Original equipment manufacturer (OEM) Gulfstream has called for G650ER operators to comply with a Rolls-Royce service bulletin regarding engine inspections.
The request, applying to all aircraft over 24 months old, follows two inflight incidents involving engine shutdowns that occurred within the space of one year.
Operators received a maintenance and operations (M&O) letter which specified the affected aircraft – serial numbers 6001 to 6254 – and said they “will be permitted one flight cycle to allow for the relocation of the aircraft” until they are verified as compliant with the Rolls-Royce bulletin, or Gulfstream bulletin which contains instructions on compliance with Rolls-Royce.
Investigations of the two incidents revealed the cause of the accidents was a high-friction condition within the HP compressor variable stator vane (VSV) mechanism, prompting Rolls-Royce to release a bulletin calling for immediate inspection and lubrication of the VSV mechanism.
“When the high-friction condition is present, excessive torque is required to move the VSV system, resulting in an electronic engine control-commanded shutdown,” said Gulfstream.
“We have decided it would be prudent to accelerate inspection and lubrication requirements for aircraft that have been in service for 24 months or more, starting from July 2019.”