This amendment includes a number of significant changes which are considered to represent the Initial step in the development of airworthiness requireraente more specifically applicable to tarblneimmrftti foansport category airplanes. These entail revisions to the flight, structural, and powerplant installationprcvislone" and in mat cases are generally applicable to transport category air planes, irrespective of the type of powerplant used. The most significant changes in the flight provisions

more »

... hich cater to turbine-powered airplanes deal with the establishment of limiting climb speeds for the all-engine-operating landing configuration in 8 Jib. 119 and for the one-engineinoperative approach configuration in 8 Ub.120. No limiting speeds are prescribed for these configu rations in the currently effective regulations. In view of toe fact that the beet climb speeds for jet-powered airplanes might be considerably higher than the operational landing speed, these changes are designed to assure a reasonable relationship between the climb speeds and the landing speed. Other revisions of the flight provisions include changes in the take-off speed requirements of I Ub.Hit, in the trim requirements of SI ijb.3lp. and lib.llt2, and in the stability requirements of 81 Itb.lSU and &.155. Among the changes in the structural requirements is a nev provision in 8 2tb.2l6 (a) which is More specifically applicable to turbine-propeller-powered airplanes. It prescribes taking into ac count the high torque which might occur from possible unwanted feathering of a propeller under full power. In addition there are other changes to the structural provisions vhich are generally applicable. These involve a requirement in new I lib.216 (d) which prescribes consideration of the unsymmetrieal tail loads which might be caused by propeller drag as a result of possible tine delay between engine failure and feathering of the propeller, a requirement in 8 lib.210 (b) (k) allowing the applicant to limit 7 c at altitudes where is limited by Mach number, and a requirement in I lib,231 (a) which pre scribes an investigation of the landing gear for leads resulting from the higher contact speeds at altitudes and daring downwind landings when the approval of landings above S,000 feet or landings in downvinds exceeding ID mph, respectively, is sought. there are included amendments witfa respect to the installation of smoke detectors In cargo com partments. The currently effective rules in Part lib require the installation of smoke detectors in cargo compartaaants "5", and "D". In addition, the currently effective provisions in tbe air carrier operating parts of the Civil Air Regulations require, on all passenger airplanes with engines of over 600 horsepower, the installation of smoke detectors in "B* and n C" compartments. On the other hand, pending further development of reliable smoke detectors, Special Civil Air Regulation So. SR-ljjOl permits noncompliance with the sstake detector provisions in Fart tin and in the operating parts of the regulations until April 1, 1956* This amendment revises 88 ljb.383 (b) (2), (c; (1) (i), and (d), so that beat-type fire detectors m*C be installed in lieu of smoke detectors in corapartajents »B" and "C and no detectors need be installed in compartments "3." Concurrently with this amendment, Parts hp, kl, and hZ are being amended so that heat-type fire detectors may be installed in lieu of smoke detectors in compartments "B" and n C." A number of significant changes are included in connection with the powerplant installations! re quirements for the purpose of making them more specifically applicable to turbine-powered airplanes. La this regard changes are made to Si ijb.if60, lib.ljSO, Lib.)j83, ljb.i}86, 2jb.l*88, and Ijb.iiPO. These changes entail several new provisions designed mainly for the protection against fire in turbine powerplant Installations. They include provisions against overflow of combustible fluids in the In duction system, provisions which specify the compressor and accessory section of the turbine engine as designated fire aones, and provisions making certain requirements of the presently effective regu lations for designated fire zones applicable to the combustion, turbine, and tail pipe sections. In addition, 8 l*b.6itf) is being amended to incorporate a comprehensive and detailed set of stand ards intended to provide protection in types of icing conditions liiich might be reasonably anticipated during normal operations. 66U G0W-BC-6UO95