From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Recommending a change to the service interval for pressure oil filters based on field experience.
| Identifier | ExFiles\Box 135\3\ scan0150 | |
| Date | 9th June 1937 | |
| By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} Hd.{Mr Hayward/Mr Huddy} c. Hs.{Lord Ernest Hives - Chair} c. E.{Mr Elliott - Chief Engineer} 1139 P.III - PRESSURE OIL FILTERS. Rm{William Robotham - Chief Engineer}15/R.9.6.37. Experience gained on 35-EX in France has shown that the pressure oil filter can be completely sludged up in 9,000 miles. In the Instruction Book 10,000 miles is laid down as the period between attention. Will Hy.{Tom Haldenby - Plant Engineer} please modify the Instruction Book to read "After the first 1000 miles, and subsequently every 5000 miles", and will Hd.{Mr Hayward/Mr Huddy} please notify Depots accordingly. Rm.{William Robotham - Chief Engineer} | ||