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).
Table detailing part failures on a Ph.III Bumper, the hours they ran, and the subsequent production improvements.
| Identifier | ExFiles\Box 119\2\ scan0410 | |
| Date | 10th January 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Les.3/KW.10.1.36. Failures on Ph.III Bumper. Part | Hours Run | Improvement in Production Part --- | --- | --- 2" CAMS. Front engine mounting,LeC.3954. | 46 hrs.45 m.{Mr Moon / Mr Moore} | Replaced by LeC.4462. Rear engine rubber became loose from steel parts | 117 hrs. | The rubber is moulded to steel parts. Filler end of petrol tank LeC.3949. | 447 hrs.30 m.{Mr Moon / Mr Moore} | Replaced by LeC.4715. 1/4" dia. bolts securing rear dam-per cross member to side members. | 77 hrs. | Increased to .312" dia. bolts. Salter's outer spring G.83271. | 56 hrs.40 m.{Mr Moon / Mr Moore} | Stress reduced 6% Salter's outer spring G.83271 | 143 hrs.25 m.{Mr Moon / Mr Moore} | Stress reduced 8% Top triangle lever | 48 hrs. + 4,000 miles | New lever, N.Sch.4634. | ||