Sir - I feel that an amendment may be appropriate to the letter from Steve Kirby, "Engines should be treated separately" (Flight International, 14-20 August, P40), about conducting simultaneous maintenance on both engines of a twin without a test before flight.

The cause of the Lockheed L-1011 TriStar's loss of oil from all three engines was attributed to seals not being fitted to the magnetic chip plugs. The plugs must have been fitted correctly, because, if they were not, the failsafe drain valve would have closed off in all three instances.


RAF Aldergrove

Source: Flight International