB analysed: "The red phase ‘A’ ground cable terminal lug failed due to corrosion fatigue under the influence of loads consistent with high frequency vibrations. The blue phase ‘C’ terminal lug and the grey ground terminal lug had started to crack in the same manner and would probably have failed eventually as well. This engine had been subject to higher than normal vibration in the month preceding the failures, which was probably a contributory factor."
Incident Facts
Date of incident
Aug 2, 2013
Classification
Report
Airline
Jet2.com
Flight number
LS-201
Departure
Leeds, United Kingdom
Destination
Amsterdam, Netherlands
Aircraft Registration
G-CELF
Aircraft Type
Boeing 737-300
ICAO Type Designator
B733
This article is published under license from Avherald.com. © of text by Avherald.com.
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