76

This performance sheet would not require prior approval by the Civil Aviation Directorate. The operators would have a continuing responsibility, which they could not transfer to the Civil Aviation Directorate, of proving in any disputed case that a performance sheet had been correctly prepared for the flight in question. 237. In the particular case of the Sandringham, the rates of climb stipulated by 1.C.A.0., the United States, and the United Kingdom draft regulation given in Appendix G work out as follows : Rate of Climb with One Engine Inoperative (Stalling Speed, 73 Knots; Weight, 60,000 lb.) 1.C.A.0. Doc. 3031, AIR/181, para 282 f.p.m. at 5,000 feet in the 2.3.4.2.2 and U.S.A. C.A.R. 04b standard atmosphere. U.S.A. C.A.R. 04a .. .. 141 f.p.m. at 5,000 feet in the standard atmosphere. U.K. draft regulation .. .. 100 f.p.m. at 5,000 feet in the atmospheric conditions expected to obtain during the particular flight. The report of the Commission on the Sandringham (ZK-AME) incident (paragraph 6.32) records that in January, 1939, a density altitude at sea-level of 4,000 feet was recorded at Sydney, and this was accompanied by an air temperature of 45° c.* If in these atmospheric conditions the Sandringham were operated so that at 5,000 feet it had a rate of climb, with one engine inoperative, of 100 f.p.m., then in standard atmospheric conditions at 5,000 feet, the rate of climb would be 255 f.p.m. This is a close approximation to the 282 f.p.m. at 5,000 feet in the standard atmosphere stipulated in the draft 1.C.A.0. standards. 238. The figures for the Solent are 382 f.p.m. required by 1.C.A.0. at 5,000 feet in the standard atmosphere, corresponding to the Sandringham 282 f.p.m. The 8.0.A.C. Solents, which have been tested, have a rate of climb of 400 f.p.m. The Tasman Solents, not yet tested, will have a rather better performance because of their greater horsepower and improved design, and are expected to achieve about 450 f.p.m.

* At the time of the incident on 2nd December, 1947, the air temperature at 200 feet was 15° c.—that is, the temperature of the standard atmosphere.